KCSAN: data-race in kauditd_thread / skb_queue

KCSAN: data-race in kauditd_thread / skb_queue_tail
Status: moderation: reported on 2020/09/28 07:58
Reported-by: syzbot+a9a394e8954976475007@syzkaller.appspotmail.com
First crash: 539d, last: 8h23m

Sample crash report:

audit: type=1326 audit(1618440406.095:73): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=13493 comm="syz-executor.0" exe="/root/syz-executor.0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x466459 code=0x7fc00000
audit: type=1326 audit(1618440406.095:74): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=13493 comm="syz-executor.0" exe="/root/syz-executor.0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x466459 code=0x7fc00000
audit: type=1326 audit(1618440406.095:75): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=13493 comm="syz-executor.0" exe="/root/syz-executor.0" sig=0 arch=c000003e syscall=202 compat=0 ip=0x466459 code=0x7fc00000
==================================================================
BUG: KCSAN: data-race in kauditd_thread / skb_queue_tail

write to 0xffffffff88f2d810 of 4 bytes by task 13501 on cpu 0:
 __skb_insert include/linux/skbuff.h:1930 [inline]
 __skb_queue_before include/linux/skbuff.h:2035 [inline]
 __skb_queue_tail include/linux/skbuff.h:2068 [inline]
 skb_queue_tail+0x80/0xa0 net/core/skbuff.c:3200
 audit_log_end+0x171/0x1e0 kernel/audit.c:2389
 audit_seccomp+0x108/0x120 kernel/auditsc.c:2667
 seccomp_log kernel/seccomp.c:1004 [inline]
 __seccomp_filter+0xc97/0xe90 kernel/seccomp.c:1279
 __secure_computing+0x12e/0x1c0 kernel/seccomp.c:1309
 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+0x44/0xae

read to 0xffffffff88f2d810 of 4 bytes by task 36 on cpu 1:
 skb_queue_len include/linux/skbuff.h:1861 [inline]
 kauditd_thread+0x4ed/0x6d0 kernel/audit.c:881
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 36 Comm: kauditd Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1031):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/14 22:46	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/14 11:08	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/13 21:39	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/13 19:18	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/12 22:58	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/12 09:31	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/11 20:16	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/11 04:16	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/10 14:51	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/10 01:00	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/09 11:55	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/08 22:52	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/08 09:25	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/07 19:27	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/06 21:06	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/05 18:49	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/04 22:21	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/04 02:54	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/03 13:31	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/02 23:45	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/02 08:27	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/04/01 21:51	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/31 20:35	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/31 06:46	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/30 17:34	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/29 20:41	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/29 12:10	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/28 21:32	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/27 01:06	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/26 10:56	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/25 23:18	upstream	00232240	6a383ecf	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/25 09:17	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/24 20:38	upstream	4ee998b0	607e3baf	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/24 13:47	upstream	7acac4b3	607e3baf	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/23 19:05	upstream	7acac4b3	e613994b	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/23 07:53	upstream	84196390	8092f30d	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/22 17:56	upstream	0d02ec6b	bea32f74	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/22 03:58	upstream	5ee96fa9	bea32f74	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/21 22:51	upstream	5ee96fa9	4c9a64da	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/21 14:49	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/20 22:18	upstream	812da4d3	17810eae	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/03/20 10:44	upstream	1c273e10	e45f5621	.config	log	report	info	KCSAN: data-race in kauditd_thread / skb_queue_tail
ci2-upstream-kcsan-gce	2021/01/17 10:04	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/28 02:19	upstream	a1b8638b	5dd8aee8	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 15:40	https://github.com/google/ktsan.git kcsan	05f22368	b602d64b	.config	log	report