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: 334d, last: 8h29m

similar bugs (2):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests (2)			31	336d	371d	0/17	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	372d	372d	0/17	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-write to 0xffff888102bcc950 of 8 bytes by task 3250 on cpu 1:
 blk_mq_sched_dispatch_requests+0x80/0xf0 block/blk-mq-sched.c:335
 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1532
 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1810
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 kthread+0x1ff/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read-write to 0xffff888102bcc950 of 8 bytes by task 22802 on cpu 0:
 blk_mq_sched_dispatch_requests+0x80/0xf0 block/blk-mq-sched.c:335
 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1532
 __blk_mq_delay_run_hw_queue+0x18e/0x340 block/blk-mq.c:1609
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1662
 blk_mq_sched_insert_requests+0x144/0x210 block/blk-mq-sched.c:501
 blk_mq_flush_plug_list+0x2f5/0x400 block/blk-mq.c:1932
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1756
 blk_finish_plug+0x44/0x60 block/blk-core.c:1773
 read_pages+0x3a6/0x6e0 mm/readahead.c:150
 page_cache_ra_unbounded+0x464/0x4c0 mm/readahead.c:238
 ondemand_readahead+0x560/0x780 mm/readahead.c:267
 page_cache_sync_ra+0x145/0x170 mm/readahead.c:569
 page_cache_sync_readahead include/linux/pagemap.h:839 [inline]
 generic_file_buffered_read+0x315/0x20b0 mm/filemap.c:2219
 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2527
 ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1881 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:889 [inline]
 splice_direct_to_actor+0x2ab/0x660 fs/splice.c:969
 do_splice_direct+0xf5/0x170 fs/splice.c:1078
 do_sendfile+0x574/0xb70 fs/read_write.c:1238
 __do_sys_sendfile64 fs/read_write.c:1299 [inline]
 __se_sys_sendfile64 fs/read_write.c:1285 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1285
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22802 Comm: syz-executor.0 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (810):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2020/10/20 12:40	upstream	270315b8	ff4a3345	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/19 22:28	upstream	bbe85027	ff4a3345	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/19 08:41	upstream	7cf726a5	ff4a3345	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/19 07:06	upstream	7cf726a5	fea47c01	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/18 17:50	upstream	9453b2d4	fea47c01	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/18 02:04	upstream	9d9af100	fea47c01	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/17 12:25	upstream	071a0578	fea47c01	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/16 22:51	upstream	54a4c789	6e262c73	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/16 10:06	upstream	9ff9b0d3	6e262c73	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/15 20:39	upstream	726eb70e	6e262c73	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/15 18:15	upstream	726eb70e	63869021	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/15 08:09	upstream	3e4fb434	63869021	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/15 00:23	upstream	3e4fb434	fc7735a2	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/14 10:35	upstream	b5fc7a89	fc7735a2	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/13 21:24	upstream	6ad4bf6e	fc7735a2	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/13 08:28	upstream	865c50e1	bd69ee0d	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/12 19:22	upstream	1e6d1d96	d32b0bbf	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/12 15:38	upstream	bbf5c979	d32b0bbf	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/12 08:13	upstream	bbf5c979	4a77ae0b	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/11 18:52	upstream	3dd0130f	4a77ae0b	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/11 00:09	upstream	da690031	4a77ae0b	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/10 21:53	upstream	6f2f486d	4a77ae0b	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/10 10:04	upstream	6f2f486d	b74c49a6	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/09 21:41	upstream	8a5f78d9	93817d89	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/09 09:54	upstream	583090b1	fa79ed2a	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/09 09:51	upstream	583090b1	fa79ed2a	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/08 20:47	upstream	3d006ee4	92390980	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/08 10:48	upstream	c85fb28b	92390980	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/06 20:01	upstream	c85fb28b	1880b4a9	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/05 20:58	upstream	7575fdda	1880b4a9	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/05 13:48	upstream	549738f1	1880b4a9	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/05 00:13	upstream	549738f1	5ef9c291	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/04 09:19	upstream	22fbc037	5ef9c291	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/03 20:38	upstream	22fbc037	1a3f9408	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/03 16:48	upstream	d3d45f82	1a3f9408	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/03 03:37	upstream	d3d45f82	2653fa43	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/02 12:30	upstream	472e5b05	9602ddf4	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/01 20:38	upstream	fcadab74	9602ddf4	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/01 08:24	upstream	60e72093	4103fce0	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/30 22:00	upstream	60e72093	a9767fb2	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/30 18:35	upstream	02de58b2	a9767fb2	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/30 06:37	upstream	02de58b2	8516f6d3	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/30 05:23	upstream	02de58b2	5abc3f1a	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/29 14:30	upstream	fb0155a0	5abc3f1a	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/28 23:19	upstream	fb0155a0	1b88c6d5	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/28 08:09	upstream	a1b8638b	6bfdbe89	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/28 02:03	upstream	a1b8638b	5dd8aee8	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/27 13:11	upstream	a1bffa48	5dd8aee8	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/10 15:24	https://github.com/google/ktsan.git kcsan	245a4300	532ec44e	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/06 20:57	https://github.com/google/ktsan.git kcsan	245a4300	53430d97	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/20 22:33	https://github.com/google/ktsan.git kcsan	5863cc79	8098ea0f	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org