KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass

KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
Status: moderation: reported on 2020/12/07 11:25
Reported-by: syzbot+cbd503fe55400f0ef6f1@syzkaller.appspotmail.com
First crash: 530d, last: 6d10h

Sample crash report:

==================================================================
BUG: KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert

write to 0xffff888101f6b010 of 8 bytes by task 39 on cpu 1:
 __list_add include/linux/list.h:72 [inline]
 list_add include/linux/list.h:88 [inline]
 blk_mq_request_bypass_insert+0x6a/0x130 block/blk-mq.c:2164
 blk_mq_sched_insert_request+0xfd/0x220 block/blk-mq-sched.c:460
 blk_mq_requeue_work+0x217/0x3e0 block/blk-mq.c:1112
 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

read to 0xffff888101f6b010 of 8 bytes by task 23341 on cpu 0:
 list_empty_careful include/linux/list.h:321 [inline]
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:138 [inline]
 blk_mq_do_dispatch_sched+0x167/0x6d0 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:1785
 __blk_mq_delay_run_hw_queue+0x199/0x360 block/blk-mq.c:1862
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1915
 blk_mq_sched_insert_requests+0x130/0x200 block/blk-mq-sched.c:511
 blk_mq_flush_plug_list+0x372/0x460 block/blk-mq.c:2292
 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+0xa72/0x1200 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: 0xffff888101f6b008 -> 0xffff888102a03f48

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23341 Comm: syz-executor.3 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (141):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/12/02 03:53	upstream	58e1100fdc59	61f86278	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/30 23:09	upstream	f080815fdb3e	80270552	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/28 02:17	upstream	741392771338	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/26 23:01	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/26 11:47	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/26 03:03	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/24 20:31	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/23 18:53	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/15 14:46	upstream	8ab774587903	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/11 23:39	upstream	ca2ef2d9f2aa	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/11 08:58	upstream	debe436e77c7	75b04091	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/11/10 07:01	upstream	cb690f5238d7	55fa030c	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/10/31 07:01	upstream	119c85055d86	098b5d53	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/10/25 20:34	upstream	87066fdd2e30	c1132b49	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/10/24 02:36	upstream	9c0c4d24ac00	282f03fb	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/10/13 13:00	upstream	f4d0cc426f77	9d56e7dd	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/10/13 05:15	upstream	f4d0cc426f77	08362356	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/10/02 23:36	upstream	ab2a7a35c4e7	db0f5787	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/26 11:21	upstream	a3b397b4fffb	8cac236e	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/25 07:27	upstream	7d42e9818258	8cac236e	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/22 19:12	upstream	cf1d2c3e7e2f	8cac236e	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/21 02:36	upstream	e8f71f89236e	af796c18	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/17 13:43	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/15 19:09	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/09/01 06:26	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/08/31 03:51	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/08/22 17:56	upstream	9ff50bf2f2ff	b599f2fc	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/08/09 06:50	upstream	66745863ecde	6972b106	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/08/05 19:47	upstream	e04480920d1e	d2d6e680	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/08/01 03:51	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/07/22 23:13	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/07/18 19:36	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/07/14 07:26	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/07/08 19:40	upstream	3dbdb38e2869	1b20171a	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/07/01 13:45	upstream	dbe69e433722	658ebc66	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/30 17:49	upstream	007b350a5875	84fd4c77	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/29 13:20	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/26 20:32	upstream	625acffd7ae2	9d2ab5df	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/23 01:44	upstream	0c18f29aae7c	aba2b2fb	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/18 18:07	upstream	fd0aa1a4567d	aba2b2fb	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/17 16:56	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/06/16 17:03	upstream	6b00bc639f1f	c06f97ad	.config	log	report	info	KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
ci2-upstream-kcsan-gce	2021/01/17 11:10	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/06 20:03	upstream	8100a58044f8	c521566d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/06/25 19:17	upstream	908f7d12d3ba	adb7d9e6	.config	log	report