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: 548d, last: 11h58m

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list				2	560d	561d	0/22	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 0xffff888100ede560 of 8 bytes by task 13556 on cpu 0:
 blk_mq_dispatch_rq_list+0xa4a/0xfa0 block/blk-mq.c:1395
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:186 [inline]
 blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:199
 __blk_mq_sched_dispatch_requests+0x21e/0x2c0 block/blk-mq-sched.c:310
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1488
 __blk_mq_delay_run_hw_queue+0x163/0x2d0 block/blk-mq.c:1565
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1618
 blk_mq_sched_insert_requests+0x13f/0x200 block/blk-mq-sched.c:491
 blk_mq_flush_plug_list+0x2f5/0x3c0 block/blk-mq.c:1942
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1749
 blk_finish_plug+0x44/0x60 block/blk-core.c:1766
 mpage_writepages+0xfa/0x120 fs/mpage.c:719
 fat_writepages+0x20/0x30 fs/fat/inode.c:205
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __filemap_fdatawrite_range mm/filemap.c:424 [inline]
 filemap_write_and_wait_range+0x20a/0x390 mm/filemap.c:657
 __generic_file_write_iter+0x231/0x300 mm/filemap.c:3690
 generic_file_write_iter+0x75/0x130 mm/filemap.c:3736
 call_write_iter include/linux/fs.h:1977 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888100ede560 of 8 bytes by task 13568 on cpu 1:
 blk_mq_dispatch_rq_list+0xa37/0xfa0 block/blk-mq.c:1395
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:186 [inline]
 blk_mq_do_dispatch_sched+0x370/0x610 block/blk-mq-sched.c:199
 __blk_mq_sched_dispatch_requests+0x21e/0x2c0 block/blk-mq-sched.c:310
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:341
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1488
 __blk_mq_delay_run_hw_queue+0x163/0x2d0 block/blk-mq.c:1565
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1618
 blk_mq_sched_insert_requests+0x13f/0x200 block/blk-mq-sched.c:491
 blk_mq_flush_plug_list+0x2f5/0x3c0 block/blk-mq.c:1942
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1749
 blk_finish_plug+0x44/0x60 block/blk-core.c:1766
 read_pages+0x2d9/0x530 mm/readahead.c:150
 page_cache_ra_unbounded+0x17d/0x400 mm/readahead.c:212
 do_page_cache_ra mm/readahead.c:267 [inline]
 force_page_cache_ra+0x236/0x270 mm/readahead.c:298
 page_cache_sync_ra+0xb5/0xd0 mm/readahead.c:572
 page_cache_sync_readahead include/linux/pagemap.h:840 [inline]
 filemap_get_pages mm/filemap.c:2375 [inline]
 filemap_read+0x380/0x1210 mm/filemap.c:2458
 generic_file_read_iter+0x84/0x3e0 mm/filemap.c:2609
 blkdev_read_iter+0xb3/0xc0 fs/block_dev.c:1727
 call_read_iter include/linux/fs.h:1971 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x565/0x5d0 fs/read_write.c:496
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13568 Comm: systemd-udevd Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1317):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/22 22:45	upstream	90c911ad	33c28d03	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/22 11:55	upstream	16fc44d6	33c28d03	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/21 20:20	upstream	16fc44d6	2bc8999a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/21 18:05	upstream	16fc44d6	95777977	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/21 08:03	upstream	1fe5501b	95777977	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/21 00:11	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/20 07:30	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/19 22:48	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/19 19:25	upstream	bf05bf16	4285c989	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/19 07:18	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/18 22:57	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/18 09:29	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/17 20:08	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/17 07:06	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/16 17:57	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/16 12:30	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/16 05:44	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/15 16:30	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/14 22:34	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/14 10:13	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/13 21:51	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/13 18:51	upstream	89698bec	a184b83e	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/12 22:57	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/12 09:35	upstream	d434405a	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/11 19:27	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/11 04:19	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/10 14:30	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/10 01:08	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/09 11:35	upstream	17e7124a	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/08 22:06	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/08 08:48	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/08 08:36	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/07 20:14	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/06 20:48	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/05 18:35	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/04 22:23	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/04 02:57	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/03 13:17	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/02 23:24	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/02 07:17	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/04/01 18:12	upstream	ffd9fb54	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/03/31 19:08	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/03/31 05:54	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/03/30 16:32	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/03/29 20:29	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/01/17 09:55	upstream	0da0a8a0	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 02:54	https://github.com/google/ktsan.git kcsan	05f22368	d0686497	.config	log	report