KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx

KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
Status: moderation: reported on 2020/07/01 15:52
Reported-by: syzbot+49a9bcf457723ecaf1cf@syzkaller.appspotmail.com
First crash: 261d, last: 21h20m

Sample crash report:

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

write to 0xffff888102ef8548 of 8 bytes by task 13453 on cpu 1:
 blk_mq_rq_ctx_init+0x3ec/0x4f0 block/blk-mq.c:344
 __blk_mq_alloc_request+0x2a5/0x2c0 block/blk-mq.c:398
 blk_mq_submit_bio+0x299/0x1060 block/blk-mq.c:2190
 __submit_bio_noacct_mq block/blk-core.c:1014 [inline]
 submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047
 submit_bio+0x200/0x370 block/blk-core.c:1118
 iomap_dio_submit_bio fs/iomap/direct-io.c:76 [inline]
 iomap_dio_bio_actor+0x92d/0xb60 fs/iomap/direct-io.c:342
 iomap_dio_actor+0x26e/0x3b0 fs/iomap/direct-io.c:417
 iomap_apply+0x1e1/0x4a0 fs/iomap/apply.c:84
 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xe5d/0x10b0 fs/ext4/file.c:661
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102ef8548 of 8 bytes by task 13455 on cpu 0:
 blk_mq_rq_ctx_init+0x3da/0x4f0 block/blk-mq.c:344
 __blk_mq_alloc_request+0x2a5/0x2c0 block/blk-mq.c:398
 blk_mq_submit_bio+0x299/0x1060 block/blk-mq.c:2190
 __submit_bio_noacct_mq block/blk-core.c:1014 [inline]
 submit_bio_noacct+0x7c2/0x9a0 block/blk-core.c:1047
 submit_bio+0x200/0x370 block/blk-core.c:1118
 iomap_dio_submit_bio fs/iomap/direct-io.c:76 [inline]
 iomap_dio_bio_actor+0x92d/0xb60 fs/iomap/direct-io.c:342
 iomap_dio_actor+0x26e/0x3b0 fs/iomap/direct-io.c:417
 iomap_apply+0x1e1/0x4a0 fs/iomap/apply.c:84
 __iomap_dio_rw+0x4c4/0xa30 fs/iomap/direct-io.c:553
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641
 ext4_dio_write_iter fs/ext4/file.c:551 [inline]
 ext4_file_write_iter+0xe5d/0x10b0 fs/ext4/file.c:661
 call_write_iter include/linux/fs.h:1977 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6f9/0x7e0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 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: 0 PID: 13455 Comm: syz-executor.0 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (931):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/03/06 06:33	upstream	a38fd874	e4b4d570	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/03/05 19:37	upstream	280d542f	4a024a9b	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/03/05 06:06	upstream	280d542f	9d751681	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/03/04 20:37	upstream	cee407c5	f89ed068	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/03/04 17:38	upstream	f69d02e3	f89ed068	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/03/04 05:49	upstream	f69d02e3	d7e4e604	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/03/03 17:10	upstream	f69d02e3	06ed56cd	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/24 05:45	upstream	c03c21ba	fcc6d71b	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/23 16:16	upstream	3b9cdafb	fcc6d71b	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/23 02:57	upstream	b12b4724	fcc6d71b	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/22 13:12	upstream	31caf8b2	c26fb06b	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/22 07:58	upstream	31caf8b2	a659b3f1	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/21 18:20	upstream	55f62bc8	a659b3f1	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/21 04:43	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/20 09:53	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/19 15:13	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/17 19:07	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/17 07:11	upstream	f40ddce8	052f8d9f	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/15 01:37	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/14 12:28	upstream	358fecee	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/13 22:22	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/13 09:03	upstream	c6d8570e	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/12 19:08	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/12 07:11	upstream	dcc0b490	a5f86b15	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/11 18:00	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/10 21:47	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/10 08:44	upstream	e0756cfc	9c8b8541	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/08 21:27	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/08 11:14	upstream	92bf2261	2ce644fc	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/07 22:10	upstream	b75dba7f	2ce644fc	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/07 08:35	upstream	825b5991	2ce644fc	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/06 23:16	upstream	964d069f	0655e081	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/06 14:32	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/06 11:54	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/06 03:17	upstream	1e0d27fc	23a562df	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/05 12:49	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/05 01:17	upstream	5c279c4c	23a562df	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/04 10:34	upstream	61556703	624dad51	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/03 20:41	upstream	3afe9076	624dad51	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/02 22:43	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/02 09:00	upstream	88bb507a	19e09687	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/02/01 19:53	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/01/17 10:18	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/01 14:11	upstream	7c30b859	39acb39d	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 15:47	upstream	1590a2e1	2defc703	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 14:32	upstream	1b504402	3ea11d3f	.config	log	report