KCSAN: data-race in exit_signals / mm_update_next

KCSAN: data-race in exit_signals / mm_update_next_owner (4)
Status: auto-closed as invalid on 2021/07/07 06:50
Reported-by: syzbot+66ebc4dba60062669bed@syzkaller.appspotmail.com
First crash: 404d, last: 56d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in exit_signals / mm_update_next_owner (3)	15	424d	561d	0/22	closed as invalid on 2020/06/18 14:24
upstream	KCSAN: data-race in exit_signals / mm_update_next_owner	2	636d	641d	0/22	closed as invalid on 2019/11/19 13:24
upstream	KCSAN: data-race in exit_signals / mm_update_next_owner (2)	4	585d	611d	0/22	closed as invalid on 2020/01/09 14:13

Sample crash report:

==================================================================
BUG: KCSAN: data-race in exit_signals / mm_update_next_owner

write to 0xffff888146bc502c of 4 bytes by task 526 on cpu 1:
 exit_signals+0xe1/0x4a0 kernel/signal.c:2927
 do_exit+0x194/0x1560 kernel/exit.c:782
 do_group_exit+0x19b/0x1a0 kernel/exit.c:923
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:934
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:932
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:932
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888146bc502c of 4 bytes by task 535 on cpu 0:
 mm_update_next_owner+0x1d9/0x520 kernel/exit.c:389
 exit_mm+0x358/0x450 kernel/exit.c:501
 do_exit+0x3ff/0x1560 kernel/exit.c:813
 do_group_exit+0x19b/0x1a0 kernel/exit.c:923
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:934
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:932
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:932
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00404040 -> 0x00404044

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 535 Comm: syz-executor.5 Not tainted 5.13.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (133):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/02 06:50	upstream	231bc5390667	032639db	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/30 07:19	upstream	b90e90f40b4f	325a8dab	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/28 22:40	upstream	5ff2756afde0	858ea628	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/28 09:42	upstream	97e5bf604b7a	858ea628	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/26 13:50	upstream	ad9f25d33860	750ce164	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/25 08:08	upstream	1434a3127887	3c7fef33	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/24 02:16	upstream	6ebb6814a1ef	3c7fef33	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/23 16:20	upstream	4d7620341eda	3c7fef33	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/21 19:09	upstream	79a106fc6585	3c7fef33	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/19 19:21	upstream	c3d0e3fd41b7	a343ba6b	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/18 03:47	upstream	8ac91e6c6033	a343ba6b	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/15 07:34	upstream	25a1298726e9	8bdd5343	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/14 22:02	upstream	bd3c9cdb21a2	8bdd5343	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/14 05:06	upstream	315d99318179	8bdd5343	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/10 03:36	upstream	9819f682e48c	bc5434be	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/08 12:10	upstream	dd860052c99b	bc5434be	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/07 09:08	upstream	e48661230cc3	f6da8120	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/04 18:18	upstream	5e321ded302d	06c27ff5	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/05/01 11:03	upstream	9f67672a817e	77e2b668	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/29 16:24	upstream	d72cd4ad4174	77e2b668	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/28 13:27	upstream	e359bce39d90	77e2b668	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/27 13:34	upstream	4a0225c3d208	805b5003	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/27 06:42	upstream	9f4ad9e425a1	8ee2dea6	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/26 12:26	upstream	9f4ad9e425a1	805b5003	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/22 12:21	upstream	16fc44d6387e	33c28d03	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/22 00:02	upstream	16fc44d6387e	2bc8999a	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/21 13:04	upstream	1fe5501ba1ab	95777977	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/18 13:26	upstream	c98ff1d013d2	7e2b734b	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/17 08:43	upstream	9cdbf6467424	7e2b734b	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/16 08:01	upstream	7e25f40eab52	c59079a6	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/15 18:59	upstream	7f75285ca572	c59079a6	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/15 00:38	upstream	7f75285ca572	fcdb12ba	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/04 02:03	upstream	d93a0d43e3d0	6a81331a	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/01 19:51	upstream	ffd9fb546d49	6a81331a	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/04/01 05:57	upstream	d19cc4bfbff1	6a81331a	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/03/30 21:10	upstream	2bb25b3a748a	6a81331a	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/03/25 16:41	upstream	e138138003eb	6a383ecf	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/03/19 17:22	upstream	8b12a62a4e3e	2af9d324	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/03/11 04:52	upstream	a74e6a014c9d	c2ca1f2a	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/03/10 19:39	upstream	05a59d79793d	764067f3	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/02/14 04:50	upstream	ac30d8ce28d6	98682e5e	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/02/02 07:42	upstream	88bb507a74ea	e6b95f32	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/02/01 19:04	upstream	1048ba83fb1c	e6b95f32	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/01/31 14:36	upstream	6642d600b541	fc9fd31e	.config	log	report	info	KCSAN: data-race in exit_signals / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/01/17 05:50	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/12 06:49	upstream	3d5e28bff7ad	cca87986	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/19 00:44	upstream	1b5044021070	3ea11d3f	.config	log	report