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BUG: KCSAN: data-race in audit_log_start / skb_queue_tail

read-write to 0xffffffff88304850 of 4 bytes by task 11842 on cpu 1:
 __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 11834 on cpu 0:
 skb_queue_len include/linux/skbuff.h:1848 [inline]
 audit_log_start+0x18c/0x6c0 kernel/audit.c:1833
 audit_seccomp+0x47/0x120 kernel/auditsc.c:2659
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11834 Comm: syz-executor.1 Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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