KCSAN: data-race in do_sys

KCSAN: data-race in do_sys_poll / pollwake
Status: moderation: reported on 2020/07/18 20:22
Reported-by: syzbot+a5d15da12b55f807031f@syzkaller.appspotmail.com
First crash: 457d, last: 1h21m

Sample crash report:

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

write to 0xffffc90000dcfc20 of 4 bytes by task 5980 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+0x80/0xc0 kernel/sched/wait.c:157
 unix_dgram_peer_wake_relay+0xd0/0xf0 net/unix/af_unix.c:381
 __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
 __unix_dgram_recvmsg+0x3cb/0x8c0 net/unix/af_unix.c:2293
 unix_dgram_recvmsg+0x32/0x40 net/unix/af_unix.c:2364
 ____sys_recvmsg+0x16c/0x320
 ___sys_recvmsg net/socket.c:2670 [inline]
 do_recvmmsg+0x3f5/0xae0 net/socket.c:2764
 __sys_recvmmsg net/socket.c:2843 [inline]
 __do_sys_recvmmsg net/socket.c:2866 [inline]
 __se_sys_recvmmsg net/socket.c:2859 [inline]
 __x64_sys_recvmmsg+0xde/0x160 net/socket.c:2859
 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 0xffffc90000dcfc20 of 4 bytes by task 5975 on cpu 1:
 poll_schedule_timeout fs/select.c:242 [inline]
 do_poll fs/select.c:961 [inline]
 do_sys_poll+0x82f/0xad0 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1117 [inline]
 __se_sys_ppoll+0x18b/0x1d0 fs/select.c:1097
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097
 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: 5975 Comm: syz-executor.2 Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1050):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/09/20 07:59	upstream	e4e737bb5c17	3d9c9a2a	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/19 23:25	upstream	20621d2f27a0	70b76c1d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/19 10:26	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/18 20:38	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/18 05:51	upstream	4357f03d6611	70b76c1d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/17 16:44	upstream	ddf21bd8ab98	70b76c1d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/17 14:02	upstream	bdb575f87217	70b76c1d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/17 02:01	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/16 13:40	upstream	ff1ffd71d5f0	aae492f2	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/16 08:24	upstream	ff1ffd71d5f0	07e953c1	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/15 19:06	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/15 05:56	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/14 15:34	upstream	d0ee23f9d78b	07e953c1	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/14 08:24	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/13 19:10	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/13 16:59	upstream	6880fa6c5660	58d09404	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/13 02:00	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/12 13:02	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/12 12:59	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/12 00:22	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/11 10:46	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/10 21:15	upstream	e99f23c5bf59	5ae8508a	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/10 09:35	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/10 01:18	upstream	bf9f243f23e6	e2776ee4	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/09 12:27	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/08 23:01	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/08 09:57	upstream	ac08b1c68d1b	e2776ee4	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/07 21:06	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/07 19:24	upstream	0bcfe68b8767	6ca60148	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/06 23:19	upstream	4b93c544e90e	6ca60148	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/06 10:01	upstream	27151f177827	6ca60148	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/03 10:45	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/02 21:56	upstream	4ac6d90867a4	f62a5829	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/02 09:51	upstream	4ac6d90867a4	d0f0970b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/02 08:09	upstream	4ac6d90867a4	7eb7e152	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/09/01 18:28	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/31 14:55	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/31 12:19	upstream	b91db6a0b52e	8f58a0ef	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/30 22:57	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/30 09:48	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/29 21:32	upstream	537b57bd5a20	be2c130d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/28 19:09	upstream	3f5ad13cb012	be2c130d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/28 17:08	upstream	64b4fc45bea6	be2c130d	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/28 05:42	upstream	64b4fc45bea6	d5a29e53	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/08/27 18:57	upstream	1a6436f37512	57b01c6e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/17 10:56	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/18 19:22	upstream	6cf7ccba29dc	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/14 20:16	upstream	e9919e11e219	6f458026	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 12:55	upstream	5e857ce6eae7	bc258b50	.config	log	report