KCSAN: data-race in shmem_mknod / vfs_getattr

KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
Status: moderation: reported on 2020/08/02 14:16
Reported-by: syzbot+7a06fc3f1c23166f7c87@syzkaller.appspotmail.com
First crash: 306d, last: 6h06m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in shmem_mknod / vfs_getattr_nosec

write to 0xffff888103d230c0 of 8 bytes by task 12135 on cpu 1:
 shmem_mknod+0xdc/0x170 mm/shmem.c:2874
 shmem_create+0x2f/0x40 mm/shmem.c:2925
 lookup_open fs/namei.c:3221 [inline]
 open_last_lookups fs/namei.c:3291 [inline]
 path_openat+0xcd1/0x20b0 fs/namei.c:3497
 do_filp_open+0xd9/0x1f0 fs/namei.c:3527
 do_sys_openat2+0xa3/0x250 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1207
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103d230c0 of 8 bytes by task 12149 on cpu 0:
 i_size_read include/linux/fs.h:850 [inline]
 generic_fillattr fs/stat.c:53 [inline]
 vfs_getattr_nosec+0x22f/0x2e0 fs/stat.c:100
 vfs_getattr fs/stat.c:134 [inline]
 vfs_statx+0x128/0x290 fs/stat.c:199
 vfs_fstatat fs/stat.c:217 [inline]
 vfs_stat include/linux/fs.h:3236 [inline]
 __do_sys_newstat fs/stat.c:359 [inline]
 __se_sys_newstat+0x46/0x250 fs/stat.c:355
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:355
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12149 Comm: systemd-udevd Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (415):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/21 01:17	upstream	1fe5501b	c0ced557	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/20 08:05	upstream	7af08140	c0ced557	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/19 23:14	upstream	7af08140	4285c989	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/19 07:53	upstream	bf05bf16	50f523d7	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/19 02:45	upstream	bf05bf16	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/18 13:00	upstream	c98ff1d0	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/17 23:27	upstream	194cf482	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/17 07:33	upstream	9cdbf646	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/16 17:57	upstream	2f7b98d1	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/16 14:05	upstream	7e25f40e	7e2b734b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/16 08:40	upstream	7e25f40e	c59079a6	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/15 16:27	upstream	7f75285c	c59079a6	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/14 23:07	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/14 14:28	upstream	50987bec	3134b37f	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/13 22:14	upstream	eebe426d	a184b83e	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/13 01:42	upstream	89698bec	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/12 06:54	upstream	7d900724	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/11 14:30	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/10 21:58	upstream	d4961772	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/10 10:04	upstream	4e04e751	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/09 01:16	upstream	3fb4f979	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/08 11:59	upstream	454859c5	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/08 00:22	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/07 02:10	upstream	2d743660	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/06 10:29	upstream	0a50438c	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/04 23:13	upstream	e49d033b	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/04 03:14	upstream	2023a53b	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/04 00:13	upstream	d93a0d43	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/02 23:32	upstream	0a84c2e4	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/04/02 07:46	upstream	1678e493	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/31 21:52	upstream	d19cc4bf	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/31 10:40	upstream	5e46d1b7	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/31 01:34	upstream	2bb25b3a	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/30 05:28	upstream	1e43c377	6a81331a	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/29 18:38	upstream	a5e13c6d	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/28 21:49	upstream	36a14638	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/27 05:26	upstream	0f4498ce	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/26 11:23	upstream	db24726b	a8529b82	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/26 09:27	upstream	00232240	6a383ecf	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/25 12:59	upstream	e1381380	6a383ecf	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/24 19:50	upstream	4ee998b0	607e3baf	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/23 20:31	upstream	7acac4b3	e613994b	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/22 19:02	upstream	0d02ec6b	8092f30d	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/22 03:47	upstream	5ee96fa9	bea32f74	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/21 14:48	upstream	812da4d3	4c9a64da	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/20 22:30	upstream	812da4d3	17810eae	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/20 04:58	upstream	8b12a62a	3d01c4de	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/18 01:37	upstream	6417f031	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/17 06:15	upstream	1df27313	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/16 06:23	upstream	1a4431a5	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/15 21:24	upstream	1e28eed1	fdb2bb2c	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/15 10:36	upstream	1e28eed1	cc1cff8f	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/14 23:47	upstream	75013c6c	cc1cff8f	.config	log	report	info	KCSAN: data-race in shmem_mknod / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/17 14:20	upstream	0da0a8a0	813be542	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/01 04:31	upstream	7dc6fd0f	8df85ed9	.config	log	report
ci2-upstream-kcsan-gce	2020/07/29 14:09	upstream	6ba1b005	19a8de55	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 15:50	upstream	1b504402	3ea11d3f	.config	log	report