KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq

KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list (2)
Status: moderation: reported on 2019/12/05 17:55
Reported-by: syzbot+2c308b859c8c103aae53@syzkaller.appspotmail.com
First crash: 292d, last: 40m

similar bugs (1):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list			2	305d	306d	0/17	closed as invalid on 2019/10/18 14:11

Sample crash report:

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

write to 0xffff888129923560 of 8 bytes by task 10567 on cpu 0:
 blk_mq_dispatch_rq_list+0x8e9/0xd10 block/blk-mq.c:1413
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:192 [inline]
 blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:205
 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:316
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:347
 __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
 iomap_dio_rw+0x5ed/0x980 fs/iomap/direct-io.c:528
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x3be/0x420 fs/ext4/file.c:129
 call_read_iter include/linux/fs.h:1866 [inline]
 generic_file_splice_read+0x22b/0x310 fs/splice.c:312
 do_splice_to fs/splice.c:870 [inline]
 splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950
 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

read to 0xffff888129923560 of 8 bytes by task 10563 on cpu 1:
 blk_mq_dispatch_rq_list+0x8cc/0xd10 block/blk-mq.c:1413
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:192 [inline]
 blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:205
 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:316
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:347
 __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
 iomap_dio_rw+0x5ed/0x980 fs/iomap/direct-io.c:528
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0x3be/0x420 fs/ext4/file.c:129
 call_read_iter include/linux/fs.h:1866 [inline]
 generic_file_splice_read+0x22b/0x310 fs/splice.c:312
 do_splice_to fs/splice.c:870 [inline]
 splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950
 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: 1 PID: 10563 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 (533):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-upstream-kcsan-gce	2020/08/10 22:46	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 11:16	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 21:08	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 13:27	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 23:40	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 12:14	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 00:01	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 12:26	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 23:31	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 11:27	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 21:55	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 09:41	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 22:18	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 12:07	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 00:08	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 10:44	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 21:29	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 07:16	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 18:08	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 03:24	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 11:35	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 22:09	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 10:01	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 08:14	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 18:55	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 06:31	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 20:20	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 06:15	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 18:39	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 08:46	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 00:56	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 11:52	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 22:12	upstream	68845a55	554af388	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/24 10:53	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 21:43	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 16:55	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 03:33	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 19:36	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 15:16	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 01:59	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 14:02	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 01:53	upstream	4fa640dc	d88894e6	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/21 00:49	upstream	4fa640dc	8caeeeb7	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/10/23 02:54	https://github.com/google/ktsan.git kcsan	05f22368	d0686497	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org