KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass

KCSAN: data-race in blk_mq_do_dispatch_sched / blk_mq_request_bypass_insert
Status: moderation: reported on 2020/12/07 11:25
Reported-by: syzbot+cbd503fe55400f0ef6f1@syzkaller.appspotmail.com
First crash: 213d, last: 4d09h

Sample crash report:

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

write to 0xffff888101413410 of 8 bytes by task 3196 on cpu 1:
 __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:1840
 blk_mq_sched_insert_request+0x12c/0x280 block/blk-mq-sched.c:450
 blk_mq_requeue_work+0x37b/0x490 block/blk-mq.c:821
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x635/0xb90 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff888101413410 of 8 bytes by task 17946 on cpu 0:
 list_empty_careful include/linux/list.h:319 [inline]
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:138 [inline]
 blk_mq_do_dispatch_sched+0x17c/0x610 block/blk-mq-sched.c:199
 __blk_mq_sched_dispatch_requests+0x1fd/0x2a0 block/blk-mq-sched.c:310
 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue block/blk-mq.c:1515 [inline]
 __blk_mq_delay_run_hw_queue+0x1ff/0x410 block/blk-mq.c:1592
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1645
 blk_mq_sched_insert_requests+0x144/0x210 block/blk-mq-sched.c:501
 blk_mq_flush_plug_list+0x2f5/0x400 block/blk-mq.c:1915
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1755
 blk_finish_plug+0x44/0x60 block/blk-core.c:1772
 ext4_writepages+0x18bd/0x1e50 fs/ext4/inode.c:2852
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422
 file_write_and_wait_range+0x9f/0x120 mm/filemap.c:761
 ext4_sync_file+0x105/0x6e0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2737 [inline]
 ext4_buffered_write_iter+0x384/0x3d0 fs/ext4/file.c:278
 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4b0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x42a/0x780 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:933
 splice_direct_to_actor+0x345/0x650 fs/splice.c:888
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5db/0xca0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1312 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304
 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: 17946 Comm: syz-executor.2 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (53):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/20 22:35	upstream	75439bc4	d4f4eca5	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/20 11:26	upstream	45dfb8a5	d4f4eca5	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/17 11:10	upstream	0da0a8a0	813be542	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/16 09:33	upstream	1d94330a	65a7a854	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/15 07:39	upstream	14662050	65a7a854	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/11 23:44	upstream	a0d54b4f	2c1f2513	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/10 00:08	upstream	2ff90100	2c1f2513	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/06 11:05	upstream	9f1abbe9	fff20c29	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/30 22:37	upstream	f6e1ea19	ecb8c012	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/29 14:13	upstream	dea8dcf2	80910769	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/24 01:44	upstream	58cf05f5	c2c1d1dd	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/23 12:23	upstream	614cb589	c2c1d1dd	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/21 22:16	upstream	8653b778	04201c06	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/19 04:39	upstream	3644e2d2	04201c06	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/15 19:03	upstream	148842c9	f213e07e	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/14 08:22	upstream	2c85ebc5	b22a7ec3	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/13 19:39	upstream	6bff9bb8	8f160dd5	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/11 00:31	upstream	9fca90cf	f900b48c	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/06 20:03	upstream	8100a580	c521566d	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/03 18:01	upstream	34816d20	59ad4022	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/29 15:21	upstream	aae5ab85	a0092f9d	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/27 23:02	upstream	85a2c56c	486f93ef	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/26 08:40	upstream	fa02fcd9	2f1cec62	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/25 17:30	upstream	127c501a	3f581b43	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/24 21:19	upstream	80145ac2	e34b696c	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/13 15:49	upstream	585e5b17	4a7fa9b4	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/12 16:49	upstream	3d5e28bf	77a55c8e	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/06 03:28	upstream	521b619a	cba33199	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/29 19:01	upstream	23859ae4	a0c7169a	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/29 11:01	upstream	23859ae4	f24824d3	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/26 10:36	upstream	3650b228	a7aac492	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/22 00:36	upstream	f804b315	be6b1582	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/26 02:50	upstream	7c7ec322	4a006f63	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/24 01:14	upstream	c9c9e6a4	54289b08	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/23 06:23	upstream	805c6d3c	3e8f6c27	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/22 15:31	upstream	98477740	3e8f6c27	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/21 20:58	upstream	98477740	9e1fa68e	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/20 01:30	upstream	eb5f95f1	53ce8104	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/19 12:40	upstream	eb5f95f1	53ce8104	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/16 15:08	upstream	fc4f28bb	77507d02	.config	log	report	info	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/11 12:25	upstream	581cb3a2	adfb8b4e	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/10 13:14	upstream	7fe10096	ac7ca78e	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/01 07:56	upstream	b51594df	d5a3ae1f	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/13 10:42	upstream	fb893de3	bc15f7db	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/10 19:41	upstream	fc80c51f	7adc7b65	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/08 21:14	upstream	449dc8c9	01975a06	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/29 20:06	upstream	6ba1b005	233283a1	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/25 22:17	upstream	23ee3e4e	1f7cc1ca	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/14 12:29	upstream	0dc589da	6f458026	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/07/01 05:33	upstream	7c30b859	c0383ebe	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/06/29 03:17	upstream	9ebcfadb	a2cdad9d	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/06/25 19:17	upstream	908f7d12	adb7d9e6	.config	log	report		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org