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: 269d, last: 4h53m

Sample crash report:

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

write to 0xffff888102804e88 of 8 bytes by task 7640 on cpu 0:
 __list_add include/linux/list.h:72 [inline]
 list_add_tail include/linux/list.h:102 [inline]
 dd_insert_request+0x352/0x530 block/mq-deadline.c:758
 dd_insert_requests+0x10c/0x150 block/mq-deadline.c:777
 blk_mq_sched_insert_requests+0xbe/0x200 block/blk-mq-sched.c:496
 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2291
 blk_flush_plug+0x25a/0x2b0 block/blk-core.c:1593
 blk_finish_plug+0x44/0x60 block/blk-core.c:1617
 read_pages+0x34b/0x5f0 mm/readahead.c:149
 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:238
 ondemand_readahead+0x4f8/0x700
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:579
 page_cache_sync_readahead include/linux/pagemap.h:1029 [inline]
 filemap_get_pages mm/filemap.c:2556 [inline]
 filemap_read+0x3eb/0x16d0 mm/filemap.c:2642
 generic_file_read_iter+0x72/0x2a0 mm/filemap.c:2792
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2156 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102804e88 of 8 bytes by task 244 on cpu 1:
 list_empty_careful include/linux/list.h:321 [inline]
 dd_has_work_for_prio block/mq-deadline.c:836 [inline]
 dd_has_work+0x144/0x260 block/mq-deadline.c:846
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:135 [inline]
 blk_mq_do_dispatch_sched+0x12a/0x6d0 block/blk-mq-sched.c:212
 __blk_mq_sched_dispatch_requests+0x1ca/0x270
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:358
 __blk_mq_run_hw_queue+0xc1/0x140 block/blk-mq.c:1784
 __blk_mq_delay_run_hw_queue+0x199/0x360 block/blk-mq.c:1861
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1914
 blk_mq_run_hw_queues+0x1d1/0x230 block/blk-mq.c:1977
 blk_mq_requeue_work+0x3b4/0x3e0 block/blk-mq.c:1120
 process_one_work+0x3fc/0x980 kernel/workqueue.c:2298
 worker_thread+0x616/0xa70 kernel/workqueue.c:2445
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

value changed: 0xffff888102804e80 -> 0xffff88810296cb48

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 244 Comm: kworker/1:1H Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kblockd blk_mq_requeue_work
==================================================================

Crashes (584):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/27 19:47	upstream	741392771338	63eeac02	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/26 22:22	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/26 10:37	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/25 23:13	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/24 21:36	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/23 22:28	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/22 16:50	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/22 11:33	upstream	136057256686	4eb20a4e	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/21 23:44	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/21 09:39	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/20 19:55	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/20 02:44	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/19 16:04	upstream	4c388a8e740d	3a9d0024	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/19 10:39	upstream	4c388a8e740d	31a30fc0	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/19 01:03	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/18 16:35	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/18 09:23	upstream	42eb8fdac2fc	cafff8b6	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/17 17:19	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/16 22:24	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/16 12:46	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/15 16:22	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/14 23:16	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/14 12:21	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/13 23:25	upstream	a9b9669d9822	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/13 04:07	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/12 14:02	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/12 02:24	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/11 08:16	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/10 19:10	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/10 12:42	upstream	cb690f5238d7	75b04091	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/10 01:56	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/09 14:07	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/09 00:40	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/08 18:51	upstream	e851dfae4371	d29682f1	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/08 13:32	upstream	6b75d88fa81b	d29682f1	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/08 00:29	upstream	6b75d88fa81b	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/07 22:16	upstream	b5013d084e03	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/06 23:56	upstream	512b7931ad05	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/05 19:02	upstream	fe91c4725aee	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/05 06:06	upstream	d4439a1189f9	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/04 09:40	upstream	ce840177930f	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/03 17:26	upstream	dcd68326d29b	4c1be0be	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/03 06:25	upstream	56d33754481f	17f3edd2	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/02 21:08	upstream	bfc484fe6abb	17f3edd2	.config	log	report	info	KCSAN: data-race in dd_has_work / dd_insert_request
ci2-upstream-kcsan-gce	2021/11/02 11:40	upstream	bfc484fe6abb	098b5d53	.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