KCSAN: data-race in do_mpage_readpage / set

KCSAN: data-race in do_mpage_readpage / set_blocksize (5)
Status: moderation: reported on 2021/05/21 10:18
Reported-by: syzbot+b835723c20b8d5f40485@syzkaller.appspotmail.com
First crash: 213d, last: 1h41m

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize (4)	4	280d	328d	0/22	auto-closed as invalid on 2020/11/26 12:05
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize (2)	17	466d	605d	0/22	auto-closed as invalid on 2020/06/18 13:33
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize	1	628d	628d	0/22	closed as invalid on 2019/11/19 14:44
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize (3)	2	364d	387d	0/22	auto-closed as invalid on 2020/09/03 22:48

Sample crash report:

==================================================================
BUG: KCSAN: data-race in do_mpage_readpage / set_blocksize

write to 0xffff8881014dfa56 of 1 bytes by task 3033 on cpu 0:
 set_blocksize+0x20a/0x270 fs/block_dev.c:165
 sb_set_blocksize fs/block_dev.c:175 [inline]
 sb_min_blocksize+0x9d/0x120 fs/block_dev.c:191
 ext4_fill_super+0x3a5/0x7ff0 fs/ext4/super.c:4068
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6638
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498
 do_new_mount fs/namespace.c:2905 [inline]
 path_mount+0x11d4/0x1ce0 fs/namespace.c:3235
 do_mount fs/namespace.c:3248 [inline]
 __do_sys_mount fs/namespace.c:3456 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3433
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3433
 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 0xffff8881014dfa56 of 1 bytes by task 3042 on cpu 1:
 do_mpage_readpage+0x6c/0x10b0 fs/mpage.c:160
 mpage_readahead+0x149/0x280 fs/mpage.c:389
 blkdev_readahead+0x18/0x20 fs/block_dev.c:649
 read_pages+0x9f/0x530 mm/readahead.c:130
 page_cache_ra_unbounded+0x3c8/0x410 mm/readahead.c:238
 do_page_cache_ra mm/readahead.c:267 [inline]
 force_page_cache_ra+0x246/0x280 mm/readahead.c:299
 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:573
 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
 blkdev_read_iter+0xb9/0xf0 fs/block_dev.c:1669
 call_read_iter include/linux/fs.h:2108 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x565/0x5d0 fs/read_write.c:496
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 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: 0x0c -> 0x0a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3042 Comm: systemd-udevd Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (181):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/07/30 09:32	upstream	764a5bc89b12	c585c7b0	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/29 19:32	upstream	7e96bf476270	8a799410	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/29 07:45	upstream	4010a528219e	b44001ce	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/28 20:14	upstream	4010a528219e	9a4781d4	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/28 16:40	upstream	7d549995d4e0	9a4781d4	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/28 06:35	upstream	7d549995d4e0	17d6ab15	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/27 17:53	upstream	ff1176468d36	17d6ab15	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/26 08:35	upstream	ff1176468d36	fd511809	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/25 14:29	upstream	d8079fac1681	4d1b57d4	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/25 04:50	upstream	7ffca2bb9d8b	4d1b57d4	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/24 14:32	upstream	f0fddcec6b62	4d1b57d4	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/24 08:05	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/23 23:21	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/23 01:35	upstream	9bead1b58c4c	bc5f1d88	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/22 13:26	upstream	3d5895cd3517	241790bb	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/21 23:13	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/21 15:39	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/20 17:55	upstream	8cae8cd89f05	1b201b48	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/20 01:32	upstream	2734d6c1b1a0	bc48c9ab	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/19 13:28	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/18 20:55	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/17 18:00	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/17 03:31	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/16 14:30	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/15 22:35	upstream	dd9c7df94c1b	f115ae98	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/15 05:56	upstream	8096acd7442e	b9a2f64e	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/14 19:35	upstream	8096acd7442e	94e0b707	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/14 05:10	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/13 23:21	upstream	40226a3d96ef	70168d5c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/13 14:13	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/13 09:55	upstream	7fef2edf7cc7	f415556d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/12 17:57	upstream	e73f0f0ee754	f415556d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/12 06:56	upstream	e73f0f0ee754	a4869c92	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/11 20:35	upstream	98f7fdced2e0	8f5a7b8c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/10 05:46	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/09 13:38	upstream	3dbdb38e2869	281e815f	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/08 22:26	upstream	3dbdb38e2869	1b20171a	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/08 09:33	upstream	3dbdb38e2869	1aade754	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/08 03:44	upstream	3dbdb38e2869	95793bce	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/07 11:44	upstream	3dbdb38e2869	4846d5c1	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/07 03:33	upstream	3dbdb38e2869	cca78469	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/07/06 08:52	upstream	3dbdb38e2869	6c4484eb	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/05/21 03:39	upstream	ba816d3c265c	3c7fef33	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/05/17 08:35	upstream	d07f6ca923ea	f54a5c09	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2020/12/29 03:52	upstream	dea8dcf2a9fa	8259d56c	.config	log	report	info