KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_run_hw

KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_run_hw_queue
Status: auto-closed as invalid on 2020/12/04 12:11
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 389d, last: 267d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_run_hw_queue (2)				16	163d	228d	0/22	auto-closed as invalid on 2021/03/17 22:19

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_run_hw_queue

write to 0xffff8881025a5010 of 8 bytes by task 2979 on cpu 1:
 INIT_LIST_HEAD include/linux/list.h:36 [inline]
 list_splice_init include/linux/list.h:483 [inline]
 __blk_mq_sched_dispatch_requests+0x16a/0x2a0 block/blk-mq-sched.c:289
 blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1532
 __blk_mq_delay_run_hw_queue+0x17d/0x330 block/blk-mq.c:1609
 blk_mq_run_hw_queue+0x231/0x260 block/blk-mq.c:1662
 blk_mq_run_hw_queues block/blk-mq.c:1680 [inline]
 blk_mq_requeue_work+0x423/0x490 block/blk-mq.c:816
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
 worker_thread+0x635/0xb90 kernel/workqueue.c:2418
 kthread+0x1fa/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff8881025a5010 of 8 bytes by task 3190 on cpu 0:
 list_empty_careful include/linux/list.h:319 [inline]
 blk_mq_hctx_has_pending block/blk-mq.c:72 [inline]
 blk_mq_run_hw_queue+0x12e/0x260 block/blk-mq.c:1658
 blk_mq_submit_bio+0xd0d/0x1020 block/blk-mq.c:2205
 __submit_bio_noacct_mq block/blk-core.c:1026 [inline]
 submit_bio_noacct+0x77d/0x930 block/blk-core.c:1059
 submit_bio+0x1f3/0x360 block/blk-core.c:1129
 submit_bio_wait+0x79/0xc0 block/bio.c:1151
 blkdev_issue_flush+0xc3/0xe0 block/blk-flush.c:444
 ext4_sync_file+0x3e1/0x6a0 fs/ext4/fsync.c:177
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2723 [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:1887 [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+0x574/0xb70 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: 3190 Comm: syz-executor.2 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (24):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info
ci2-upstream-kcsan-gce	2020/10/30 12:07	upstream	07e088730245	a6e3ac3b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 04:23	upstream	d76913908102	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/24 20:09	upstream	f11901ed723d	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 20:35	upstream	96485e446260	4e740c00	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 15:10	upstream	f804b3159482	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 01:21	upstream	bbe85027ce80	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/17 07:24	upstream	54a4c789ca80	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 16:55	upstream	325d0eab4f31	9564d2e9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/30 07:05	upstream	1127b219ce94	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/29 01:58	upstream	96d454cd2c16	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/21 15:48	upstream	da2968ff879b	1d75fe45	.config	log	report
ci2-upstream-kcsan-gce	2020/08/12 08:40	upstream	bb5baaa9238e	bb3e5fe6	.config	log	report
ci2-upstream-kcsan-gce	2020/08/06 09:16	upstream	fffe3ae0ee84	0487ea6f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/02 23:45	upstream	142c3326b055	96dd3623	.config	log	report
ci2-upstream-kcsan-gce	2020/07/30 10:41	upstream	83bdc7275e62	b0947553	.config	log	report
ci2-upstream-kcsan-gce	2020/07/30 04:08	upstream	6ba1b005ffc3	233283a1	.config	log	report
ci2-upstream-kcsan-gce	2020/07/28 13:11	upstream	92ed30191993	cb93dc6a	.config	log	report
ci2-upstream-kcsan-gce	2020/07/26 20:12	upstream	1ada9010e578	51265195	.config	log	report
ci2-upstream-kcsan-gce	2020/07/17 14:43	upstream	8882572675c1	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/11 12:37	upstream	1df0d8960499	7ba05d2d	.config	log	report
ci2-upstream-kcsan-gce	2020/07/08 15:41	upstream	dcde237b9b0e	5962a2dc	.config	log	report
ci2-upstream-kcsan-gce	2020/07/02 19:27	upstream	cd77006e01b3	f30c14bf	.config	log	report
ci2-upstream-kcsan-gce	2020/06/30 16:37	upstream	7c30b859a947	917afeaa	.config	log	report
ci2-upstream-kcsan-gce	2020/06/30 10:03	upstream	7c30b859a947	917afeaa	.config	log	report