KCSAN: data-race in exit_mm / mm_update_next

KCSAN: data-race in exit_mm / mm_update_next_owner
Status: moderation: reported on 2020/07/04 18:12
Reported-by: syzbot+dfcff47717996ec0ac40@syzkaller.appspotmail.com
First crash: 458d, last: 1h10m

Sample crash report:

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

write to 0xffff8881089414c0 of 8 bytes by task 16563 on cpu 0:
 exit_mm+0x28d/0x3e0 kernel/exit.c:494
 do_exit+0x3ef/0x14a0 kernel/exit.c:812
 do_group_exit+0xce/0x1a0 kernel/exit.c:922
 get_signal+0xf93/0x15d0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x8c/0x280 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881089414c0 of 8 bytes by task 16554 on cpu 1:
 mm_update_next_owner+0x233/0x4f0 kernel/exit.c:391
 exit_mm+0x2e4/0x3e0 kernel/exit.c:500
 do_exit+0x3ef/0x14a0 kernel/exit.c:812
 do_group_exit+0x19b/0x1a0 kernel/exit.c:922
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888129282a80 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16554 Comm: syz-executor.0 Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (971):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/09/20 08:04	upstream	e4e737bb5c17	3d9c9a2a	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/19 23:26	upstream	20621d2f27a0	70b76c1d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/19 10:16	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/18 20:46	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/18 05:59	upstream	4357f03d6611	70b76c1d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/17 17:21	upstream	ddf21bd8ab98	70b76c1d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/17 16:00	upstream	bdb575f87217	70b76c1d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/17 02:08	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/16 15:21	upstream	ff1ffd71d5f0	aae492f2	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/16 08:22	upstream	ff1ffd71d5f0	07e953c1	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/15 19:10	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/15 06:03	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/14 18:56	upstream	1619b69edce1	07e953c1	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/14 09:45	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/13 19:55	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/13 02:27	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/12 13:12	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/12 01:12	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/11 12:13	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/11 00:01	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/10 20:56	upstream	e99f23c5bf59	5ae8508a	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/10 10:14	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/10 01:28	upstream	bf9f243f23e6	e2776ee4	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/09 13:31	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/09 01:19	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/08 09:58	upstream	ac08b1c68d1b	e2776ee4	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/08 01:20	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/07 19:10	upstream	0bcfe68b8767	6ca60148	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/07 00:48	upstream	4b93c544e90e	6ca60148	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/06 11:29	upstream	27151f177827	6ca60148	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/03 10:39	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/02 22:52	upstream	7ba88a2a09f4	f62a5829	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/02 21:51	upstream	4ac6d90867a4	f62a5829	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/02 09:51	upstream	4ac6d90867a4	d0f0970b	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/02 07:53	upstream	4ac6d90867a4	7eb7e152	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/09/01 18:45	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/08/31 14:47	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/08/31 00:03	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/08/30 10:22	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/08/29 22:04	upstream	537b57bd5a20	be2c130d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/08/28 19:20	upstream	3f5ad13cb012	be2c130d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/08/28 17:08	upstream	64b4fc45bea6	be2c130d	.config	log	report	info	KCSAN: data-race in exit_mm / mm_update_next_owner
ci2-upstream-kcsan-gce	2021/01/17 10:58	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/04 13:08	upstream	35e884f89df4	4f739670	.config	log	report
ci2-upstream-kcsan-gce	2020/06/30 18:03	upstream	7c30b859a947	917afeaa	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 02:44	upstream	5e857ce6eae7	bc258b50	.config	log	report