=====================================================
BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2330 [inline]
BUG: KMSAN: uninit-value in llc_fixup_skb net/llc/llc_input.c:134 [inline]
BUG: KMSAN: uninit-value in llc_rcv+0xf97/0x1290 net/llc/llc_input.c:180
CPU: 0 PID: 24857 Comm: syz-executor014 Not tainted 5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 pskb_may_pull include/linux/skbuff.h:2330 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0xf97/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in pskb_may_pull include/linux/skbuff.h:2332 [inline]
BUG: KMSAN: uninit-value in llc_fixup_skb net/llc/llc_input.c:134 [inline]
BUG: KMSAN: uninit-value in llc_rcv+0x1218/0x1290 net/llc/llc_input.c:180
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 pskb_may_pull include/linux/skbuff.h:2332 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x1218/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in __pskb_pull_tail+0x5d3/0x1e10 net/core/skbuff.c:2074
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 __pskb_pull_tail+0x5d3/0x1e10 net/core/skbuff.c:2074
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0x3f2/0x1530 mm/slub.c:4512
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 __kmalloc_node_track_caller+0x3f2/0x1530 mm/slub.c:4512
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x210/0x1ad0 net/core/skbuff.c:1638
 __pskb_pull_tail+0x167/0x1e10 net/core/skbuff.c:2075
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in fls64 arch/x86/include/asm/bitops.h:374 [inline]
BUG: KMSAN: uninit-value in get_order include/asm-generic/getorder.h:46 [inline]
BUG: KMSAN: uninit-value in kmalloc_large_node+0x231/0x2f0 mm/slub.c:4013
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 fls64 arch/x86/include/asm/bitops.h:374 [inline]
 get_order include/asm-generic/getorder.h:46 [inline]
 kmalloc_large_node+0x231/0x2f0 mm/slub.c:4013
 __kmalloc_node_track_caller+0x491/0x1530 mm/slub.c:4513
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x210/0x1ad0 net/core/skbuff.c:1638
 __pskb_pull_tail+0x167/0x1e10 net/core/skbuff.c:2075
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in fls64 arch/x86/include/asm/bitops.h:374 [inline]
BUG: KMSAN: uninit-value in get_order include/asm-generic/getorder.h:46 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node_track_caller+0x1407/0x1530 mm/slub.c:4516
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 fls64 arch/x86/include/asm/bitops.h:374 [inline]
 get_order include/asm-generic/getorder.h:46 [inline]
 __kmalloc_node_track_caller+0x1407/0x1530 mm/slub.c:4516
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x210/0x1ad0 net/core/skbuff.c:1638
 __pskb_pull_tail+0x167/0x1e10 net/core/skbuff.c:2075
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x124/0xdf0 net/core/skbuff.c:2210
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x124/0xdf0 net/core/skbuff.c:2210
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x74d/0xdf0 net/core/skbuff.c:2239
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x8fa/0xdf0 net/core/skbuff.c:2224
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 skb_copy_bits+0x703/0xdf0 net/core/skbuff.c:2228
 __pskb_pull_tail+0x38a/0x1e10 net/core/skbuff.c:2080
 pskb_may_pull include/linux/skbuff.h:2334 [inline]
 llc_fixup_skb net/llc/llc_input.c:134 [inline]
 llc_rcv+0x102d/0x1290 net/llc/llc_input.c:180
 __netif_receive_skb_one_core net/core/dev.c:5323 [inline]
 __netif_receive_skb net/core/dev.c:5437 [inline]
 netif_receive_skb_internal net/core/dev.c:5542 [inline]
 netif_receive_skb+0xe88/0xf30 net/core/dev.c:5601
 tun_rx_batched include/linux/skbuff.h:4357 [inline]
 tun_get_user+0x70eb/0x7470 drivers/net/tun.c:1902
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440109
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd6ac4a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ffdd6ac4a80 RCX: 0000000000440109
RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000007325c R09: 000000000007325c
R10: 000000000007325c R11: 0000000000000246 R12: 00000000000f4240
R13: 000000000007325c R14: 00007ffdd6ac4a6c R15: 00007ffdd6ac4a70

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xb42/0x1530 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2e5/0xaf0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1099 [inline]
 alloc_skb_with_frags+0x17f/0xa60 net/core/skbuff.c:5894
 sock_alloc_send_pskb+0xb86/0xd30 net/core/sock.c:2348
 tun_alloc_skb drivers/net/tun.c:1425 [inline]
 tun_get_user+0xe95/0x7470 drivers/net/tun.c:1741
 tun_chr_write_iter+0x34e/0x400 drivers/net/tun.c:1932
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x1508/0x1710 fs/read_write.c:605
 ksys_write+0x267/0x450 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:667
 __x64_sys_write+0x4a/0x70 fs/read_write.c:667
 do_syscall_64+0xa2/0x120 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================
=====================================================
BUG: KMSAN: uninit-value in skb_copy_bits+0x730/0xdf0 net/core/skbuff.c:2231
CPU: 0 PID: 24857 Comm: syz-executor014 Tainted: G    B             5.11.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118