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: 366d, last: 49m

Sample crash report:

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

write to 0xffff888102a29360 of 8 bytes by task 3581 on cpu 0:
 shmem_unlink+0x143/0x1d0 mm/shmem.c:2965
 shmem_rename2+0x2fd/0x440 mm/shmem.c:3063
 vfs_rename+0xa03/0xfb0 fs/namei.c:4541
 do_renameat2+0x59e/0x9b0 fs/namei.c:4696
 __do_sys_rename fs/namei.c:4745 [inline]
 __se_sys_rename fs/namei.c:4743 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4743
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888102a29360 of 8 bytes by task 3564 on cpu 1:
 i_size_read include/linux/fs.h:849 [inline]
 generic_fillattr fs/stat.c:53 [inline]
 vfs_getattr_nosec+0x23d/0x2f0 fs/stat.c:108
 vfs_getattr fs/stat.c:142 [inline]
 vfs_statx+0x128/0x290 fs/stat.c:207
 vfs_fstatat fs/stat.c:225 [inline]
 vfs_stat include/linux/fs.h:3380 [inline]
 __do_sys_newstat fs/stat.c:367 [inline]
 __se_sys_newstat+0x46/0x250 fs/stat.c:363
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:363
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000002aa8 -> 0x0000000000002a94

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3564 Comm: systemd-udevd Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (518):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/06/20 01:05	upstream	913ec3c2	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/19 12:17	upstream	9ed13a17	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/18 23:17	upstream	b1edae0d	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/18 11:23	upstream	fd0aa1a4	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/17 14:06	upstream	70585216	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/17 02:15	upstream	6b00bc63	aba2b2fb	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/16 18:32	upstream	6b00bc63	c06f97ad	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/16 10:26	upstream	94f0b2d4	c06f97ad	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/15 22:36	upstream	94f0b2d4	990d3cbe	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/15 19:30	upstream	94f0b2d4	8022d7e3	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/15 13:42	upstream	009c9aa5	8022d7e3	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/14 11:22	upstream	009c9aa5	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/13 22:43	upstream	e4e45343	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/13 04:34	upstream	8ecfa36c	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/12 13:30	upstream	ad347abe	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/12 00:23	upstream	f21b807c	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/11 10:58	upstream	06af8679	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/10 22:13	upstream	f09eacca	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/10 04:14	upstream	cd1245d7	1ba81399	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/09 15:06	upstream	368094df	84fe5d96	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/09 08:22	upstream	368094df	5c2fe346	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/08 21:18	upstream	4c8684fe	5c2fe346	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/08 08:51	upstream	614124be	5c2fe346	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/07 18:38	upstream	614124be	b718257f	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/07 07:08	upstream	614124be	e59537be	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/06 20:45	upstream	decad3e1	500c2339	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/06 02:22	upstream	f5b6eb1e	500c2339	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/05 12:36	upstream	9d32fa5d	500c2339	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/04 21:29	upstream	16f0596f	500c2339	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/04 18:32	upstream	16f0596f	966a236b	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/04 12:49	upstream	f88cd3fb	966a236b	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/03 20:18	upstream	f88cd3fb	0740de69	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/02 21:00	upstream	324c92e5	0740de69	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/02 08:22	upstream	231bc539	0740de69	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/06/02 06:04	upstream	231bc539	032639db	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/31 17:49	upstream	c2131f7e	032639db	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/31 11:20	upstream	8124c8a6	032639db	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/31 00:21	upstream	8124c8a6	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/30 09:00	upstream	b90e90f4	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/29 23:22	upstream	f956cb99	325a8dab	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/29 09:15	upstream	6799d4f2	858ea628	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/28 19:22	upstream	5ff2756a	858ea628	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/28 03:13	upstream	97e5bf60	858ea628	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/27 14:19	upstream	d7c5303f	858ea628	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/26 23:27	upstream	7ac3a1c1	858ea628	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/26 10:14	upstream	ad9f25d3	750ce164	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/26 09:04	upstream	ad9f25d3	93d3a9f6	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/05/25 18:37	upstream	a050a6d2	93d3a9f6	.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