audit: type=1326 audit(1610877881.694:36013): auid=0 uid=0 gid=0 ses=4 subj==unconfined pid=10767 comm="syz-executor.2" exe="/root/syz-executor.2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x45e219 code=0x50000
audit: type=1326 audit(1610877881.694:36014): auid=0 uid=0 gid=0 ses=4 subj==unconfined pid=10767 comm="syz-executor.2" exe="/root/syz-executor.2" sig=0 arch=c000003e syscall=202 compat=0 ip=0x45e219 code=0x50000
==================================================================
BUG: KCSAN: data-race in kauditd_thread / skb_queue_tail

read-write to 0xffffffff88304850 of 4 bytes by task 10773 on cpu 0:
 __skb_insert include/linux/skbuff.h:1917 [inline]
 __skb_queue_before include/linux/skbuff.h:2022 [inline]
 __skb_queue_tail include/linux/skbuff.h:2055 [inline]
 skb_queue_tail+0x75/0x90 net/core/skbuff.c:3158
 audit_log_end+0x165/0x1e0 kernel/audit.c:2389
 audit_seccomp+0x105/0x120 kernel/auditsc.c:2666
 seccomp_log kernel/seccomp.c:1004 [inline]
 __seccomp_filter+0xc77/0xe70 kernel/seccomp.c:1279
 __secure_computing+0x12e/0x1c0 kernel/seccomp.c:1307
 syscall_trace_enter+0x120/0x2b0 kernel/entry/common.c:67
 __syscall_enter_from_user_work kernel/entry/common.c:89 [inline]
 syscall_enter_from_user_mode+0x1c/0x20 kernel/entry/common.c:107
 do_syscall_64+0x11/0x80 arch/x86/entry/common.c:41
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff88304850 of 4 bytes by task 35 on cpu 1:
 skb_queue_len include/linux/skbuff.h:1848 [inline]
 kauditd_thread+0x599/0x6b0 kernel/audit.c:881
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 35 Comm: kauditd Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================