KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx

KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
Status: moderation: reported on 2020/07/01 15:52
Reported-by: syzbot+49a9bcf457723ecaf1cf@syzkaller.appspotmail.com
First crash: 458d, last: 1h06m

Sample crash report:

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

write to 0xffff888102648550 of 8 bytes by task 6169 on cpu 1:
 blk_mq_rq_ctx_init+0x3dc/0x4e0 block/blk-mq.c:344
 __blk_mq_alloc_request+0x270/0x290 block/blk-mq.c:399
 blk_mq_submit_bio+0x27f/0xec0 block/blk-mq.c:2199
 __submit_bio_noacct_mq block/blk-core.c:998 [inline]
 submit_bio_noacct+0x6e2/0x7d0 block/blk-core.c:1031
 submit_bio+0x10c/0x190
 submit_bh_wbc+0x2f3/0x330 fs/buffer.c:3050
 submit_bh fs/buffer.c:3056 [inline]
 __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3151
 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3164
 __ext4_handle_dirty_metadata+0x1c9/0x5a0 fs/ext4/ext4_jbd2.c:380
 ext4_splice_branch fs/ext4/indirect.c:465 [inline]
 ext4_ind_map_blocks+0x12b6/0x16d0 fs/ext4/indirect.c:639
 ext4_map_blocks+0x6e3/0xf00 fs/ext4/inode.c:639
 ext4_iomap_alloc fs/ext4/inode.c:3432 [inline]
 ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3482
 iomap_iter+0x39c/0x470 fs/iomap/iter.c:74
 __iomap_dio_rw+0xbe3/0x1010 fs/iomap/direct-io.c:568
 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+0xaa9/0x11f0 fs/ext4/file.c:678
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x43a/0x790 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+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102648550 of 8 bytes by task 6180 on cpu 0:
 blk_mq_rq_ctx_init+0x3ca/0x4e0 block/blk-mq.c:344
 __blk_mq_alloc_request+0x270/0x290 block/blk-mq.c:399
 blk_mq_submit_bio+0x27f/0xec0 block/blk-mq.c:2199
 __submit_bio_noacct_mq block/blk-core.c:998 [inline]
 submit_bio_noacct+0x6e2/0x7d0 block/blk-core.c:1031
 submit_bio+0x10c/0x190
 submit_bh_wbc+0x2f3/0x330 fs/buffer.c:3050
 submit_bh fs/buffer.c:3056 [inline]
 __sync_dirty_buffer+0x136/0x1e0 fs/buffer.c:3151
 sync_dirty_buffer+0x16/0x20 fs/buffer.c:3164
 __ext4_handle_dirty_metadata+0x1c9/0x5a0 fs/ext4/ext4_jbd2.c:380
 ext4_splice_branch fs/ext4/indirect.c:465 [inline]
 ext4_ind_map_blocks+0x12b6/0x16d0 fs/ext4/indirect.c:639
 ext4_map_blocks+0x6e3/0xf00 fs/ext4/inode.c:639
 ext4_iomap_alloc fs/ext4/inode.c:3432 [inline]
 ext4_iomap_begin+0x4b0/0x630 fs/ext4/inode.c:3482
 iomap_iter+0x39c/0x470 fs/iomap/iter.c:74
 __iomap_dio_rw+0xbe3/0x1010 fs/iomap/direct-io.c:568
 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+0xaa9/0x11f0 fs/ext4/file.c:678
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x43a/0x790 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+0x106/0x190 fs/splice.c:979
 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000000017e9 -> 0x00000000000017ea

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6180 Comm: syz-executor.0 Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
syz-executor.0 (6180) used greatest stack depth: 9520 bytes left

Crashes (1379):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/09/20 08:06	upstream	e4e737bb5c17	3d9c9a2a	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/19 23:33	upstream	20621d2f27a0	70b76c1d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/19 10:10	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/18 21:06	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/18 06:02	upstream	4357f03d6611	70b76c1d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/17 16:43	upstream	ddf21bd8ab98	70b76c1d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/17 13:58	upstream	bdb575f87217	70b76c1d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/17 02:07	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/16 13:57	upstream	ff1ffd71d5f0	aae492f2	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/16 08:12	upstream	ff1ffd71d5f0	07e953c1	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/15 19:28	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/15 05:49	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/14 15:23	upstream	d0ee23f9d78b	07e953c1	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/14 08:36	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/13 19:01	upstream	316346243be6	58d09404	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/13 17:37	upstream	6880fa6c5660	58d09404	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/13 02:22	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/12 13:34	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/11 23:46	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/11 10:51	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/10 22:31	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/10 21:11	upstream	e99f23c5bf59	5ae8508a	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/10 10:58	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/10 01:19	upstream	bf9f243f23e6	e2776ee4	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/09 12:52	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/08 23:07	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/08 09:53	upstream	ac08b1c68d1b	e2776ee4	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/07 21:34	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/07 19:06	upstream	0bcfe68b8767	6ca60148	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/06 23:16	upstream	4b93c544e90e	6ca60148	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/06 10:03	upstream	27151f177827	6ca60148	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/03 10:21	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/02 22:07	upstream	4ac6d90867a4	f62a5829	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/02 10:29	upstream	4ac6d90867a4	d0f0970b	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/02 09:06	upstream	4ac6d90867a4	7eb7e152	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/09/01 18:24	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/31 14:50	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/31 12:39	upstream	b91db6a0b52e	8f58a0ef	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/30 23:01	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/30 10:18	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/29 21:36	upstream	537b57bd5a20	be2c130d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/28 19:43	upstream	3f5ad13cb012	be2c130d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/28 17:13	upstream	64b4fc45bea6	be2c130d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/28 05:07	upstream	64b4fc45bea6	d5a29e53	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/27 18:32	upstream	1a6436f37512	57b01c6e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/27 18:26	upstream	1a6436f37512	57b01c6e	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/27 10:11	upstream	77dd11439b86	b318694d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/08/26 20:44	upstream	1a6d80ff2419	b318694d	.config	log	report	info	KCSAN: data-race in blk_mq_rq_ctx_init / blk_mq_rq_ctx_init
ci2-upstream-kcsan-gce	2021/01/17 10:18	upstream	0da0a8a0a0e1	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/01 14:11	upstream	7c30b859a947	39acb39d	.config	log	report
ci2-upstream-kcsan-gce	2020/06/27 15:47	upstream	1590a2e1c681	2defc703	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 14:32	upstream	1b5044021070	3ea11d3f	.config	log	report