KCSAN: data-race in dd_has_work / dd_insert

KCSAN: data-race in dd_has_work / dd_insert_request
Status: moderation: reported on 2021/03/30 11:56
Reported-by: syzbot+7cd16c2f3f9c292c2ae7@syzkaller.appspotmail.com
First crash: 155d, last: 1h22m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in dd_has_work / dd_insert_request

write to 0xffff888101dcca90 of 8 bytes by task 15207 on cpu 1:
 __list_add include/linux/list.h:70 [inline]
 list_add_tail include/linux/list.h:100 [inline]
 dd_insert_request+0x31f/0x4c0 block/mq-deadline-main.c:768
 dd_insert_requests+0xfe/0x170 block/mq-deadline-main.c:787
 blk_mq_sched_insert_request+0x1fc/0x250 block/blk-mq-sched.c:470
 blk_mq_submit_bio+0x524/0xe80 block/blk-mq.c:2263
 __submit_bio_noacct_mq block/blk-core.c:1011 [inline]
 submit_bio_noacct+0x6f2/0x7e0 block/blk-core.c:1044
 submit_bio+0x10c/0x190 include/linux/vmstat.h:81
 submit_bh_wbc+0x2f3/0x330 fs/buffer.c:3050
 submit_bh fs/buffer.c:3056 [inline]
 __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3151
 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3164
 fat_set_state+0x180/0x1d0 fs/fat/inode.c:709
 fat_fill_super+0x263a/0x2a80 fs/fat/inode.c:1885
 vfat_fill_super+0x2c/0x40 fs/fat/namei_vfat.c:1051
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 vfat_mount+0x2d/0x40 fs/fat/namei_vfat.c:1058
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x11d4/0x1ce0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888101dcca90 of 8 bytes by task 1000 on cpu 0:
 list_empty_careful include/linux/list.h:319 [inline]
 dd_has_work_for_prio block/mq-deadline-main.c:841 [inline]
 dd_has_work+0x187/0x260 block/mq-deadline-main.c:850
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:137 [inline]
 blk_mq_do_dispatch_sched+0x12a/0x640 block/blk-mq-sched.c:214
 __blk_mq_sched_dispatch_requests+0x1eb/0x290 block/blk-mq-sched.c:329
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1500
 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1832
 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276
 worker_thread+0x636/0xae0 kernel/workqueue.c:2422
 kthread+0x262/0x280 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

value changed: 0xffff888101dcca88 -> 0xffff888101e66348

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1000 Comm: kworker/0:1H Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kblockd blk_mq_run_work_fn
==================================================================

Crashes (337):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 17:46	upstream	251a1524293d	d2d6e680	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/08/05 05:20	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/08/04 20:50	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/08/04 16:05	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/08/03 17:19	upstream	d5ad8ec3cfb5	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/08/02 11:04	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/08/01 20:02	upstream	d4affd6b6e81	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/31 21:33	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/31 08:26	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/30 19:06	upstream	4669e13cd67f	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/30 17:00	upstream	764a5bc89b12	6c236867	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/30 04:37	upstream	7e96bf476270	c585c7b0	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/29 16:38	upstream	4010a528219e	8a799410	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/29 04:17	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/28 20:42	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/28 16:25	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/27 21:45	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/27 15:40	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/26 06:02	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/25 13:25	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/25 00:03	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/24 09:38	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/24 03:49	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/23 14:35	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/23 00:14	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/22 12:05	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/22 09:44	upstream	3d5895cd3517	29c3f20f	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/21 20:09	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/21 13:00	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/20 12:09	upstream	2734d6c1b1a0	1b201b48	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/19 22:29	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/19 10:15	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/19 08:22	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/18 19:40	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/18 01:04	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/17 15:29	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/17 02:34	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/16 09:52	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/15 20:45	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/15 01:05	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/14 17:00	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/14 12:09	upstream	40226a3d96ef	94e0b707	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/14 02:11	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/13 19:46	upstream	40226a3d96ef	70168d5c	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/13 12:51	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/07/12 21:00	upstream	7fef2edf7cc7	f415556d	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/03/29 20:13	upstream	1e43c377a79f	6a81331a	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/03/26 11:46	upstream	db24726bfefa	a8529b82	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/03/03 18:27	upstream	f69d02e37a85	06ed56cd	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request