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: 623d, last: 1h27m

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests (2)				31	625d	660d	0/22	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	661d	661d	0/22	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 0xffff888102980958 of 8 bytes by task 30676 on cpu 0:
 blk_mq_sched_dispatch_requests+0x90/0x110 block/blk-mq-sched.c:354
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1500
 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1577
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1630
 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513
 blk_mq_flush_plug_list+0x2f2/0x3c0 block/blk-mq.c:1955
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1731
 blk_finish_plug+0x44/0x60 block/blk-core.c:1748
 read_pages+0x2d9/0x530 mm/readahead.c:150
 page_cache_ra_unbounded+0x3c8/0x410 mm/readahead.c:238
 ondemand_readahead+0x579/0x7b0 mm/readahead.c:267
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:578
 page_cache_sync_readahead include/linux/pagemap.h:884 [inline]
 filemap_get_pages mm/filemap.c:2467 [inline]
 filemap_read+0x388/0x1220 mm/filemap.c:2550
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701
 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73
 call_read_iter include/linux/fs.h:2108 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 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_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102980958 of 8 bytes by task 30686 on cpu 1:
 blk_mq_sched_dispatch_requests+0x7e/0x110 block/blk-mq-sched.c:354
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1500
 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1577
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1630
 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513
 blk_mq_flush_plug_list+0x2f2/0x3c0 block/blk-mq.c:1955
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1731
 blk_finish_plug+0x44/0x60 block/blk-core.c:1748
 __iomap_dio_rw+0x797/0xa60 fs/iomap/direct-io.c:583
 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:649
 ext4_dio_write_iter fs/ext4/file.c:568 [inline]
 ext4_file_write_iter+0xa04/0x11d0 fs/ext4/file.c:678
 call_write_iter include/linux/fs.h:2114 [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_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000000000aedd -> 0x000000000000aede

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30686 Comm: syz-executor.5 Tainted: G        W         5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1567):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 16:41	upstream	251a1524293d	d2d6e680	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/08/05 04:13	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/08/04 21:47	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/08/04 15:52	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/08/03 20:59	upstream	d5ad8ec3cfb5	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/08/02 10:51	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/08/01 20:34	upstream	d4affd6b6e81	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/31 22:30	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/31 08:21	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/30 19:18	upstream	4669e13cd67f	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/30 16:52	upstream	764a5bc89b12	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/30 05:34	upstream	764a5bc89b12	c585c7b0	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/30 04:26	upstream	7e96bf476270	c585c7b0	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/29 18:04	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/29 05:02	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/28 18:27	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/28 16:12	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/27 21:51	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/27 16:13	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/26 06:10	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/26 03:03	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/26 02:52	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/25 13:16	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/25 00:03	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/24 10:08	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/24 04:08	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/23 14:04	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/23 00:27	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/22 11:12	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/22 09:31	upstream	3d5895cd3517	29c3f20f	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/21 20:08	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/21 13:58	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/20 11:57	upstream	2734d6c1b1a0	1b201b48	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/20 00:41	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/19 10:15	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/19 08:26	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/18 19:28	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/18 00:53	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/17 11:33	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/16 22:25	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/16 09:04	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/15 19:48	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/15 16:25	upstream	8096acd7442e	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/15 01:12	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/07/14 17:18	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in blk_mq_sched_dispatch_requests / blk_mq_sched_dispatch_requests
ci2-upstream-kcsan-gce	2021/01/17 10:06	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/01/10 15:24	https://github.com/google/ktsan.git kcsan	245a43005292	532ec44e	.config	log	report
ci2-upstream-kcsan-gce	2020/01/06 20:57	https://github.com/google/ktsan.git kcsan	245a43005292	53430d97	.config	log	report
ci2-upstream-kcsan-gce	2019/11/20 22:33	https://github.com/google/ktsan.git kcsan	5863cc791e4c	8098ea0f	.config	log	report