KCSAN: data-race in do_select / pollwake

KCSAN: data-race in do_select / pollwake
Status: moderation: reported on 2020/07/06 15:42
Reported-by: syzbot+5a0758690f26e1909c08@syzkaller.appspotmail.com
First crash: 366d, last: 41m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in do_select / pollwake

write to 0xffffc9000013ba50 of 4 bytes by task 1749 on cpu 0:
 __pollwake fs/select.c:197 [inline]
 pollwake+0xa7/0xf0 fs/select.c:217
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:108
 __wake_up_common_lock kernel/sched/wait.c:138 [inline]
 __wake_up_sync_key+0x83/0xc0 kernel/sched/wait.c:205
 pipe_write+0x944/0xca0 fs/pipe.c:580
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x69d/0x770 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffc9000013ba50 of 4 bytes by task 1739 on cpu 1:
 poll_schedule_timeout fs/select.c:242 [inline]
 do_select+0xeaa/0xf80 fs/select.c:603
 core_sys_select+0x403/0x690 fs/select.c:677
 kern_select fs/select.c:718 [inline]
 __do_sys_select fs/select.c:725 [inline]
 __se_sys_select+0x17e/0x1c0 fs/select.c:722
 __x64_sys_select+0x63/0x70 fs/select.c:722
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1739 Comm: sshd Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (848):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/20 00:21	upstream	913ec3c2	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/19 09:51	upstream	9ed13a17	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/18 20:11	upstream	b1edae0d	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/18 04:48	upstream	fd0aa1a4	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/17 13:23	upstream	70585216	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/17 03:10	upstream	6b00bc63	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/16 17:28	upstream	6b00bc63	c06f97ad	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/16 15:16	upstream	94f0b2d4	c06f97ad	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/15 23:03	upstream	94f0b2d4	990d3cbe	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/15 19:59	upstream	94f0b2d4	8022d7e3	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/15 09:29	upstream	009c9aa5	8022d7e3	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/14 12:33	upstream	009c9aa5	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/13 21:11	upstream	e4e45343	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/13 06:07	upstream	8ecfa36c	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/12 18:31	upstream	ad347abe	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/11 22:32	upstream	f21b807c	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/11 10:51	upstream	06af8679	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/10 21:01	upstream	f09eacca	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/10 03:22	upstream	cd1245d7	1ba81399	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/09 13:02	upstream	368094df	84fe5d96	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/09 07:17	upstream	368094df	5c2fe346	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/08 18:21	upstream	4c8684fe	5c2fe346	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/08 09:05	upstream	614124be	5c2fe346	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/07 23:34	upstream	614124be	b718257f	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/07 07:37	upstream	614124be	e59537be	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/06 21:30	upstream	decad3e1	500c2339	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/06 01:01	upstream	f5b6eb1e	500c2339	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/05 10:59	upstream	9d32fa5d	500c2339	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/04 21:46	upstream	16f0596f	500c2339	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/04 18:54	upstream	16f0596f	966a236b	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/04 11:47	upstream	f88cd3fb	966a236b	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/03 21:08	upstream	f88cd3fb	0740de69	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/02 21:26	upstream	324c92e5	0740de69	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/02 17:19	upstream	231bc539	0740de69	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/06/02 04:35	upstream	231bc539	032639db	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/31 17:14	upstream	c2131f7e	032639db	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/31 12:34	upstream	8124c8a6	032639db	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/31 00:00	upstream	8124c8a6	325a8dab	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/30 08:01	upstream	b90e90f4	325a8dab	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/30 01:02	upstream	f956cb99	325a8dab	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/29 10:38	upstream	6799d4f2	858ea628	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/28 20:06	upstream	5ff2756a	858ea628	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/28 06:27	upstream	97e5bf60	858ea628	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/27 15:19	upstream	d7c5303f	858ea628	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/27 01:56	upstream	7ac3a1c1	858ea628	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/26 10:08	upstream	ad9f25d3	750ce164	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/25 19:28	upstream	a050a6d2	93d3a9f6	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/05/25 03:10	upstream	1434a312	3c7fef33	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/01/17 10:06	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/06 08:33	upstream	dcb7fd82	ac5a135b	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 14:06	upstream	35e884f8	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 14:19	upstream	1b504402	3ea11d3f	.config	log	report