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BUG: KMSAN: uninit-value in __netif_receive_skb_core+0x36b1/0x5890 net/core/dev.c:5197
CPU: 0 PID: 4863 Comm: systemd-journal Not tainted 5.8.0-rc5-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:77 [inline]
 dump_stack+0x1df/0x240 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __netif_receive_skb_core+0x36b1/0x5890 net/core/dev.c:5197
 __netif_receive_skb_one_core net/core/dev.c:5279 [inline]
 __netif_receive_skb net/core/dev.c:5395 [inline]
 process_backlog+0x605/0x14e0 net/core/dev.c:6239
 napi_poll net/core/dev.c:6684 [inline]
 net_rx_action+0x746/0x1aa0 net/core/dev.c:6752
 __do_softirq+0x311/0x83d kernel/softirq.c:293
 asm_call_on_stack+0x12/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:390 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:___bpf_prog_run+0xbd/0x97a0 kernel/bpf/core.c:1391
Code: 68 ff ff ff 4d 85 ed 74 24 8b 7d d4 e8 1c 8d 58 00 eb 1a 66 2e 0f 1f 84 00 00 00 00 00 49 09 c5 4f 8d 64 f4 08 4d 85 ed 75 df <0f> 1f 00 4c 89 6d c8 45 0f b6 3c 24 4c 89 65 c0 4c 89 e7 e8 0b 87
RSP: 0018:ffffa62000d8fa20 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffa62000d3705a RCX: ffffae2000d37058
RDX: ffffb62000d37058 RSI: 0000000000000002 RDI: ffffa62000d37058
RBP: ffffa62000d8fb20 R08: ffffc64f4000000f R09: ffff935c6fffb000
R10: 0000000000000004 R11: ffffffff93392840 R12: ffffa62000d371f8
R13: 0000000000000000 R14: 0000000000000033 R15: 00000000c000003e
 __bpf_prog_run32+0x12e/0x190 kernel/bpf/core.c:1692
 bpf_dispatcher_nop_func include/linux/bpf.h:556 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:597 [inline]
 seccomp_run_filters kernel/seccomp.c:272 [inline]
 __seccomp_filter+0x59e/0x2720 kernel/seccomp.c:817
 __secure_computing+0x1fa/0x380 kernel/seccomp.c:950
 syscall_trace_enter+0x63b/0xe10 arch/x86/entry/common.c:194
 do_syscall_64+0x54/0x150 arch/x86/entry/common.c:382
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f101a6c8f17
Code: Bad RIP value.
RSP: 002b:00007fff07c122c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027
RAX: ffffffffffffffda RBX: 000055e8d24e31e0 RCX: 00007f101a6c8f17
RDX: 0000000000000000 RSI: 000000006def9fb3 RDI: 000055e8d24e31e0
RBP: 00000000000012ff R08: 00007fff07d86080 R09: 0000000000000070
R10: 00000000ffffffff R11: 0000000000000202 R12: ffffffffffffffff
R13: 00007fff07c12378 R14: 000055e8d10bf958 R15: 0005ab8788a289c1

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:310
 __msan_chain_origin+0x50/0x90 mm/kmsan/kmsan_instr.c:165
 vlan_set_encap_proto include/linux/if_vlan.h:656 [inline]
 skb_vlan_untag+0x9a2/0xdb0 net/core/skbuff.c:5431
 __netif_receive_skb_core+0x72d/0x5890 net/core/dev.c:5119
 __netif_receive_skb_one_core net/core/dev.c:5279 [inline]
 __netif_receive_skb net/core/dev.c:5395 [inline]
 process_backlog+0x605/0x14e0 net/core/dev.c:6239
 napi_poll net/core/dev.c:6684 [inline]
 net_rx_action+0x746/0x1aa0 net/core/dev.c:6752
 __do_softirq+0x311/0x83d kernel/softirq.c:293

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127
 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80
 slab_alloc_node mm/slub.c:2839 [inline]
 __kmalloc_node_track_caller+0xb40/0x1200 mm/slub.c:4478
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x2fd/0xac0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1083 [inline]
 alloc_skb_with_frags+0x18c/0xa70 net/core/skbuff.c:5770
 sock_alloc_send_pskb+0xada/0xc60 net/core/sock.c:2356
 packet_alloc_skb net/packet/af_packet.c:2827 [inline]
 packet_snd net/packet/af_packet.c:2922 [inline]
 packet_sendmsg+0x5f04/0x87a0 net/packet/af_packet.c:3004
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 kernel_sendmsg+0x433/0x440 net/socket.c:692
 sock_no_sendpage+0x235/0x300 net/core/sock.c:2853
 kernel_sendpage net/socket.c:3642 [inline]
 sock_sendpage+0x1e1/0x2c0 net/socket.c:945
 pipe_to_sendpage+0x38c/0x4c0 fs/splice.c:448
 splice_from_pipe_feed fs/splice.c:502 [inline]
 __splice_from_pipe+0x565/0xf00 fs/splice.c:626
 splice_from_pipe fs/splice.c:661 [inline]
 generic_splice_sendpage+0x1d5/0x2d0 fs/splice.c:834
 do_splice_from fs/splice.c:846 [inline]
 do_splice+0x2249/0x30a0 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1419 [inline]
 __se_sys_splice+0x271/0x420 fs/splice.c:1401
 __x64_sys_splice+0x6e/0x90 fs/splice.c:1401
 do_syscall_64+0xb0/0x150 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
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