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BUG: KCSAN: data-race in audit_log_start / skb_queue_tail

write to 0xffffffff89519150 of 4 bytes by task 19288 on cpu 0:
 __skb_insert include/linux/skbuff.h:1911 [inline]
 __skb_queue_before include/linux/skbuff.h:2016 [inline]
 __skb_queue_tail include/linux/skbuff.h:2049 [inline]
 skb_queue_tail+0x80/0xa0 net/core/skbuff.c:3146
 audit_log_end+0x171/0x1e0 kernel/audit.c:2387
 audit_seccomp+0x108/0x120 kernel/auditsc.c:2680
 seccomp_log kernel/seccomp.c:767 [inline]
 __seccomp_filter+0xc87/0xe90 kernel/seccomp.c:1042
 __secure_computing+0x12e/0x1c0 kernel/seccomp.c:1070
 syscall_trace_enter+0x10f/0x2c0 kernel/entry/common.c:58
 __syscall_enter_from_user_work kernel/entry/common.c:81 [inline]
 syscall_enter_from_user_mode+0x2a/0x40 kernel/entry/common.c:99
 do_syscall_64+0x11/0x80 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff89519150 of 4 bytes by task 19298 on cpu 1:
 skb_queue_len include/linux/skbuff.h:1842 [inline]
 audit_log_start+0x18c/0x6a0 kernel/audit.c:1834
 audit_seccomp+0x47/0x120 kernel/auditsc.c:2673
 seccomp_log kernel/seccomp.c:767 [inline]
 __seccomp_filter+0xc87/0xe90 kernel/seccomp.c:1042
 __secure_computing+0x12e/0x1c0 kernel/seccomp.c:1070
 syscall_trace_enter+0x10f/0x2c0 kernel/entry/common.c:58
 __syscall_enter_from_user_work kernel/entry/common.c:81 [inline]
 syscall_enter_from_user_mode+0x2a/0x40 kernel/entry/common.c:99
 do_syscall_64+0x11/0x80 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19298 Comm:  *:* ˜ÿ­@ÃSï~ÕŠ Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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