KCSAN: data-race in do_epoll_ctl / do_epoll

KCSAN: data-race in do_epoll_ctl / do_epoll_wait
Status: moderation: reported on 2020/11/05 16:13
Reported-by: syzbot+19480160ef25c9ffa29d@syzkaller.appspotmail.com
First crash: 487d, last: 5d16h

Sample crash report:

==================================================================
BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_wait

write to 0xffff8881035ed058 of 8 bytes by task 16808 on cpu 1:
 __list_add include/linux/list.h:72 [inline]
 list_add_tail include/linux/list.h:102 [inline]
 ep_insert fs/eventpoll.c:1535 [inline]
 do_epoll_ctl+0x1331/0x1880 fs/eventpoll.c:2134
 __do_sys_epoll_ctl fs/eventpoll.c:2185 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2176 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2176
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881035ed058 of 8 bytes by task 1804 on cpu 0:
 list_empty_careful include/linux/list.h:321 [inline]
 ep_events_available fs/eventpoll.c:374 [inline]
 ep_poll fs/eventpoll.c:1790 [inline]
 do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2227
 do_epoll_pwait fs/eventpoll.c:2261 [inline]
 __do_sys_epoll_pwait fs/eventpoll.c:2274 [inline]
 __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2268
 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2268
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff8881035ed050 -> 0xffff8881623c8298

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1804 Comm: syz-fuzzer Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (176):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/12/02 17:35	upstream	58e1100fdc59	61f86278	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/24 09:34	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/22 11:56	upstream	136057256686	4eb20a4e	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/18 18:35	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/18 07:45	upstream	42eb8fdac2fc	cafff8b6	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/12 13:22	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/10 15:06	upstream	cb690f5238d7	75b04091	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/09 16:29	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/11/09 07:27	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/10/30 01:56	upstream	a379fbbcb88b	098b5d53	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/10/22 11:22	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/10/19 03:08	upstream	519d81956ee2	24dc29db	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/10/06 07:48	upstream	60a9483534ed	0a63fd36	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/10/05 20:47	upstream	f6274b06e326	8a6b1a8d	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/10/02 07:45	upstream	53d5fc89d66a	db0f5787	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/09/29 23:19	upstream	02d5e016800d	be530f6c	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/09/26 14:40	upstream	a3b397b4fffb	8cac236e	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/09/20 10:25	upstream	e4e737bb5c17	3d9c9a2a	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/09/12 02:15	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/08/25 19:35	upstream	fe67f4dd8daa	b599f2fc	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/08/25 13:59	upstream	6e764bcd1cf7	b599f2fc	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/08/22 11:33	upstream	9ff50bf2f2ff	b599f2fc	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/08/21 21:08	upstream	002c0aef1090	b599f2fc	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/08/13 14:15	upstream	f8e6dfc64f61	3fd2ea69	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/07/25 00:38	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/07/21 19:59	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/07/19 23:10	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/07/04 03:51	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/07/02 02:15	upstream	e058a84bfddc	658ebc66	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/29 15:15	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/24 21:18	upstream	4a09d388f2ab	0edbbe31	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/18 00:55	upstream	fd0aa1a4567d	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/17 20:05	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/17 01:25	upstream	6b00bc639f1f	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/13 19:37	upstream	8ecfa36cd4db	1ba81399	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/05 15:01	upstream	9d32fa5d74b1	500c2339	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/06/05 02:15	upstream	16f0596fc1d7	500c2339	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/31 09:54	upstream	8124c8a6b353	032639db	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/28 15:44	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/26 01:20	upstream	a050a6d2b7e8	93d3a9f6	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/23 22:45	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/22 01:11	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/20 18:30	upstream	f01da525b3de	c560a65d	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/18 17:53	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/08 07:02	upstream	1ad77a05cfae	bc5434be	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/06 11:24	upstream	8404c9fbc84b	06c27ff5	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/05 13:52	upstream	d665ea6ea86c	06c27ff5	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/03 18:56	upstream	6f8ee8d36d07	ad61f371	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/02 12:18	upstream	17ae69aba89d	77e2b668	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/05/02 00:15	upstream	10a3efd0fee5	77e2b668	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/04/29 16:40	upstream	d72cd4ad4174	77e2b668	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/04/28 23:31	upstream	68a32ba14177	77e2b668	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/04/28 00:55	upstream	e359bce39d90	805b5003	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/04/26 20:03	upstream	9f4ad9e425a1	805b5003	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/04/26 05:20	upstream	d2d09fbe33f8	2a82f1b3	.config	log	report	info	KCSAN: data-race in do_epoll_ctl / do_epoll_wait
ci2-upstream-kcsan-gce	2021/01/16 23:58	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/04 06:06	upstream	4ef8451b3326	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/08 05:10	upstream	30185b69a2d5	ff51e522	.config	log	report