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: 365d, last: 3h01m

Sample crash report:

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

write to 0xffffc90001b57c20 of 4 bytes by task 4705 on cpu 1:
 __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+0x80/0xc0 kernel/sched/wait.c:157
 unix_dgram_peer_wake_relay+0xd0/0xf0 net/unix/af_unix.c:373
 __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
 unix_dgram_recvmsg+0x385/0x870 net/unix/af_unix.c:2128
 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:244
 ___sys_recvmsg net/socket.c:2598 [inline]
 do_recvmmsg+0x35c/0x9f0 net/socket.c:2692
 __sys_recvmmsg net/socket.c:2771 [inline]
 __do_sys_recvmmsg net/socket.c:2794 [inline]
 __se_sys_recvmmsg net/socket.c:2787 [inline]
 __x64_sys_recvmmsg+0xcf/0x150 net/socket.c:2787
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffc90001b57c20 of 4 bytes by task 4715 on cpu 0:
 poll_schedule_timeout fs/select.c:242 [inline]
 do_poll fs/select.c:961 [inline]
 do_sys_poll+0x9e2/0xc40 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1117 [inline]
 __se_sys_ppoll+0x169/0x1b0 fs/select.c:1097
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097
 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: 0 PID: 4715 Comm: syz-executor.5 Tainted: G        W         5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (821):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/19 22:56	upstream	913ec3c2	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/19 09:57	upstream	9ed13a17	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/18 20:05	upstream	b1edae0d	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/18 00:53	upstream	fd0aa1a4	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/17 12:13	upstream	70585216	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/16 22:57	upstream	6b00bc63	aba2b2fb	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/16 16:36	upstream	6b00bc63	c06f97ad	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/16 09:49	upstream	94f0b2d4	c06f97ad	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/15 21:42	upstream	94f0b2d4	990d3cbe	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/15 18:48	upstream	94f0b2d4	8022d7e3	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/15 09:41	upstream	009c9aa5	8022d7e3	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/14 09:54	upstream	009c9aa5	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/13 20:47	upstream	e4e45343	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/13 01:32	upstream	8ecfa36c	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/12 11:39	upstream	ad347abe	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/11 22:54	upstream	f21b807c	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/11 09:24	upstream	06af8679	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/10 20:06	upstream	f09eacca	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/10 00:56	upstream	cd1245d7	1ba81399	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/09 13:27	upstream	368094df	84fe5d96	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/09 06:54	upstream	368094df	5c2fe346	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/08 17:48	upstream	4c8684fe	5c2fe346	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/08 08:46	upstream	614124be	5c2fe346	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/07 19:08	upstream	614124be	b718257f	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/07 07:39	upstream	614124be	e59537be	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/06 21:24	upstream	decad3e1	500c2339	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/05 23:56	upstream	f5b6eb1e	500c2339	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/05 10:42	upstream	9d32fa5d	500c2339	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/04 21:58	upstream	16f0596f	500c2339	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/04 17:52	upstream	16f0596f	966a236b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/04 09:28	upstream	f88cd3fb	966a236b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/03 19:39	upstream	f88cd3fb	0740de69	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/02 20:51	upstream	324c92e5	0740de69	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/02 07:22	upstream	231bc539	0740de69	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/06/02 04:53	upstream	231bc539	032639db	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/31 17:14	upstream	c2131f7e	032639db	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/31 09:28	upstream	8124c8a6	032639db	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/31 00:17	upstream	8124c8a6	325a8dab	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/30 06:38	upstream	b90e90f4	325a8dab	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/29 17:28	upstream	f956cb99	325a8dab	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/29 16:01	upstream	6799d4f2	325a8dab	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/05/29 08:37	upstream	6799d4f2	858ea628	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/17 10:56	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/18 19:22	upstream	6cf7ccba	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/14 20:16	upstream	e9919e11	6f458026	.config	log	report
ci2-upstream-kcsan-gce	2020/06/19 12:55	upstream	5e857ce6	bc258b50	.config	log	report