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BUG: KCSAN: data-race in audit_log_start / skb_queue_tail

write to 0xffffffff86231640 of 4 bytes by task 25002 on cpu 1:
 __skb_insert include/linux/skbuff.h:1890 [inline]
 __skb_queue_before include/linux/skbuff.h:1995 [inline]
 __skb_queue_tail include/linux/skbuff.h:2028 [inline]
 skb_queue_tail+0xf0/0x130 net/core/skbuff.c:3146
 audit_log_end+0xab/0x240 kernel/audit.c:2319
 audit_seccomp+0x12b/0x1a0 kernel/auditsc.c:2618
 seccomp_log kernel/seccomp.c:675 [inline]
 __seccomp_filter+0x6ac/0xf30 kernel/seccomp.c:920
 __secure_computing+0xb4/0x210 kernel/seccomp.c:948
 syscall_trace_enter+0x215/0x740 arch/x86/entry/common.c:118
 do_syscall_64+0x2bf/0x3a0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff86231640 of 4 bytes by task 24998 on cpu 0:
 audit_log_start kernel/audit.c:1769 [inline]
 audit_log_start+0xf9/0x610 kernel/audit.c:1745
 audit_seccomp+0x54/0x1a0 kernel/auditsc.c:2611
 seccomp_log kernel/seccomp.c:675 [inline]
 __seccomp_filter+0x6ac/0xf30 kernel/seccomp.c:920
 __secure_computing+0xb4/0x210 kernel/seccomp.c:948
 syscall_trace_enter+0x215/0x740 arch/x86/entry/common.c:118
 do_syscall_64+0x2bf/0x3a0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24998 Comm: syz-executor.2 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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