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: 458d, last: 4h44m

Sample crash report:

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

write to 0xffffc90000a63a50 of 4 bytes by task 1127 on cpu 0:
 __pollwake fs/select.c:197 [inline]
 pollwake+0xb9/0x110 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+0x93/0xd0 kernel/sched/wait.c:205
 pipe_write+0x983/0xd00 fs/pipe.c:592
 call_write_iter include/linux/fs.h:2163 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x7bc/0x900 fs/read_write.c:594
 ksys_write+0xd9/0x190 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:656
 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

read to 0xffffc90000a63a50 of 4 bytes by task 1123 on cpu 1:
 poll_schedule_timeout fs/select.c:242 [inline]
 do_select+0xd23/0xe60 fs/select.c:603
 core_sys_select+0x43b/0x6c0 fs/select.c:677
 kern_select fs/select.c:718 [inline]
 __do_sys_select fs/select.c:725 [inline]
 __se_sys_select+0x1a7/0x1e0 fs/select.c:722
 __x64_sys_select+0x63/0x70 fs/select.c:722
 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: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1123 Comm: sshd Not tainted 5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1037):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/09/20 03:58	upstream	20621d2f27a0	70b76c1d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/19 11:43	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/18 22:15	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/18 07:51	upstream	4357f03d6611	70b76c1d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/17 17:26	upstream	ddf21bd8ab98	70b76c1d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/17 14:20	upstream	bdb575f87217	70b76c1d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/17 02:51	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/16 20:45	upstream	ff1ffd71d5f0	aae492f2	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/16 08:34	upstream	ff1ffd71d5f0	07e953c1	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/15 19:52	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/15 06:58	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/14 18:15	upstream	1619b69edce1	07e953c1	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/14 10:38	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/13 19:24	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/13 17:13	upstream	6880fa6c5660	58d09404	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/13 05:09	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/13 05:08	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/12 17:41	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/12 03:28	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/11 12:02	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/10 22:00	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/10 20:44	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/10 02:10	upstream	bf9f243f23e6	e2776ee4	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/09 15:40	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/09 03:42	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/08 10:46	upstream	ac08b1c68d1b	e2776ee4	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/07 22:57	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/07 19:33	upstream	0bcfe68b8767	6ca60148	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/06 23:36	upstream	4b93c544e90e	6ca60148	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/06 10:32	upstream	27151f177827	6ca60148	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/03 12:00	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/02 23:41	upstream	7ba88a2a09f4	f62a5829	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/02 12:16	upstream	4ac6d90867a4	d0f0970b	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/02 08:20	upstream	4ac6d90867a4	7eb7e152	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/09/01 19:03	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/31 16:52	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/31 01:06	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/30 12:14	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/29 22:11	upstream	537b57bd5a20	be2c130d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/28 23:30	upstream	3f5ad13cb012	be2c130d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/28 18:05	upstream	64b4fc45bea6	be2c130d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/28 06:33	upstream	64b4fc45bea6	d5a29e53	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/27 20:19	upstream	1a6436f37512	57b01c6e	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/27 11:28	upstream	77dd11439b86	b318694d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/27 02:43	upstream	1a6d80ff2419	b318694d	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/26 11:36	upstream	73f3af7b4611	b599f2fc	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/25 19:01	upstream	fe67f4dd8daa	b599f2fc	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/08/24 18:38	upstream	6e764bcd1cf7	b599f2fc	.config	log	report	info	KCSAN: data-race in do_select / pollwake
ci2-upstream-kcsan-gce	2021/01/17 10:06	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/06 08:33	upstream	dcb7fd82c75e	ac5a135b	.config	log	report
ci2-upstream-kcsan-gce	2020/07/05 14:06	upstream	35e884f89df4	22f87567	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 14:19	upstream	1b5044021070	3ea11d3f	.config	log	report