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BUG: KCSAN: data-race in audit_log_start / skb_queue_tail

write to 0xffffffff84180d10 of 4 bytes by task 18342 on cpu 1:
 __skb_insert include/linux/skbuff.h:1938 [inline]
 __skb_queue_before include/linux/skbuff.h:2043 [inline]
 __skb_queue_tail include/linux/skbuff.h:2076 [inline]
 skb_queue_tail+0x80/0xa0 net/core/skbuff.c:3264
 audit_log_end+0x171/0x1e0 kernel/audit.c:2389
 audit_seccomp+0xd9/0xf0 kernel/auditsc.c:2684
 seccomp_log kernel/seccomp.c:1009 [inline]
 __seccomp_filter+0xd24/0xf20 kernel/seccomp.c:1309
 __secure_computing+0xfb/0x140 kernel/seccomp.c:1339
 syscall_trace_enter+0x120/0x290 kernel/entry/common.c:68
 __syscall_enter_from_user_work kernel/entry/common.c:90 [inline]
 syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:108
 do_syscall_64+0x1e/0x90 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff84180d10 of 4 bytes by task 18346 on cpu 0:
 skb_queue_len include/linux/skbuff.h:1869 [inline]
 audit_log_start+0x16c/0x670 kernel/audit.c:1833
 audit_seccomp+0x45/0xf0 kernel/auditsc.c:2677
 seccomp_log kernel/seccomp.c:1009 [inline]
 __seccomp_filter+0xd24/0xf20 kernel/seccomp.c:1309
 __secure_computing+0xfb/0x140 kernel/seccomp.c:1339
 syscall_trace_enter+0x120/0x290 kernel/entry/common.c:68
 __syscall_enter_from_user_work kernel/entry/common.c:90 [inline]
 syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:108
 do_syscall_64+0x1e/0x90 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18346 Comm:  *:* ˜ÿ­@ÃSï~ÕŠ Tainted: G        W         5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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