KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw

KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue (2)
Status: moderation: reported on 2020/09/05 11:19
Reported-by: syzbot+f5359a7d0291ed059d6a@syzkaller.appspotmail.com
First crash: 256d, last: 3d09h

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue				17	264d	322d	0/21	closed as invalid on 2020/06/18 14:24

Sample crash report:

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

write to 0xffff88810257f010 of 8 bytes by task 2046 on cpu 0:
 __list_add include/linux/list.h:70 [inline]
 list_add include/linux/list.h:86 [inline]
 blk_mq_request_bypass_insert+0x6a/0x130 block/blk-mq.c:1867
 blk_mq_sched_insert_request+0x12c/0x280 block/blk-mq-sched.c:444
 blk_mq_requeue_work+0x38b/0x3f0 block/blk-mq.c:794
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88810257f010 of 8 bytes by task 10990 on cpu 1:
 list_empty_careful include/linux/list.h:319 [inline]
 blk_mq_hctx_has_pending block/blk-mq.c:72 [inline]
 blk_mq_run_hw_queue+0x12e/0x260 block/blk-mq.c:1614
 blk_mq_sched_insert_requests+0x144/0x210 block/blk-mq-sched.c:495
 blk_mq_flush_plug_list+0x2f5/0x400 block/blk-mq.c:1942
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1749
 blk_finish_plug+0x44/0x60 block/blk-core.c:1766
 read_pages+0x3aa/0x6e0 mm/readahead.c:150
 page_cache_ra_unbounded+0x46c/0x4c0 mm/readahead.c:238
 ondemand_readahead+0x560/0x780 mm/readahead.c:267
 page_cache_sync_ra+0x18f/0x1a0 mm/readahead.c:577
 page_cache_sync_readahead include/linux/pagemap.h:840 [inline]
 filemap_get_pages+0x1ba/0x660 mm/filemap.c:2375
 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458
 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609
 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1971 [inline]
 generic_file_splice_read+0x22a/0x310 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10990 Comm: syz-executor.1 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (252):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/03/04 13:15	upstream	f69d02e3	d7e4e604	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/03/04 02:56	upstream	f69d02e3	06ed56cd	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/23 10:26	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/21 12:15	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/20 13:06	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/19 15:34	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/17 20:10	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/17 07:39	upstream	f40ddce8	052f8d9f	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/15 03:47	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/14 12:48	upstream	358fecee	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/14 00:07	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/12 20:36	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/12 20:29	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/11 19:24	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/11 01:12	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/10 09:11	upstream	e0756cfc	9c8b8541	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/08 23:12	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/08 01:00	upstream	b75dba7f	2ce644fc	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/07 14:16	upstream	825b5991	2ce644fc	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/07 00:09	upstream	964d069f	0655e081	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/06 14:19	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/06 10:57	upstream	1e0d27fc	23a562df	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/05 14:16	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/05 05:12	upstream	5c279c4c	23a562df	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/04 01:10	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/02 23:28	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/02 09:05	upstream	88bb507a	19e09687	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/02 07:32	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/01 16:46	upstream	1048ba83	e6b95f32	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/02/01 06:06	upstream	1048ba83	fc9fd31e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/31 15:21	upstream	6642d600	fc9fd31e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/31 02:20	upstream	8c947645	fc9fd31e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/30 09:40	upstream	0e9bcda5	fc9fd31e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/29 20:28	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/29 08:42	upstream	bec4c296	6593fd32	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/28 22:18	upstream	e5ff2cb9	7df34f59	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/28 18:43	upstream	76c057c8	7df34f59	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/28 15:44	upstream	76c057c8	eefc07f2	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/28 02:57	upstream	76c057c8	a57db36f	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/27 07:23	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/26 17:25	upstream	13391c60	55a7d4df	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/25 23:40	upstream	f8ad8187	52e37319	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/25 12:26	upstream	6ee1d745	52e37319	.config	log	report	info	KCSAN: data-race in blk_mq_request_bypass_insert / blk_mq_run_hw_queue
ci2-upstream-kcsan-gce	2021/01/17 11:22	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/04 22:27	upstream	c70672d8	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/09/01 11:12	upstream	b51594df	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/06/24 10:14	upstream	3e08a952	bbad15ae	.config	log	report