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: 293d, last: 4h36m

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize (4)	4	361d	408d	0/22	auto-closed as invalid on 2020/11/26 12:05
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize (2)	17	546d	686d	0/22	auto-closed as invalid on 2020/06/18 13:33
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize	1	708d	708d	0/22	closed as invalid on 2019/11/19 14:44
upstream	KCSAN: data-race in do_mpage_readpage / set_blocksize (3)	2	445d	468d	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 0xffff88810042d4ce of 1 bytes by task 7814 on cpu 0:
 set_blocksize+0x20a/0x270 block/bdev.c:156
 sb_set_blocksize block/bdev.c:166 [inline]
 sb_min_blocksize+0x9d/0x120 block/bdev.c:182
 ext4_fill_super+0x3a5/0x7830 fs/ext4/super.c:3924
 mount_bdev+0x1e8/0x290 fs/super.c:1368
 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515
 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:2988 [inline]
 path_mount+0x11ec/0x1d20 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516
 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 0xffff88810042d4ce of 1 bytes by task 32642 on cpu 1:
 do_mpage_readpage+0x6c/0x10b0 fs/mpage.c:160
 mpage_readahead+0x149/0x280 fs/mpage.c:389
 blkdev_readahead+0x18/0x20 block/fops.c:347
 read_pages+0xb6/0x540 mm/readahead.c:130
 page_cache_ra_unbounded+0x3d2/0x430 mm/readahead.c:239
 do_page_cache_ra mm/readahead.c:269 [inline]
 force_page_cache_ra+0x256/0x290 mm/readahead.c:301
 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:575
 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
 blkdev_read_iter+0xb9/0xf0 block/fops.c:545
 call_read_iter include/linux/fs.h:2157 [inline]
 new_sync_read fs/read_write.c:404 [inline]
 vfs_read+0x66c/0x750 fs/read_write.c:485
 ksys_read+0xd9/0x190 fs/read_write.c:623
 __do_sys_read fs/read_write.c:633 [inline]
 __se_sys_read fs/read_write.c:631 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:631
 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: 0x0c -> 0x0a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 32642 Comm: udevd Not tainted 5.15.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (328):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/10/18 19:23	upstream	519d81956ee2	24dc29db	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/18 05:11	upstream	cf52ad5ff16c	0c5d9412	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/17 08:50	upstream	d999ade1cc86	0c5d9412	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/16 18:08	upstream	304040fb4909	0c5d9412	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/15 21:50	upstream	8fe31e0995f0	0c5d9412	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/15 09:59	upstream	ec681c53f8d2	aab7690b	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/14 21:20	upstream	26d657410983	7aa5fe41	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/14 18:00	upstream	26d657410983	5462d470	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/13 21:54	upstream	348949d9a444	5462d470	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/13 08:17	upstream	f4d0cc426f77	9d56e7dd	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/13 02:40	upstream	f4d0cc426f77	08362356	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/12 15:21	upstream	fa5878760579	08362356	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/12 01:20	upstream	fa5878760579	838e7e2c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/11 08:51	upstream	64570fbc14f8	838e7e2c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/10 19:29	upstream	efb52a7d9511	838e7e2c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/10 08:52	upstream	7fd2bf83d59a	838e7e2c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/09 13:14	upstream	5d6ab0bb408f	838e7e2c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/08 20:27	upstream	741668ef7832	efe0f24d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/08 13:34	upstream	1da38549dd64	efe0f24d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/07 19:33	upstream	4a16df549d23	efe0f24d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/07 16:26	upstream	5af4055fa813	efe0f24d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/07 09:19	upstream	5af4055fa813	62ee0987	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/06 20:44	upstream	60a9483534ed	62ee0987	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/06 07:55	upstream	60a9483534ed	0a63fd36	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/05 14:34	upstream	f6274b06e326	8a6b1a8d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/05 10:50	upstream	f6274b06e326	ce697b49	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/04 23:48	upstream	84b3e42564ac	ce697b49	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/04 23:36	upstream	84b3e42564ac	ce697b49	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/04 14:15	upstream	9e1ff307c779	ce697b49	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/03 23:05	upstream	6761a0ae9895	db0f5787	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/03 14:57	upstream	7b66f4393ad4	db0f5787	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/02 19:46	upstream	ab2a7a35c4e7	db0f5787	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/02 06:40	upstream	53d5fc89d66a	db0f5787	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/01 20:23	upstream	24f67d82c43c	cc80db95	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/10/01 03:20	upstream	4de593fb965f	1d849ab4	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/30 20:54	upstream	02d5e016800d	0f01403d	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/30 05:33	upstream	02d5e016800d	be530f6c	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/29 12:47	upstream	a4e6f95a891a	e08fe937	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/29 08:18	upstream	a4e6f95a891a	d82cb927	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/28 18:18	upstream	d33bec7b3dfa	d82cb927	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/28 14:48	upstream	0513e464f900	d82cb927	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/28 01:08	upstream	0513e464f900	78494d16	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/27 11:19	upstream	5816b3e6577e	78494d16	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/27 01:41	upstream	996148ee05d0	78494d16	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/26 09:47	upstream	a3b397b4fffb	8cac236e	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/26 02:13	upstream	85736168463d	8cac236e	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/25 01:57	upstream	7d42e9818258	8cac236e	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/24 12:03	upstream	f9e36107ec70	8cac236e	.config	log	report	info	KCSAN: data-race in do_mpage_readpage / set_blocksize
ci2-upstream-kcsan-gce	2021/09/23 19:40	upstream	f10f0481a5b5	8cac236e	.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