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: 766d, last: 26d

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	779d	780d	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 0xffff888101b57968 of 8 bytes by task 8289 on cpu 1:
 blk_mq_dispatch_rq_list+0xaca/0x1070 block/blk-mq.c:1397
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:201 [inline]
 blk_mq_do_dispatch_sched+0x3b5/0x640 block/blk-mq-sched.c:214
 __blk_mq_sched_dispatch_requests+0x1eb/0x290
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1492
 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1569
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1622
 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513
 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1947
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1726
 blk_finish_plug+0x44/0x60 block/blk-core.c:1743
 read_pages+0x2e9/0x540 mm/readahead.c:150
 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:239
 ondemand_readahead+0x58c/0x7c0
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:580
 page_cache_sync_readahead include/linux/pagemap.h:883 [inline]
 filemap_get_pages mm/filemap.c:2545 [inline]
 filemap_read+0x3ad/0x1220 mm/filemap.c:2628
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2157 [inline]
 generic_file_splice_read+0x24f/0x330 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+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 0xffff888101b57968 of 8 bytes by task 8293 on cpu 0:
 blk_mq_dispatch_rq_list+0xab7/0x1070 block/blk-mq.c:1397
 __blk_mq_do_dispatch_sched block/blk-mq-sched.c:201 [inline]
 blk_mq_do_dispatch_sched+0x3b5/0x640 block/blk-mq-sched.c:214
 __blk_mq_sched_dispatch_requests+0x1eb/0x290
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __blk_mq_run_hw_queue+0xbc/0x140 block/blk-mq.c:1492
 __blk_mq_delay_run_hw_queue+0x163/0x2f0 block/blk-mq.c:1569
 blk_mq_run_hw_queue+0x22c/0x250 block/blk-mq.c:1622
 blk_mq_sched_insert_requests+0x12b/0x1f0 block/blk-mq-sched.c:513
 blk_mq_flush_plug_list+0x302/0x3d0 block/blk-mq.c:1947
 blk_flush_plug_list+0x235/0x260 block/blk-core.c:1726
 blk_finish_plug+0x44/0x60 block/blk-core.c:1743
 read_pages+0x2e9/0x540 mm/readahead.c:150
 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:239
 ondemand_readahead+0x58c/0x7c0
 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:580
 page_cache_sync_readahead include/linux/pagemap.h:883 [inline]
 filemap_get_pages mm/filemap.c:2545 [inline]
 filemap_read+0x3ad/0x1220 mm/filemap.c:2628
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2157 [inline]
 generic_file_splice_read+0x24f/0x330 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+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: 0x0000000000001745 -> 0x0000000000001746

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8293 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1741):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/11/01 01:21	upstream	8bb7eca972ad	098b5d53	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/31 11:39	upstream	180eca540ae0	098b5d53	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/30 21:50	upstream	119c85055d86	098b5d53	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/30 00:39	upstream	a379fbbcb88b	098b5d53	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/29 07:42	upstream	f25a5481af12	2353a3ec	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/28 18:38	upstream	411a44c24a56	be531bb4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/28 00:14	upstream	1fc596a56b33	be531bb4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/27 13:46	upstream	d25f27432f80	be531bb4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/27 12:34	upstream	d25f27432f80	373bf66b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/27 04:13	upstream	d25f27432f80	d50eb50a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/26 12:38	upstream	3906fe9bb7f1	d50eb50a	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/25 19:55	upstream	87066fdd2e30	c1132b49	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/25 18:03	upstream	87066fdd2e30	4f0000ee	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/24 23:09	upstream	6c62666d8879	4f0000ee	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/23 06:28	upstream	9c0c4d24ac00	282f03fb	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/22 15:23	upstream	64222515138e	282f03fb	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/22 14:11	upstream	64222515138e	55f90bc6	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/21 19:31	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/21 13:44	upstream	2f111a6fd5b5	c5cb7da8	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/20 22:43	upstream	2f111a6fd5b5	f111d03b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/20 10:41	upstream	d9abdee5fd5a	418a00eb	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/19 17:56	upstream	d9abdee5fd5a	466b7db1	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/18 16:38	upstream	519d81956ee2	24dc29db	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/18 06:01	upstream	cf52ad5ff16c	0c5d9412	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/17 05:56	upstream	d999ade1cc86	0c5d9412	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/16 20:10	upstream	304040fb4909	0c5d9412	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/15 15:18	upstream	8fe31e0995f0	0c5d9412	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/15 08:19	upstream	ec681c53f8d2	aab7690b	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/14 19:39	upstream	26d657410983	7aa5fe41	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/14 14:53	upstream	26d657410983	5462d470	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/13 21:04	upstream	348949d9a444	5462d470	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/13 09:10	upstream	f4d0cc426f77	9d56e7dd	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/12 23:08	upstream	f4d0cc426f77	08362356	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/12 14:25	upstream	fa5878760579	08362356	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/12 00:52	upstream	fa5878760579	838e7e2c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/11 08:43	upstream	64570fbc14f8	838e7e2c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/10 19:07	upstream	efb52a7d9511	838e7e2c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/10 01:29	upstream	7fd2bf83d59a	838e7e2c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/09 11:35	upstream	5d6ab0bb408f	838e7e2c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/08 20:23	upstream	741668ef7832	efe0f24d	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/08 10:48	upstream	1da38549dd64	efe0f24d	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/10/07 17:47	upstream	4a16df549d23	efe0f24d	.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	0da0a8a0a0e1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2019/10/23 02:54	https://github.com/google/ktsan.git kcsan	05f2236801fe	d0686497	.config	log	report