KCSAN: data-race in do_signal_stop / do_signal

KCSAN: data-race in do_signal_stop / do_signal_stop
Status: moderation: reported on 2020/07/03 23:41
Reported-by: syzbot+ba0342a3c9409763fa94@syzkaller.appspotmail.com
First crash: 365d, last: 17d

Sample crash report:

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

write to 0xffff88812c90006c of 4 bytes by task 10668 on cpu 0:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 do_signal_stop+0x591/0x710 kernel/signal.c:2448
 get_signal+0xa16/0x1610 kernel/signal.c:2787
 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 0xffff88812c90006c of 4 bytes by task 10678 on cpu 1:
 task_set_jobctl_pending kernel/signal.c:289 [inline]
 do_signal_stop+0x33e/0x710 kernel/signal.c:2407
 get_signal+0xa16/0x1610 kernel/signal.c:2787
 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

value changed: 0x40404040 -> 0x00404040

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10678 Comm: syz-executor.2 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (441):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/03 01:48	upstream	324c92e5	0740de69	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/06/02 07:48	upstream	231bc539	0740de69	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/06/02 04:32	upstream	231bc539	032639db	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/31 17:12	upstream	c2131f7e	032639db	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/31 09:15	upstream	8124c8a6	032639db	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/31 00:51	upstream	8124c8a6	325a8dab	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/30 07:07	upstream	b90e90f4	325a8dab	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/29 18:19	upstream	f956cb99	325a8dab	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/29 15:45	upstream	6799d4f2	325a8dab	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/28 19:26	upstream	5ff2756a	858ea628	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/28 01:42	upstream	97e5bf60	858ea628	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/27 12:27	upstream	d7c5303f	858ea628	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/26 23:26	upstream	7ac3a1c1	858ea628	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/26 10:05	upstream	ad9f25d3	750ce164	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/26 05:44	upstream	ad9f25d3	93d3a9f6	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/25 16:36	upstream	a050a6d2	93d3a9f6	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/25 03:58	upstream	1434a312	3c7fef33	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/24 13:31	upstream	c4681547	3c7fef33	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/23 23:20	upstream	6ebb6814	3c7fef33	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/23 09:03	upstream	4d762034	3c7fef33	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/21 14:18	upstream	79a106fc	3c7fef33	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/20 17:34	upstream	f01da525	c560a65d	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/17 04:55	upstream	d07f6ca9	f54a5c09	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/16 15:05	upstream	63d1cb53	f54a5c09	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/16 01:36	upstream	c12a29ed	f54a5c09	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/15 07:36	upstream	25a12987	8bdd5343	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/14 18:39	upstream	bd3c9cdb	8bdd5343	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/13 13:24	upstream	c06a2ba6	ecb594cb	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/13 08:29	upstream	c06a2ba6	ed7d41c5	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/12 07:02	upstream	88b06399	86294427	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/11 18:19	upstream	88b06399	ca873091	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/10 12:21	upstream	6efb943b	ca873091	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/10 09:56	upstream	6efb943b	bc5434be	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/09 20:58	upstream	9819f682	bc5434be	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/08 10:33	upstream	dd860052	bc5434be	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/07 08:28	upstream	e4866123	f6da8120	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/06 15:57	upstream	8404c9fb	06585184	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/06 15:48	upstream	8404c9fb	06585184	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/06 10:30	upstream	8404c9fb	06c27ff5	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/05 21:43	upstream	a79cdfba	06c27ff5	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/05 04:03	upstream	d665ea6e	06c27ff5	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/05/04 13:48	upstream	5e321ded	06c27ff5	.config	log	report	info	KCSAN: data-race in do_signal_stop / do_signal_stop
ci2-upstream-kcsan-gce	2021/01/17 10:04	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/03 00:57	upstream	7cc2a8ea	f30c14bf	.config	log	report
ci2-upstream-kcsan-gce	2020/07/02 06:11	upstream	cd77006e	bed10395	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 02:52	upstream	5e857ce6	bc258b50	.config	log	report