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: 652d, last: 2h20m

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	665d	665d	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 0xffff8881014fbd68 of 8 bytes by task 7593 on cpu 0:
 blk_mq_dispatch_rq_list+0xb4b/0x1040 block/blk-mq.c:1406
 __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 block/blk-mq-sched.c:329
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __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 0xffff8881014fbd68 of 8 bytes by task 7591 on cpu 1:
 blk_mq_dispatch_rq_list+0xb35/0x1040 block/blk-mq.c:1406
 __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 block/blk-mq-sched.c:329
 blk_mq_sched_dispatch_requests+0x9f/0x110 block/blk-mq-sched.c:360
 __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

value changed: 0x00000000000044a9 -> 0x00000000000044aa

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7591 Comm: syz-executor.4 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (1550):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/08/05 16:09	upstream	251a1524293d	d2d6e680	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/08/05 04:29	upstream	251a1524293d	7f7bb950	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/08/04 20:39	upstream	251a1524293d	b97d64c9	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/08/04 16:01	upstream	d5ad8ec3cfb5	b97d64c9	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/08/03 17:19	upstream	d5ad8ec3cfb5	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/08/02 09:40	upstream	c500bee1c5b2	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/08/01 20:26	upstream	d4affd6b6e81	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/31 21:28	upstream	f3438b4c4e69	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/31 08:14	upstream	c7d102232649	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/30 17:01	upstream	764a5bc89b12	6c236867	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/30 06:59	upstream	764a5bc89b12	c585c7b0	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/30 04:37	upstream	7e96bf476270	c585c7b0	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/29 18:00	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/29 16:21	upstream	4010a528219e	8a799410	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/29 04:14	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/28 18:17	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/28 16:12	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/27 22:39	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/27 15:45	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/26 06:05	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/26 03:46	upstream	ff1176468d36	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/25 13:39	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/24 23:53	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/24 09:40	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/24 03:54	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/23 13:37	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/23 00:03	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/22 12:14	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/22 09:50	upstream	3d5895cd3517	29c3f20f	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/21 20:24	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/21 13:07	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/20 13:10	upstream	8cae8cd89f05	1b201b48	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/20 11:54	upstream	2734d6c1b1a0	1b201b48	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/19 22:25	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/19 09:25	upstream	2734d6c1b1a0	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/18 19:17	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/18 00:56	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/17 11:33	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/16 22:54	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/16 09:25	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/15 20:01	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/15 15:39	upstream	8096acd7442e	f115ae98	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/15 00:12	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/14 17:20	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/14 12:50	upstream	40226a3d96ef	94e0b707	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/14 00:15	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/13 19:45	upstream	40226a3d96ef	70168d5c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/13 12:09	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in blk_mq_dispatch_rq_list / blk_mq_dispatch_rq_list
ci2-upstream-kcsan-gce	2021/07/12 20:01	upstream	7fef2edf7cc7	f415556d	.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