=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4687
CPU: 0 PID: 13494 Comm: syz-executor.3 Not tainted 5.11.0-rc7-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+0x21c/0x280 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
 netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4687
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x106/0x130 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:__msan_chain_origin+0x7b/0xa0 mm/kmsan/kmsan_instr.c:150
Code: f7 e8 49 f3 ff ff 89 c3 e8 32 eb ff ff 8b b0 b0 0f 00 00 ff ce 89 b0 b0 0f 00 00 75 1c e8 fd 3e 0d ff 4c 89 7d e0 ff 75 e0 9d <89> d8 48 83 c4 10 5b 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 2b b7 5a 90
RSP: 0018:ffff8880136d3258 EFLAGS: 00000246
RAX: ffff888120ad48f8 RBX: 00000000265601d8 RCX: 00000000163c01d8
RDX: 0000000000000a20 RSI: 0000000000000000 RDI: 00000000065601d8
RBP: ffff8880136d3280 R08: 0000000000000003 R09: ffff8880136d300c
R10: 00000000e5cc724d R11: ffffffff8fa00715 R12: ffff8881178798a0
R13: ffff888117879800 R14: 00000000163c01d8 R15: 0000000000000246
 __skb_clone+0x7d4/0x9b0 net/core/skbuff.c:1006
 skb_clone+0x444/0x660 net/core/skbuff.c:1465
 ____bpf_clone_redirect net/core/filter.c:2433 [inline]
 bpf_clone_redirect+0x188/0x660 net/core/filter.c:2420
 ___bpf_prog_run+0x4279/0x93e0 kernel/bpf/core.c:1513
 __bpf_prog_run512+0x12e/0x190 kernel/bpf/core.c:1691
 bpf_test_run+0x544/0xea0 include/linux/filter.h:743
 bpf_prog_test_run_skb+0x1914/0x3500 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3122 [inline]
 __do_sys_bpf+0xbd97/0x1a840 kernel/bpf/syscall.c:4400
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4340
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4340
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fb1549
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:00000000f55ab5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000080
RDX: 0000000000000028 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+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2907 [inline]
 __kmalloc_node_track_caller+0xa37/0x1430 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x25e/0x1e20 net/core/skbuff.c:1638
 netif_receive_generic_xdp+0x64b/0x2540 net/core/dev.c:4633
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343
=====================================================
------------[ cut here ]------------
Illegal XDP return value 4294967274, expect packet loss!
WARNING: CPU: 0 PID: 13494 at net/core/filter.c:7931 bpf_warn_invalid_xdp_action+0x147/0x150 net/core/filter.c:7929
Modules linked in:
CPU: 0 PID: 13494 Comm: syz-executor.3 Tainted: G    B             5.11.0-rc7-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:7929
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 79 a0 7c 90 44 89 f2 31 c0 e8 29 57 08 f5 <0f> 0b e9 fa fe ff ff 66 90 55 48 89 e5 41 57 41 56 41 55 41 54 53
RSP: 0018:ffff88813fc058a0 EFLAGS: 00010246
RAX: 32d7f6eb1297ba00 RBX: 00000000ffffff00 RCX: ffff888120ad3e80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88813fc058c8 R08: ffffffff81a3bafa R09: ffff88813fffa000
R10: 0000000000000003 R11: 00000000ffffffff R12: 00000000062100cd
R13: ffff88813fc27f40 R14: 00000000ffffffea R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88813fc00000(0063) knlGS:00000000f55abb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000009e07404 CR3: 000000001ace5000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 netif_receive_generic_xdp+0x1b3d/0x2540 net/core/dev.c:4704
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu+0x22f/0x280 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x106/0x130 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:__msan_chain_origin+0x7b/0xa0 mm/kmsan/kmsan_instr.c:150
Code: f7 e8 49 f3 ff ff 89 c3 e8 32 eb ff ff 8b b0 b0 0f 00 00 ff ce 89 b0 b0 0f 00 00 75 1c e8 fd 3e 0d ff 4c 89 7d e0 ff 75 e0 9d <89> d8 48 83 c4 10 5b 41 5e 41 5f 5d c3 0f 0b 48 c7 c7 2b b7 5a 90
RSP: 0018:ffff8880136d3258 EFLAGS: 00000246
RAX: ffff888120ad48f8 RBX: 00000000265601d8 RCX: 00000000163c01d8
RDX: 0000000000000a20 RSI: 0000000000000000 RDI: 00000000065601d8
RBP: ffff8880136d3280 R08: 0000000000000003 R09: ffff8880136d300c
R10: 00000000e5cc724d R11: ffffffff8fa00715 R12: ffff8881178798a0
R13: ffff888117879800 R14: 00000000163c01d8 R15: 0000000000000246
 __skb_clone+0x7d4/0x9b0 net/core/skbuff.c:1006
 skb_clone+0x444/0x660 net/core/skbuff.c:1465
 ____bpf_clone_redirect net/core/filter.c:2433 [inline]
 bpf_clone_redirect+0x188/0x660 net/core/filter.c:2420
 ___bpf_prog_run+0x4279/0x93e0 kernel/bpf/core.c:1513
 __bpf_prog_run512+0x12e/0x190 kernel/bpf/core.c:1691
 bpf_test_run+0x544/0xea0 include/linux/filter.h:743
 bpf_prog_test_run_skb+0x1914/0x3500 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3122 [inline]
 __do_sys_bpf+0xbd97/0x1a840 kernel/bpf/syscall.c:4400
 __se_sys_bpf+0x8e/0xa0 kernel/bpf/syscall.c:4340
 __ia32_sys_bpf+0x4a/0x70 kernel/bpf/syscall.c:4340
 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline]
 __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fb1549
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:00000000f55ab5fc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000080
RDX: 0000000000000028 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
---[ end trace e08360431ce7b9e1 ]---
=====================================================
BUG: KMSAN: uninit-value in netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4687
CPU: 0 PID: 11 Comm: ksoftirqd/0 Tainted: G    B   W         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+0x21c/0x280 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
 netif_receive_generic_xdp+0x158b/0x2540 net/core/dev.c:4687
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343
 run_ksoftirqd+0x20/0x40 kernel/softirq.c:650
 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:296

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+0xa37/0x1430 mm/slub.c:4527
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 pskb_expand_head+0x25e/0x1e20 net/core/skbuff.c:1638
 netif_receive_generic_xdp+0x64b/0x2540 net/core/dev.c:4633
 do_xdp_generic net/core/dev.c:4752 [inline]
 __netif_receive_skb_core+0x298b/0x6640 net/core/dev.c:5144
 __netif_receive_skb_one_core net/core/dev.c:5321 [inline]
 __netif_receive_skb+0xf2/0x640 net/core/dev.c:5437
 process_backlog+0x517/0xbd0 net/core/dev.c:6328
 napi_poll+0x428/0x15c0 net/core/dev.c:6806
 net_rx_action+0x34c/0xd30 net/core/dev.c:6889
 __do_softirq+0x1b9/0x715 kernel/softirq.c:343
=====================================================