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: 360d, last: 22h39m

Sample crash report:

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

write to 0xffff88810179c6e0 of 4 bytes by task 12636 on cpu 1:
 __blkdev_get+0xc1/0x6d0 fs/block_dev.c:1363
 blkdev_get_by_dev+0x9b/0x480 fs/block_dev.c:1451
 blkdev_open+0xb3/0x130 fs/block_dev.c:1546
 do_dentry_open+0x53e/0x830 fs/open.c:826
 vfs_open+0x43/0x50 fs/open.c:940
 do_open fs/namei.c:3361 [inline]
 path_openat+0x184e/0x20b0 fs/namei.c:3494
 do_filp_open+0xd9/0x1f0 fs/namei.c:3521
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1207
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810179c6e0 of 4 bytes by task 1780 on cpu 0:
 __blkdev_put+0x5a/0x460 fs/block_dev.c:1566
 blkdev_put+0x23e/0x2c0 fs/block_dev.c:1636
 blkdev_close+0x47/0x50 fs/block_dev.c:1644
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x56/0x90 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1780 Comm: syz-executor.3 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (194):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/16 18:16	upstream	6b00bc63	c06f97ad	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/15 18:55	upstream	94f0b2d4	8022d7e3	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/14 09:02	upstream	e4e45343	1ba81399	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/13 08:08	upstream	8ecfa36c	1ba81399	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/11 12:25	upstream	06af8679	1ba81399	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/11 00:05	upstream	f09eacca	1ba81399	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/09 09:00	upstream	368094df	5c2fe346	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/09 00:51	upstream	4c8684fe	5c2fe346	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/07 00:09	upstream	decad3e1	500c2339	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/04 12:59	upstream	f88cd3fb	966a236b	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/02 09:07	upstream	231bc539	0740de69	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/06/02 04:58	upstream	231bc539	032639db	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/31 19:32	upstream	c2131f7e	032639db	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/31 01:37	upstream	8124c8a6	325a8dab	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/29 20:02	upstream	f956cb99	325a8dab	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/29 11:28	upstream	6799d4f2	858ea628	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/27 17:46	upstream	d7c5303f	858ea628	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/26 07:27	upstream	ad9f25d3	93d3a9f6	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/25 04:56	upstream	1434a312	3c7fef33	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/24 01:52	upstream	6ebb6814	3c7fef33	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/23 09:50	upstream	4d762034	3c7fef33	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/22 20:07	upstream	23d72926	3c7fef33	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/22 05:09	upstream	45af60e7	3c7fef33	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/21 19:15	upstream	79a106fc	3c7fef33	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/20 20:45	upstream	f01da525	c560a65d	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/20 13:22	upstream	c3d0e3fd	c560a65d	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/17 05:53	upstream	d07f6ca9	f54a5c09	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/16 04:27	upstream	c12a29ed	f54a5c09	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/15 12:58	upstream	25a12987	93f844de	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/14 19:28	upstream	bd3c9cdb	8bdd5343	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/13 15:37	upstream	c06a2ba6	ecb594cb	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/11 07:43	upstream	1140ab59	ca873091	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/10 14:21	upstream	6efb943b	ca873091	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/09 23:29	upstream	9819f682	bc5434be	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/07 10:02	upstream	e4866123	f6da8120	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/07 06:43	upstream	e4866123	06585184	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/06 17:51	upstream	8404c9fb	06585184	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/06 01:00	upstream	a79cdfba	06c27ff5	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/05/01 13:33	upstream	9f67672a	77e2b668	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/04/30 20:30	upstream	65c61de9	77e2b668	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/04/28 23:35	upstream	68a32ba1	77e2b668	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/04/28 06:35	upstream	e359bce3	77e2b668	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/04/28 00:32	upstream	e359bce3	805b5003	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/04/27 14:08	upstream	4a0225c3	805b5003	.config	log	report	info	KCSAN: data-race in __blkdev_get / __blkdev_put
ci2-upstream-kcsan-gce	2021/04/26 09:33	upstream	9f4ad9e4	805b5003	.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	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