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: 260d, last: 20h07m

Sample crash report:

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

write to 0xffffc900016cfc40 of 4 bytes by task 10361 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+0x382/0x840 net/unix/af_unix.c:2127
 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:234
 ___sys_recvmsg net/socket.c:2611 [inline]
 do_recvmmsg+0x34c/0x9e0 net/socket.c:2705
 __sys_recvmmsg net/socket.c:2784 [inline]
 __do_sys_recvmmsg net/socket.c:2807 [inline]
 __se_sys_recvmmsg net/socket.c:2800 [inline]
 __x64_sys_recvmmsg+0xcf/0x150 net/socket.c:2800
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffc900016cfc40 of 4 bytes by task 10364 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:1119 [inline]
 __se_sys_ppoll+0x169/0x1b0 fs/select.c:1099
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1099
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10364 Comm: syz-executor.3 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (609):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/03/06 07:56	upstream	a38fd874	e4b4d570	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/03/05 18:17	upstream	280d542f	4a024a9b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/03/05 07:04	upstream	280d542f	9d751681	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/03/04 21:33	upstream	cee407c5	f89ed068	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/03/04 18:04	upstream	f69d02e3	f89ed068	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/03/04 08:50	upstream	f69d02e3	d7e4e604	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/03/03 17:24	upstream	f69d02e3	06ed56cd	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/24 10:42	upstream	c03c21ba	fcc6d71b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/23 16:24	upstream	3b9cdafb	fcc6d71b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/23 02:29	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/22 15:55	upstream	31caf8b2	c26fb06b	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/22 09:06	upstream	31caf8b2	a659b3f1	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/21 19:25	upstream	55f62bc8	a659b3f1	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/21 04:45	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/20 10:45	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/19 16:04	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/17 19:54	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/17 07:11	upstream	f40ddce8	052f8d9f	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/15 01:56	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/14 12:35	upstream	358fecee	98682e5e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/13 22:37	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/13 08:51	upstream	c6d8570e	98682e5e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/12 19:18	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/12 07:57	upstream	dcc0b490	a5f86b15	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/11 19:06	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/10 22:05	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/10 08:26	upstream	e0756cfc	9c8b8541	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/08 21:50	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/08 12:50	upstream	92bf2261	2ce644fc	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/07 21:59	upstream	b75dba7f	2ce644fc	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/07 08:41	upstream	825b5991	2ce644fc	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/06 23:35	upstream	964d069f	0655e081	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/06 14:24	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/06 11:49	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/06 02:50	upstream	1e0d27fc	23a562df	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/05 12:49	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/05 02:41	upstream	5c279c4c	23a562df	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/04 12:47	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/03 20:46	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/02 23:24	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/02 09:41	upstream	88bb507a	19e09687	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/01 19:58	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/01 13:39	upstream	1048ba83	e6b95f32	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/02/01 02:20	upstream	1048ba83	fc9fd31e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/31 12:03	upstream	6642d600	fc9fd31e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/30 23:09	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/30 08:48	upstream	0e9bcda5	fc9fd31e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/29 19:45	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/29 09:45	upstream	bec4c296	6593fd32	.config	log	report	info	KCSAN: data-race in do_sys_poll / pollwake
ci2-upstream-kcsan-gce	2021/01/28 19:41	upstream	e5ff2cb9	7df34f59	.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