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: 458d, last: 1h06m

Sample crash report:

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

write to 0xffff888100af24d8 of 8 bytes by task 28215 on cpu 0:
 shmem_unlink+0x143/0x1d0 mm/shmem.c:2931
 shmem_rename2+0x2fd/0x440 mm/shmem.c:3029
 vfs_rename+0x9d9/0xe20 fs/namei.c:4628
 do_renameat2+0x6d7/0xa20 fs/namei.c:4779
 __do_sys_rename fs/namei.c:4825 [inline]
 __se_sys_rename fs/namei.c:4823 [inline]
 __x64_sys_rename+0x58/0x60 fs/namei.c:4823
 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 0xffff888100af24d8 of 8 bytes by task 28225 on cpu 1:
 i_size_read include/linux/fs.h:894 [inline]
 generic_fillattr fs/stat.c:53 [inline]
 vfs_getattr_nosec+0x242/0x2f0 fs/stat.c:126
 vfs_getattr fs/stat.c:160 [inline]
 vfs_statx+0x138/0x2a0 fs/stat.c:225
 vfs_fstatat fs/stat.c:243 [inline]
 vfs_stat include/linux/fs.h:3352 [inline]
 __do_sys_newstat fs/stat.c:385 [inline]
 __se_sys_newstat+0x5d/0x250 fs/stat.c:381
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:381
 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: 0x0000000000002d00 -> 0x0000000000002cec

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 28225 Comm: systemd-udevd Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (695):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/09/20 08:12	upstream	e4e737bb5c17	3d9c9a2a	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/20 02:31	upstream	20621d2f27a0	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/19 12:04	upstream	d4d016caa4b8	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/18 22:23	upstream	93ff9f13be91	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/18 09:03	upstream	4357f03d6611	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/17 19:47	upstream	ddf21bd8ab98	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/17 15:34	upstream	bdb575f87217	70b76c1d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/17 03:37	upstream	bdb575f87217	5b989942	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/16 16:50	upstream	ff1ffd71d5f0	aae492f2	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/16 08:42	upstream	ff1ffd71d5f0	07e953c1	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/15 21:38	upstream	80be5998ad63	07e953c1	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/15 07:59	upstream	3ca706c189db	07e953c1	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/14 17:54	upstream	1619b69edce1	07e953c1	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/14 10:58	upstream	d0ee23f9d78b	58d09404	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/13 18:41	upstream	6880fa6c5660	58d09404	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/13 03:38	upstream	6880fa6c5660	3ce60af8	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/12 14:17	upstream	78e709522d2c	3ce60af8	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/12 01:56	upstream	c605c39677b9	3ce60af8	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/11 12:52	upstream	926de8c4326c	3ce60af8	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/10 23:23	upstream	e99f23c5bf59	3ce60af8	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/10 10:54	upstream	bf9f243f23e6	5ae8508a	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/10 02:48	upstream	bf9f243f23e6	e2776ee4	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/09 13:51	upstream	a3fa7a101dcf	e2776ee4	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/08 23:52	upstream	2d338201d531	e2776ee4	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/08 11:22	upstream	ac08b1c68d1b	e2776ee4	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/07 22:42	upstream	0bcfe68b8767	064c9eb7	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/07 00:22	upstream	4b93c544e90e	6ca60148	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/06 11:34	upstream	27151f177827	6ca60148	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/03 11:13	upstream	a9c9a6f741cd	d236a457	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/03 02:19	upstream	7ba88a2a09f4	f62a5829	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/02 12:44	upstream	4ac6d90867a4	d0f0970b	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/02 08:25	upstream	4ac6d90867a4	7eb7e152	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/09/01 18:31	upstream	835d31d319d9	7eb7e152	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/31 16:30	upstream	b91db6a0b52e	7eb7e152	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/31 00:35	upstream	8596e589b787	8f58a0ef	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/30 12:43	upstream	7d2a07b76933	8f58a0ef	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/30 01:01	upstream	537b57bd5a20	be2c130d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/28 20:00	upstream	3f5ad13cb012	be2c130d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/28 17:25	upstream	64b4fc45bea6	be2c130d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/28 05:29	upstream	64b4fc45bea6	d5a29e53	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/27 22:11	upstream	1a6436f37512	57b01c6e	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/27 12:53	upstream	77dd11439b86	b318694d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/26 21:38	upstream	1a6d80ff2419	b318694d	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/26 11:18	upstream	73f3af7b4611	b599f2fc	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/25 22:30	upstream	fe67f4dd8daa	b599f2fc	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/08/24 18:47	upstream	6e764bcd1cf7	b599f2fc	.config	log	report	info	KCSAN: data-race in shmem_unlink / vfs_getattr_nosec
ci2-upstream-kcsan-gce	2021/01/17 02:03	upstream	54c6247d06f1	65a7a854	.config	log	report	info
ci2-upstream-kcsan-gce	2020/07/18 19:37	upstream	6cf7ccba29dc	9c812472	.config	log	report
ci2-upstream-kcsan-gce	2020/07/15 22:02	upstream	e9919e11e219	ada108d0	.config	log	report
ci2-upstream-kcsan-gce	2020/06/18 16:18	upstream	1b5044021070	3ea11d3f	.config	log	report