KCSAN: data-race in do_signal_stop / prepare

KCSAN: data-race in do_signal_stop / prepare_signal
Status: auto-closed as invalid on 2021/06/25 01:29
Reported-by: syzbot+60abfb3e5fb112d5a211@syzkaller.appspotmail.com
First crash: 650d, last: 76d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in do_signal_stop / prepare_signal

write to 0xffff888140ea606c of 4 bytes by task 8008 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_signal_stop+0x591/0x710 kernel/signal.c:2432
 get_signal+0xa16/0x1610 kernel/signal.c:2770
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888140ea606c of 4 bytes by interrupt on cpu 0:
 sig_task_ignored kernel/signal.c:93 [inline]
 sig_ignored kernel/signal.c:118 [inline]
 prepare_signal+0x952/0xeb0 kernel/signal.c:1001
 send_sigqueue+0xea/0x3e0 kernel/signal.c:1897
 posix_timer_event kernel/time/posix-timers.c:354 [inline]
 posix_timer_fn+0xe8/0x210 kernel/time/posix-timers.c:380
 __run_hrtimer+0x160/0x480 kernel/time/hrtimer.c:1537
 __hrtimer_run_queues kernel/time/hrtimer.c:1601 [inline]
 hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
 __init_waitqueue_head+0x0/0x20
 ep_alloc fs/eventpoll.c:943 [inline]
 do_epoll_create+0x11a/0x250 fs/eventpoll.c:1971
 __do_sys_epoll_create1 fs/eventpoll.c:2002 [inline]
 __se_sys_epoll_create1 fs/eventpoll.c:2000 [inline]
 __x64_sys_epoll_create1+0x1a/0x20 fs/eventpoll.c:2000
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8073 Comm: systemd-udevd Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (334):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/05/21 01:28	upstream	ba816d3c265c	3c7fef33	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/17 21:26	upstream	d07f6ca923ea	a343ba6b	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/17 08:58	upstream	d07f6ca923ea	a2eb125d	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/15 10:34	upstream	25a1298726e9	93f844de	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/14 02:54	upstream	315d99318179	8bdd5343	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/08 23:48	upstream	b741596468b0	bc5434be	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/08 10:36	upstream	dd860052c99b	bc5434be	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/05/07 04:26	upstream	e48661230cc3	06585184	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/29 11:30	upstream	d72cd4ad4174	77e2b668	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/27 10:24	upstream	4a0225c3d208	805b5003	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/24 18:15	upstream	2a1d7946fa53	17f0b706	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/22 12:47	upstream	16fc44d6387e	33c28d03	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/17 07:24	upstream	9cdbf6467424	7e2b734b	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/12 22:59	upstream	89698becf06d	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/11 19:49	upstream	7d900724913c	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/10 15:02	upstream	d4961772226d	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/02 08:26	upstream	1678e493d530	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/04/01 18:39	upstream	ffd9fb546d49	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/31 19:41	upstream	d19cc4bfbff1	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/31 06:59	upstream	5e46d1b78a03	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/29 21:24	upstream	1e43c377a79f	6a81331a	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/23 15:59	upstream	84196390620a	e613994b	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/22 18:45	upstream	0d02ec6b3136	8092f30d	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/19 21:17	upstream	8b12a62a4e3e	3d01c4de	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/18 03:36	upstream	6417f03132a6	fdb2bb2c	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/12 10:28	upstream	f78d76e72a46	429d8a6b	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/09 17:28	upstream	144c79ef3353	26967e35	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/04 07:40	upstream	f69d02e37a85	d7e4e604	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/03/03 23:51	upstream	f69d02e37a85	06ed56cd	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/14 00:40	upstream	ac30d8ce28d6	98682e5e	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/10 14:06	upstream	e0756cfc7d7c	9c8b8541	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/08 13:09	upstream	92bf22614b21	2ce644fc	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/06 12:12	upstream	1e0d27fce010	0655e081	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/06 03:56	upstream	1e0d27fce010	23a562df	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/02 23:59	upstream	3aaf0a27ffc2	624dad51	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/02/01 14:06	upstream	1048ba83fb1c	e6b95f32	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/01/30 22:33	upstream	8c947645151c	fc9fd31e	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/01/19 00:16	upstream	1e2a199f6ccd	63631df1	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/01/18 04:28	upstream	19c329f68089	fd103621	.config	log	report	info	KCSAN: data-race in do_signal_stop / prepare_signal
ci2-upstream-kcsan-gce	2021/01/15 20:09	upstream	5ee88057889b	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 00:51	upstream	146620506274	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/14 18:59	upstream	65f0d2414b70	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/13 21:39	upstream	65f0d2414b70	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/13 11:24	upstream	e609571b5ffa	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 19:14	upstream	e609571b5ffa	0cdd6185	.config	log	report	info
ci2-upstream-kcsan-gce	2020/01/23 15:07	https://github.com/google/ktsan.git kcsan	245a43005292	11ebf937	.config	log	report
ci2-upstream-kcsan-gce	2020/01/20 11:17	https://github.com/google/ktsan.git kcsan	245a43005292	c40da18c	.config	log	report
ci2-upstream-kcsan-gce	2019/10/24 19:31	https://github.com/google/ktsan.git kcsan	05f2236801fe	d01bb02a	.config	log	report