KCSAN: data-race in shmem_unlink / vfs_getattr

KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
Status: moderation: reported on 2020/07/19 22:12
Reported-by: syzbot+b8120eb8d3bc6e712970@syzkaller.appspotmail.com
First crash: 261d, last: 14h59m

Sample crash report:

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

write to 0xffff8881088276e0 of 8 bytes by task 13434 on cpu 0:
 shmem_unlink+0x117/0x1a0 mm/shmem.c:2966
 shmem_rename2+0x2fd/0x440 mm/shmem.c:3064
 vfs_rename+0x811/0xde0 fs/namei.c:4552
 do_renameat2+0x658/0x990 fs/namei.c:4707
 __do_sys_rename fs/namei.c:4756 [inline]
 __se_sys_rename fs/namei.c:4754 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4754
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881088276e0 of 8 bytes by task 11103 on cpu 1:
 i_size_read include/linux/fs.h:850 [inline]
 generic_fillattr fs/stat.c:53 [inline]
 vfs_getattr_nosec+0x287/0x340 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+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 11103 Comm: systemd-udevd Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (331):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/03/06 13:01	upstream	a38fd874	e4b4d570	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/05 19:48	upstream	280d542f	4a024a9b	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/05 01:54	upstream	cee407c5	f89ed068	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/03/04 03:08	upstream	f69d02e3	06ed56cd	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/24 12:33	upstream	c03c21ba	fcc6d71b	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/22 10:16	upstream	31caf8b2	a659b3f1	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/22 04:35	upstream	55f62bc8	a659b3f1	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/21 06:58	upstream	e767b353	3e5ed8b4	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/20 09:51	upstream	f40ddce8	3e5ed8b4	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/19 16:54	upstream	f40ddce8	f689d40a	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/18 04:38	upstream	f40ddce8	14052202	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/17 07:00	upstream	f40ddce8	052f8d9f	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/15 05:05	upstream	f40ddce8	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/14 23:56	upstream	358fecee	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/14 04:47	upstream	ac30d8ce	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/13 09:12	upstream	c6d8570e	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/13 00:58	upstream	dcc0b490	98682e5e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/11 18:08	upstream	291009f6	a5f86b15	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/11 10:07	upstream	291009f6	a52ee10a	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/09 17:34	upstream	e0756cfc	2bd9619f	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/08 00:08	upstream	b75dba7f	2ce644fc	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/07 15:36	upstream	825b5991	2ce644fc	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/06 23:47	upstream	964d069f	0655e081	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/06 21:11	upstream	1e0d27fc	0655e081	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/06 07:17	upstream	1e0d27fc	23a562df	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/05 15:41	upstream	dd86e7fa	23a562df	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/05 06:15	upstream	5c279c4c	23a562df	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/04 18:31	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/03 08:00	upstream	3aaf0a27	624dad51	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/02 11:13	upstream	88bb507a	19e09687	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/02 02:24	upstream	88bb507a	e6b95f32	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/01 17:33	upstream	1048ba83	e6b95f32	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/02/01 02:30	upstream	1048ba83	fc9fd31e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/31 18:30	upstream	6642d600	fc9fd31e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/30 16:32	upstream	0e9bcda5	fc9fd31e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/29 20:14	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/29 02:54	upstream	e5ff2cb9	7df34f59	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/28 07:48	upstream	76c057c8	eefc07f2	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/27 23:48	upstream	76c057c8	a57db36f	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/27 07:42	upstream	2ab38c17	a0ebf917	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/26 20:49	upstream	13391c60	55a7d4df	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/25 23:27	upstream	f8ad8187	52e37319	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/17 02:03	upstream	54c6247d	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/18 19:37	upstream	6cf7ccba	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/15 22:02	upstream	e9919e11	ada108d0	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 16:18	upstream	1b504402	3ea11d3f	.config	log	report