KCSAN: data-race in __blkdev_get / __blkdev

KCSAN: data-race in __blkdev_get / __blkdev_put
Status: moderation: reported on 2020/09/14 09:29
Reported-by: syzbot+e02873f722605affb544@syzkaller.appspotmail.com
First crash: 259d, last: 14d

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __blkdev_get / __blkdev_put

write to 0xffff888101e0e6e0 of 4 bytes by task 31367 on cpu 0:
 __blkdev_get+0x8c/0x6c0 fs/block_dev.c:1346
 blkdev_get_by_dev+0x103/0x4a0 fs/block_dev.c:1445
 blkdev_open+0xb3/0x130 fs/block_dev.c:1542
 do_dentry_open+0x530/0x890 fs/open.c:817
 vfs_open+0x43/0x50 fs/open.c:931
 do_open fs/namei.c:3254 [inline]
 path_openat+0x1847/0x20a0 fs/namei.c:3371
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888101e0e6e0 of 4 bytes by task 8405 on cpu 1:
 __blkdev_put+0x5a/0x460 fs/block_dev.c:1562
 blkdev_put+0x222/0x2a0 fs/block_dev.c:1632
 blkdev_close+0x47/0x50 fs/block_dev.c:1640
 __fput+0x24e/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0x8e/0x110 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x17c/0x1b0 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:294
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8405 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (123):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/21 07:55	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/02/11 06:43	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/02/10 19:16	upstream	e0756cfc	9c8b8541	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/02/05 21:22	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/02/05 01:41	upstream	5c279c4c	23a562df	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/02/04 16:49	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/02/04 03:11	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/31 03:37	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/28 05:11	upstream	76c057c8	a57db36f	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/27 09:56	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/20 12:28	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/19 06:06	upstream	1e2a199f	63631df1	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/17 18:01	upstream	0da0a8a0	fd103621	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/01/16 20:31	upstream	1d94330a	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/15 03:33	upstream	14662050	468dbb55	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/14 14:10	upstream	65f0d241	269d24e8	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/12 22:38	upstream	e609571b	0cdd6185	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/08 05:58	upstream	f5e6c330	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/07 09:16	upstream	71c061d2	c104d4a3	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 18:03	upstream	36bbbd0e	a0234d98	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/05 01:22	upstream	36bbbd0e	2a28ff1f	.config	log	report	info
ci2-upstream-kcsan-gce	2021/01/02 13:20	upstream	eda809ae	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/31 14:38	upstream	f6e1ea19	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 13:37	upstream	f838f8d2	2242f77f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 05:45	upstream	f838f8d2	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/26 21:35	upstream	40f78232	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/25 14:32	upstream	71c5f031	b982b3ea	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/24 00:45	upstream	58cf05f5	c2c1d1dd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/20 08:22	upstream	467f8165	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/19 17:40	upstream	3644e2d2	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/18 15:27	upstream	a409ed15	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/16 16:30	upstream	d01e7f10	649595c6	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 18:44	upstream	2c85ebc5	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 17:29	upstream	6bff9bb8	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/12 06:09	upstream	7f376f19	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/11 21:41	upstream	33dc9614	ba24ffcd	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 06:38	upstream	7d8761ba	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 20:55	upstream	8100a580	c521566d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/04 22:05	upstream	e87297fa	20366b87	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/02 13:56	upstream	509a1542	eff43e99	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/30 12:00	upstream	b6505459	76831598	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 02:29	upstream	c84e1efa	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/27 10:54	upstream	4df91062	5018c946	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/24 01:01	upstream	418baf2c	878fb17a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/22 10:59	upstream	a349e4c6	0d27f508	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/14 06:40	upstream	84b13499	2d3cdd63	.config	log	report
ci2-upstream-kcsan-gce	2020/06/21 16:58	upstream	64677779	4f2acff9	.config	log	report