KCSAN: data-race in wbt_wait / wbt

KCSAN: data-race in wbt_wait / wbt_wait
Status: moderation: reported on 2019/10/29 20:02
Reported-by: syzbot+ba8947364367f96fe16b@syzkaller.appspotmail.com
First crash: 121d, last: 8d03h

Sample crash report:

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

write to 0xffff88812a683f40 of 8 bytes by task 12357 on cpu 0:
 wb_timestamp block/blk-wbt.c:89 [inline]
 wb_timestamp block/blk-wbt.c:83 [inline]
 wbt_wait+0x230/0x260 block/blk-wbt.c:587
 __rq_qos_throttle+0x47/0x70 block/blk-rq-qos.c:72
 rq_qos_throttle block/blk-rq-qos.h:182 [inline]
 blk_mq_make_request+0x29c/0xf60 block/blk-mq.c:1932
 generic_make_request block/blk-core.c:1066 [inline]
 generic_make_request+0x196/0x700 block/blk-core.c:1008
 submit_bio+0x96/0x3c0 block/blk-core.c:1192
 ext4_mpage_readpages+0xff1/0x1580 fs/ext4/readpage.c:410
 ext4_readpages+0x92/0xc0 fs/ext4/inode.c:3244
 read_pages+0xa2/0x2d0 mm/readahead.c:126
 __do_page_cache_readahead+0x353/0x390 mm/readahead.c:212
 ra_submit mm/internal.h:62 [inline]
 ondemand_readahead+0x35d/0x710 mm/readahead.c:492
 page_cache_sync_readahead+0x1ad/0x1e0 mm/readahead.c:527
 generic_file_buffered_read mm/filemap.c:2051 [inline]
 generic_file_read_iter+0xeb6/0x1440 mm/filemap.c:2324
 ext4_file_read_iter fs/ext4/file.c:130 [inline]
 ext4_file_read_iter+0x10c/0x380 fs/ext4/file.c:113
 call_read_iter include/linux/fs.h:1896 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:313
 do_splice_to+0xf2/0x130 fs/splice.c:892
 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812a683f40 of 8 bytes by task 12360 on cpu 1:
 wb_timestamp block/blk-wbt.c:88 [inline]
 wb_timestamp block/blk-wbt.c:83 [inline]
 wbt_wait+0x20b/0x260 block/blk-wbt.c:587
 __rq_qos_throttle+0x47/0x70 block/blk-rq-qos.c:72
 rq_qos_throttle block/blk-rq-qos.h:182 [inline]
 blk_mq_make_request+0x29c/0xf60 block/blk-mq.c:1932
 generic_make_request block/blk-core.c:1066 [inline]
 generic_make_request+0x196/0x700 block/blk-core.c:1008
 submit_bio+0x96/0x3c0 block/blk-core.c:1192
 iomap_dio_submit_bio.isra.0+0xfc/0x120 fs/iomap/direct-io.c:70
 iomap_dio_bio_actor+0x40a/0x960 fs/iomap/direct-io.c:306
 iomap_dio_actor+0x87/0x3a0 fs/iomap/direct-io.c:382
 iomap_apply+0x20d/0x6a0 fs/iomap/apply.c:80
 iomap_dio_rw+0x67e/0x9a0 fs/iomap/direct-io.c:498
 ext4_dio_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter fs/ext4/file.c:128 [inline]
 ext4_file_read_iter+0x2e4/0x380 fs/ext4/file.c:113
 call_read_iter include/linux/fs.h:1896 [inline]
 generic_file_splice_read+0x35c/0x500 fs/splice.c:313
 do_splice_to+0xf2/0x130 fs/splice.c:892
 splice_direct_to_actor+0x1b6/0x540 fs/splice.c:971
 do_splice_direct+0x161/0x1e0 fs/splice.c:1080
 do_sendfile+0x384/0x7f0 fs/read_write.c:1464
 __do_sys_sendfile64 fs/read_write.c:1525 [inline]
 __se_sys_sendfile64 fs/read_write.c:1511 [inline]
 __x64_sys_sendfile64+0x12a/0x140 fs/read_write.c:1511
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12360 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (41):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-upstream-kcsan-gce	2020/02/13 20:32	https://github.com/google/ktsan.git kcsan	55121bc1	e6247653	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/02/09 21:59	https://github.com/google/ktsan.git kcsan	f60f0f54	35f5e45e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/02/07 00:14	https://github.com/google/ktsan.git kcsan	245a4300	06150bf1	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/02/06 00:34	https://github.com/google/ktsan.git kcsan	245a4300	662cf49a	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/02/05 00:15	https://github.com/google/ktsan.git kcsan	245a4300	93e5e335	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/02/01 14:40	https://github.com/google/ktsan.git kcsan	245a4300	326d4c78	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/29 12:36	https://github.com/google/ktsan.git kcsan	245a4300	c8e81ce4	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/29 12:35	https://github.com/google/ktsan.git kcsan	245a4300	c8e81ce4	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/28 01:52	https://github.com/google/ktsan.git kcsan	245a4300	56cd6c9b	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/26 08:07	https://github.com/google/ktsan.git kcsan	245a4300	f4e7270e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/26 08:02	https://github.com/google/ktsan.git kcsan	245a4300	f4e7270e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/23 22:26	https://github.com/google/ktsan.git kcsan	245a4300	11ebf937	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/22 23:14	https://github.com/google/ktsan.git kcsan	245a4300	3334d684	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/21 01:11	https://github.com/google/ktsan.git kcsan	245a4300	8eda0b95	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/20 02:43	https://github.com/google/ktsan.git kcsan	245a4300	0342f8c7	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/17 07:39	https://github.com/google/ktsan.git kcsan	245a4300	3de7aabb	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/15 11:19	https://github.com/google/ktsan.git kcsan	245a4300	fa12bd3c	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/14 09:52	https://github.com/google/ktsan.git kcsan	245a4300	32881205	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/11 22:01	https://github.com/google/ktsan.git kcsan	245a4300	4c04afaa	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/10 18:43	https://github.com/google/ktsan.git kcsan	245a4300	532ec44e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/01/10 12:33	https://github.com/google/ktsan.git kcsan	245a4300	4de4e9f0	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/29 04:38	https://github.com/google/ktsan.git kcsan	245a4300	af6b8ef8	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/24 13:01	https://github.com/google/ktsan.git kcsan	245a4300	be5c2c81	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/22 19:12	https://github.com/google/ktsan.git kcsan	245a4300	8b967267	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/17 01:38	https://github.com/google/ktsan.git kcsan	245a4300	d13d7958	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/16 12:14	https://github.com/google/ktsan.git kcsan	245a4300	0ae38e44	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/14 07:39	https://github.com/google/ktsan.git kcsan	245a4300	eef6e580	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/11 03:27	https://github.com/google/ktsan.git kcsan	ef798c30	101194eb	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/12/08 13:08	https://github.com/google/ktsan.git kcsan	ef798c30	1508f453	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/29 11:33	https://github.com/google/ktsan.git kcsan	ef798c30	4f7e1d0f	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/27 00:15	https://github.com/google/ktsan.git kcsan	ef798c30	1048481f	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/22 12:41	https://github.com/google/ktsan.git kcsan	5863cc79	598ca6c8	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/22 02:52	https://github.com/google/ktsan.git kcsan	5863cc79	8098ea0f	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/19 16:12	https://github.com/google/ktsan.git kcsan	5863cc79	432c7650	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/14 04:42	https://github.com/google/ktsan.git kcsan	7f2955e0	048f2d49	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/11/09 03:40	https://github.com/google/ktsan.git kcsan	94c00660	1e35461e	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/10/31 10:33	https://github.com/google/ktsan.git kcsan	05f22368	a41ca8fa	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/10/28 16:28	https://github.com/google/ktsan.git kcsan	05f22368	439d7b14	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/10/24 16:55	https://github.com/google/ktsan.git kcsan	05f22368	d01bb02a	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/10/23 19:32	https://github.com/google/ktsan.git kcsan	05f22368	b602d64b	.config	log	report	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2019/10/23 04:53	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