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: 264d, last: now

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	265d	300d	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	301d	301d	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

write to 0xffff8881298a4d50 of 8 bytes by task 3253 on cpu 1:
 blk_mq_sched_dispatch_requests+0x90/0x110 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1525
 blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1803
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff8881298a4d50 of 8 bytes by task 22782 on cpu 0:
 blk_mq_sched_dispatch_requests+0x7e/0x110 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1525
 __blk_mq_delay_run_hw_queue+0x199/0x340 block/blk-mq.c:1602
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1655
 blk_mq_sched_insert_requests+0x14d/0x200 block/blk-mq-sched.c:601
 blk_mq_flush_plug_list+0x2f5/0x420 block/blk-mq.c:1924
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1867
 blk_finish_plug+0x44/0x60 block/blk-core.c:1884
 ext4_writepages+0x18cd/0x1ef0 fs/ext4/inode.c:2833
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:422
 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:761
 ext4_sync_file+0xfc/0x6e0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2734 [inline]
 ext4_buffered_write_iter+0x369/0x3b0 fs/ext4/file.c:277
 ext4_file_write_iter+0x57b/0x1000 fs/ext4/file.c:498
 call_write_iter include/linux/fs.h:1872 [inline]
 do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:713
 do_iter_write+0x112/0x4b0 fs/read_write.c:1018
 vfs_iter_write+0x4c/0x70 fs/read_write.c:1059
 iter_file_splice_write+0x41a/0x770 fs/splice.c:750
 do_splice_from fs/splice.c:846 [inline]
 direct_splice_actor+0x95/0x160 fs/splice.c:1016
 splice_direct_to_actor+0x365/0x660 fs/splice.c:971
 do_splice_direct+0xf2/0x170 fs/splice.c:1059
 do_sendfile+0x56a/0xba0 fs/read_write.c:1540
 __do_sys_sendfile64 fs/read_write.c:1601 [inline]
 __se_sys_sendfile64 fs/read_write.c:1587 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587
 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: 22782 Comm: syz-executor.2 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (506):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-upstream-kcsan-gce	2020/08/10 22:57	upstream	fc80c51f	d3694ffb	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/10 10:41	upstream	fc80c51f	7adc7b65	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/09 21:56	upstream	9420f1ce	70301872	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/09 14:13	upstream	06a81c1c	70301872	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/09 13:44	upstream	06a81c1c	70301872	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/08 23:37	upstream	06a81c1c	f721e4a0	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/08 12:34	upstream	449dc8c9	01975a06	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/08 00:14	upstream	30185b69	ff51e522	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/07 12:01	upstream	86cfccb6	28ac5c9e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/06 23:35	upstream	d6efb3ac	cb436c69	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/06 11:31	upstream	47ec5303	4ca1c0ea	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/05 21:53	upstream	fffe3ae0	0487ea6f	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/05 09:46	upstream	c0842fbc	b7129355	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/04 21:36	upstream	c0842fbc	02034dac	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/04 10:57	upstream	c0842fbc	80a06902	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/04 00:20	upstream	e4cbce4d	96dd3623	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/03 10:43	upstream	bcf87687	96dd3623	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/02 21:16	upstream	142c3326	96dd3623	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/02 07:39	upstream	ac3a0c84	96dd3623	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/01 17:59	upstream	d52daa86	8df85ed9	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/01 03:14	upstream	7dc6fd0f	8df85ed9	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/31 11:29	upstream	d8b9faec	8df85ed9	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/30 22:17	upstream	e2c46b57	8df85ed9	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/30 09:58	upstream	83bdc727	b0947553	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/30 08:13	upstream	83bdc727	233283a1	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/29 19:15	upstream	6ba1b005	233283a1	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/29 06:35	upstream	6ba1b005	19a8de55	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/28 19:41	upstream	6ba1b005	cb93dc6a	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/27 06:17	upstream	92ed3019	cb93dc6a	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/26 18:43	upstream	1ada9010	51265195	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/26 08:41	upstream	04300d66	51265195	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/26 01:38	upstream	04300d66	1f7cc1ca	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/25 11:34	upstream	23ee3e4e	1f7cc1ca	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/24 22:42	upstream	68845a55	0a13649c	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/24 10:34	upstream	f37e99ac	554af388	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/23 21:29	upstream	f37e99ac	70c104a1	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/23 15:38	upstream	d15be546	70c104a1	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/23 02:17	upstream	d15be546	340ea530	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/22 19:06	upstream	8c26c87b	128cd85f	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/22 13:59	upstream	4fa640dc	128cd85f	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/22 01:55	upstream	4fa640dc	21f1765e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/21 13:57	upstream	4fa640dc	e562dd8a	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/21 01:01	upstream	4fa640dc	8caeeeb7	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/20 09:33	upstream	5714ee50	8caeeeb7	.config	log	report	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