KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch

KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests (3)
Status: moderation: reported on 2020/01/10 21:14
Reported-by: syzbot+44f9b37d2de57637dbfd@syzkaller.appspotmail.com
First crash: 738d, last: 5h02m

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests (2)				31	739d	774d	0/22	closed as invalid on 2019/11/19 14:04
upstream	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests				1	775d	775d	0/22	closed as invalid on 2019/10/15 15:50

Sample crash report:

==================================================================
BUG: KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests

read to 0xffff888101d01758 of 8 bytes by task 3349 on cpu 1:
 blk_mq_sched_dispatch_requests+0x7e/0x110 block/blk-mq-sched.c:352
 __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_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511
 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
 __iomap_dio_rw+0xcad/0x1070 fs/iomap/direct-io.c:597
 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:679
 ext4_dio_write_iter fs/ext4/file.c:568 [inline]
 ext4_file_write_iter+0xac3/0x1200 fs/ext4/file.c:679
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 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

write to 0xffff888101d01758 of 8 bytes by task 3352 on cpu 0:
 blk_mq_sched_dispatch_requests+0x90/0x110 block/blk-mq-sched.c:352
 __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_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511
 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
 __iomap_dio_rw+0xcad/0x1070 fs/iomap/direct-io.c:597
 iomap_dio_rw+0x38/0x80 fs/iomap/direct-io.c:679
 ext4_dio_write_iter fs/ext4/file.c:568 [inline]
 ext4_file_write_iter+0xac3/0x1200 fs/ext4/file.c:679
 call_write_iter include/linux/fs.h:2162 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_iter_write+0x4c/0x70 fs/read_write.c:892
 iter_file_splice_write+0x43a/0x790 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 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

value changed: 0x00000000000013c4 -> 0x00000000000013c5

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3352 Comm: syz-executor.0 Not tainted 5.16.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
syz-executor.0 (3352) used greatest stack depth: 10544 bytes left

Crashes (1822):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/27 19:13	upstream	741392771338	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/26 22:21	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/26 08:40	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/25 19:15	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/25 17:36	upstream	5f53fa508db0	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/24 19:01	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/23 22:45	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/22 13:01	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/22 11:39	upstream	136057256686	4eb20a4e	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/21 22:11	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/21 09:13	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/20 19:57	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/20 03:09	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/19 14:16	upstream	4c388a8e740d	3a9d0024	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/19 10:29	upstream	4c388a8e740d	31a30fc0	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/18 21:44	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/18 13:56	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/18 06:40	upstream	42eb8fdac2fc	cafff8b6	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/17 17:17	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/16 22:02	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/16 10:00	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/15 11:10	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/14 21:59	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/14 09:28	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/13 19:46	upstream	a9b9669d9822	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/13 02:05	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/12 14:30	upstream	5833291ab6de	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/11 23:44	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/11 07:35	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/10 18:09	upstream	89d714ab6043	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/10 12:33	upstream	cb690f5238d7	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/10 01:13	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/09 13:56	upstream	d2f38a3c6507	59bcaf9a	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/09 00:27	upstream	e851dfae4371	8ab17e57	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/08 18:14	upstream	e851dfae4371	d29682f1	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/08 11:48	upstream	6b75d88fa81b	d29682f1	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/08 00:06	upstream	6b75d88fa81b	4c1be0be	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/07 10:57	upstream	b5013d084e03	4c1be0be	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/06 22:13	upstream	512b7931ad05	4c1be0be	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/05 19:22	upstream	fe91c4725aee	4c1be0be	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/05 06:17	upstream	d4439a1189f9	4c1be0be	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/11/04 16:41	upstream	7ddb58cb0eca	4c1be0be	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/01/17 10:06	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/01/10 15:24	https://github.com/google/ktsan.git kcsan	245a43005292	532ec44e	.config	log	report
ci2-upstream-kcsan-gce	2020/01/06 20:57	https://github.com/google/ktsan.git kcsan	245a43005292	53430d97	.config	log	report
ci2-upstream-kcsan-gce	2019/11/20 22:33	https://github.com/google/ktsan.git kcsan	5863cc791e4c	8098ea0f	.config	log	report