=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
CPU: 0 PID: 32683 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:422
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0xc6/0xf0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 0010:kmsan_get_task_state+0xb/0x40 mm/kmsan/kmsan.c:59
Code: 5f 5d c3 8b bb 88 0c 00 00 e8 d1 16 00 00 e9 71 ff ff ff cc cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 65 8b 05 dd 5e c2 7d <a9> 00 01 ff 00 74 11 48 c7 c0 00 7b 02 00 65 48 03 05 17 07 c2 7d
RSP: 0018:ffff88802f8af1a0 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: 0000000120019ec4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888079d248c2
RBP: ffff88802f8af1a0 R08: ffffea000000000f R09: ffff88813fffa000
R10: 000000000000000b R11: 00000000ffffffff R12: ffff888079d24800
R13: 0000000005610200 R14: ffff888079d248c2 R15: 0000000000000000
 kmsan_in_runtime mm/kmsan/kmsan.h:66 [inline]
 kmsan_get_shadow_origin_ptr+0x29/0xb0 mm/kmsan/kmsan_shadow.c:141
 __msan_metadata_ptr_for_load_1+0x10/0x20 mm/kmsan/kmsan_instr.c:52
 pskb_expand_head+0x1627/0x1e20 net/core/skbuff.c:1701
 skb_ensure_writable+0x4cf/0x590 net/core/skbuff.c:5565
 __bpf_try_make_writable net/core/filter.c:1654 [inline]
 bpf_try_make_writable net/core/filter.c:1660 [inline]
 bpf_try_make_head_writable net/core/filter.c:1668 [inline]
 ____bpf_clone_redirect net/core/filter.c:2442 [inline]
 bpf_clone_redirect+0x25d/0x660 net/core/filter.c:2420
 ___bpf_prog_run+0x2b78/0xb950 kernel/bpf/core.c:1525
 __bpf_prog_run512+0x12e/0x190 kernel/bpf/core.c:1750
 bpf_test_run+0x53f/0xe60 include/linux/filter.h:770
 bpf_prog_test_run_skb+0x1914/0x3500 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline]
 __do_sys_bpf+0xbe6f/0x1aba0 kernel/bpf/syscall.c:4411
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4351
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4351
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f02549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f54ba5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000040
RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

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+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2922 [inline]
 __kmalloc_node_track_caller+0xa4f/0x1470 mm/slub.c:4609
 kmalloc_reserve net/core/skbuff.c:353 [inline]
 pskb_expand_head+0x25e/0x1e20 net/core/skbuff.c:1676
 netif_receive_generic_xdp+0x61c/0x2590 net/core/dev.c:4699
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
=====================================================
------------[ cut here ]------------
Illegal XDP return value 4294967274, expect packet loss!
WARNING: CPU: 0 PID: 32683 at net/core/filter.c:8111 bpf_warn_invalid_xdp_action+0x147/0x150 net/core/filter.c:8109
Modules linked in:
CPU: 0 PID: 32683 Comm: syz-executor.3 Tainted: G    B             5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:bpf_warn_invalid_xdp_action+0x147/0x150 net/core/filter.c:8109
Code: 45 89 bd 50 06 00 00 45 89 a5 70 09 00 00 49 c7 85 80 0c 00 00 00 00 00 00 48 c7 c7 d4 2e 9e 90 44 89 f2 31 c0 e8 09 c5 ef f4 <0f> 0b e9 fa fe ff ff 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53
RSP: 0018:ffff88813fc05890 EFLAGS: 00010246
RAX: 5e31d3f480954a00 RBX: 00000000ffffff00 RCX: ffff8880b23abe80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88813fc058b8 R08: ffffffff81a4b0aa R09: ffff88813fffa000
R10: 0000000000000003 R11: 00000000ffffffff R12: 0000000004b100cc
R13: ffff88813fc27b00 R14: 00000000ffffffea R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88813fc00000(0063) knlGS:00000000f54bab40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002ef25000 CR3: 000000012106b000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 netif_receive_generic_xdp+0x1ed6/0x2590 net/core/dev.c:4768
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:422
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0xc6/0xf0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 0010:kmsan_get_task_state+0xb/0x40 mm/kmsan/kmsan.c:59
Code: 5f 5d c3 8b bb 88 0c 00 00 e8 d1 16 00 00 e9 71 ff ff ff cc cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 65 8b 05 dd 5e c2 7d <a9> 00 01 ff 00 74 11 48 c7 c0 00 7b 02 00 65 48 03 05 17 07 c2 7d
RSP: 0018:ffff88802f8af1a0 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: 0000000120019ec4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888079d248c2
RBP: ffff88802f8af1a0 R08: ffffea000000000f R09: ffff88813fffa000
R10: 000000000000000b R11: 00000000ffffffff R12: ffff888079d24800
R13: 0000000005610200 R14: ffff888079d248c2 R15: 0000000000000000
 kmsan_in_runtime mm/kmsan/kmsan.h:66 [inline]
 kmsan_get_shadow_origin_ptr+0x29/0xb0 mm/kmsan/kmsan_shadow.c:141
 __msan_metadata_ptr_for_load_1+0x10/0x20 mm/kmsan/kmsan_instr.c:52
 pskb_expand_head+0x1627/0x1e20 net/core/skbuff.c:1701
 skb_ensure_writable+0x4cf/0x590 net/core/skbuff.c:5565
 __bpf_try_make_writable net/core/filter.c:1654 [inline]
 bpf_try_make_writable net/core/filter.c:1660 [inline]
 bpf_try_make_head_writable net/core/filter.c:1668 [inline]
 ____bpf_clone_redirect net/core/filter.c:2442 [inline]
 bpf_clone_redirect+0x25d/0x660 net/core/filter.c:2420
 ___bpf_prog_run+0x2b78/0xb950 kernel/bpf/core.c:1525
 __bpf_prog_run512+0x12e/0x190 kernel/bpf/core.c:1750
 bpf_test_run+0x53f/0xe60 include/linux/filter.h:770
 bpf_prog_test_run_skb+0x1914/0x3500 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline]
 __do_sys_bpf+0xbe6f/0x1aba0 kernel/bpf/syscall.c:4411
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4351
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4351
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f02549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f54ba5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000040
RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
---[ end trace 671fe4aba0bebf5d ]---
=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
CPU: 0 PID: 32683 Comm: syz-executor.3 Tainted: G    B   W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:422
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0xc6/0xf0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 0010:kmsan_get_task_state+0xb/0x40 mm/kmsan/kmsan.c:59
Code: 5f 5d c3 8b bb 88 0c 00 00 e8 d1 16 00 00 e9 71 ff ff ff cc cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 65 8b 05 dd 5e c2 7d <a9> 00 01 ff 00 74 11 48 c7 c0 00 7b 02 00 65 48 03 05 17 07 c2 7d
RSP: 0018:ffff88802f8af1a0 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: 0000000120019ec4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888079d248c2
RBP: ffff88802f8af1a0 R08: ffffea000000000f R09: ffff88813fffa000
R10: 000000000000000b R11: 00000000ffffffff R12: ffff888079d24800
R13: 0000000005610200 R14: ffff888079d248c2 R15: 0000000000000000
 kmsan_in_runtime mm/kmsan/kmsan.h:66 [inline]
 kmsan_get_shadow_origin_ptr+0x29/0xb0 mm/kmsan/kmsan_shadow.c:141
 __msan_metadata_ptr_for_load_1+0x10/0x20 mm/kmsan/kmsan_instr.c:52
 pskb_expand_head+0x1627/0x1e20 net/core/skbuff.c:1701
 skb_ensure_writable+0x4cf/0x590 net/core/skbuff.c:5565
 __bpf_try_make_writable net/core/filter.c:1654 [inline]
 bpf_try_make_writable net/core/filter.c:1660 [inline]
 bpf_try_make_head_writable net/core/filter.c:1668 [inline]
 ____bpf_clone_redirect net/core/filter.c:2442 [inline]
 bpf_clone_redirect+0x25d/0x660 net/core/filter.c:2420
 ___bpf_prog_run+0x2b78/0xb950 kernel/bpf/core.c:1525
 __bpf_prog_run512+0x12e/0x190 kernel/bpf/core.c:1750
 bpf_test_run+0x53f/0xe60 include/linux/filter.h:770
 bpf_prog_test_run_skb+0x1914/0x3500 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline]
 __do_sys_bpf+0xbe6f/0x1aba0 kernel/bpf/syscall.c:4411
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4351
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4351
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f02549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f54ba5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000040
RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

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+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2922 [inline]
 __kmalloc_node_track_caller+0xa4f/0x1470 mm/slub.c:4609
 kmalloc_reserve net/core/skbuff.c:353 [inline]
 pskb_expand_head+0x25e/0x1e20 net/core/skbuff.c:1676
 netif_receive_generic_xdp+0x61c/0x2590 net/core/dev.c:4699
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
=====================================================
=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
CPU: 0 PID: 32683 Comm: syz-executor.3 Tainted: G    B   W         5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
 invoke_softirq kernel/softirq.c:221 [inline]
 __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:422
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:434
 sysvec_apic_timer_interrupt+0xc6/0xf0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:650
RIP: 0010:kmsan_get_task_state+0xb/0x40 mm/kmsan/kmsan.c:59
Code: 5f 5d c3 8b bb 88 0c 00 00 e8 d1 16 00 00 e9 71 ff ff ff cc cc cc cc cc cc cc cc cc cc cc cc 55 48 89 e5 65 8b 05 dd 5e c2 7d <a9> 00 01 ff 00 74 11 48 c7 c0 00 7b 02 00 65 48 03 05 17 07 c2 7d
RSP: 0018:ffff88802f8af1a0 EFLAGS: 00000202
RAX: 0000000080000000 RBX: 0000000000000001 RCX: 0000000120019ec4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888079d248c2
RBP: ffff88802f8af1a0 R08: ffffea000000000f R09: ffff88813fffa000
R10: 000000000000000b R11: 00000000ffffffff R12: ffff888079d24800
R13: 0000000005610200 R14: ffff888079d248c2 R15: 0000000000000000
 kmsan_in_runtime mm/kmsan/kmsan.h:66 [inline]
 kmsan_get_shadow_origin_ptr+0x29/0xb0 mm/kmsan/kmsan_shadow.c:141
 __msan_metadata_ptr_for_load_1+0x10/0x20 mm/kmsan/kmsan_instr.c:52
 pskb_expand_head+0x1627/0x1e20 net/core/skbuff.c:1701
 skb_ensure_writable+0x4cf/0x590 net/core/skbuff.c:5565
 __bpf_try_make_writable net/core/filter.c:1654 [inline]
 bpf_try_make_writable net/core/filter.c:1660 [inline]
 bpf_try_make_head_writable net/core/filter.c:1668 [inline]
 ____bpf_clone_redirect net/core/filter.c:2442 [inline]
 bpf_clone_redirect+0x25d/0x660 net/core/filter.c:2420
 ___bpf_prog_run+0x2b78/0xb950 kernel/bpf/core.c:1525
 __bpf_prog_run512+0x12e/0x190 kernel/bpf/core.c:1750
 bpf_test_run+0x53f/0xe60 include/linux/filter.h:770
 bpf_prog_test_run_skb+0x1914/0x3500 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline]
 __do_sys_bpf+0xbe6f/0x1aba0 kernel/bpf/syscall.c:4411
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4351
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4351
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x127/0x180 arch/x86/entry/common.c:142
 do_fast_syscall_32+0x77/0xd0 arch/x86/entry/common.c:168
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:211
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7f02549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f54ba5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000040
RDX: 0000000000000048 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

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+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2922 [inline]
 __kmalloc_node_track_caller+0xa4f/0x1470 mm/slub.c:4609
 kmalloc_reserve net/core/skbuff.c:353 [inline]
 pskb_expand_head+0x25e/0x1e20 net/core/skbuff.c:1676
 netif_receive_generic_xdp+0x61c/0x2590 net/core/dev.c:4699
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
=====================================================
=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
CPU: 0 PID: 11 Comm: ksoftirqd/0 Tainted: G    B   W         5.12.0-rc6-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+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 netif_receive_generic_xdp+0x15c2/0x2590 net/core/dev.c:4751
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
 run_ksoftirqd+0x20/0x40 kernel/softirq.c:652
 smpboot_thread_fn+0x5f5/0xa90 kernel/smpboot.c:165
 kthread+0x521/0x560 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

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+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2922 [inline]
 __kmalloc_node_track_caller+0xa4f/0x1470 mm/slub.c:4609
 kmalloc_reserve net/core/skbuff.c:353 [inline]
 pskb_expand_head+0x25e/0x1e20 net/core/skbuff.c:1676
 netif_receive_generic_xdp+0x61c/0x2590 net/core/dev.c:4699
 do_xdp_generic net/core/dev.c:4816 [inline]
 __netif_receive_skb_core+0x294a/0x65a0 net/core/dev.c:5207
 __netif_receive_skb_one_core net/core/dev.c:5382 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5498
 process_backlog+0x517/0xbd0 net/core/dev.c:6365
 __napi_poll+0x13e/0xca0 net/core/dev.c:6912
 napi_poll net/core/dev.c:6979 [inline]
 net_rx_action+0x726/0x14a0 net/core/dev.c:7065
 __do_softirq+0x1b9/0x715 kernel/softirq.c:345
=====================================================