KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate

KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
Status: moderation: reported on 2020/08/31 00:28
Reported-by: syzbot+18c763eeb28dd25d2d9e@syzkaller.appspotmail.com
First crash: 531d, last: 2h43m

Sample crash report:

==================================================================
BUG: KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new

write to 0xffff88815f0d96a0 of 8 bytes by task 31125 on cpu 0:
 d_instantiate_new+0x99/0xe0 fs/dcache.c:2031
 ext4_add_nondir+0x172/0x1a0 fs/ext4/namei.c:2714
 ext4_symlink+0x4ba/0x700 fs/ext4/namei.c:3363
 vfs_symlink+0x241/0x330 fs/namei.c:4248
 do_symlinkat+0x104/0x380 fs/namei.c:4277
 __do_sys_symlink fs/namei.c:4299 [inline]
 __se_sys_symlink fs/namei.c:4297 [inline]
 __x64_sys_symlink+0x52/0x60 fs/namei.c:4297
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88815f0d96a0 of 8 bytes by task 31127 on cpu 1:
 inode_is_dirtytime_only include/linux/fs.h:2470 [inline]
 __ext4_update_other_inode_time+0x45/0x550 fs/ext4/inode.c:5010
 ext4_update_other_inodes_time fs/ext4/inode.c:5053 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5102 [inline]
 ext4_mark_iloc_dirty+0x4c6/0x890 fs/ext4/inode.c:5694
 __ext4_mark_inode_dirty+0x4ec/0x5f0 fs/ext4/inode.c:5890
 __ext4_new_inode+0x2a7f/0x2fc0 fs/ext4/ialloc.c:1343
 ext4_symlink+0x2cc/0x700 fs/ext4/namei.c:3293
 vfs_symlink+0x241/0x330 fs/namei.c:4248
 do_symlinkat+0x104/0x380 fs/namei.c:4277
 __do_sys_symlink fs/namei.c:4299 [inline]
 __se_sys_symlink fs/namei.c:4297 [inline]
 __x64_sys_symlink+0x52/0x60 fs/namei.c:4297
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000008008 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31127 Comm: syz-executor.4 Not tainted 5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (391):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/12/08 10:15	upstream	2a987e65025e	a4a2a501	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/08 01:30	upstream	2a987e65025e	0230ba3e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/07 11:42	upstream	cd8c917a56f2	0230ba3e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/06 23:00	upstream	f80ef9e49fdf	0230ba3e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/06 14:46	upstream	0fcfb00b28c0	579a8754	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/06 09:46	upstream	0fcfb00b28c0	a617004c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/05 19:52	upstream	944207047ca4	a617004c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/05 07:00	upstream	79a72162048e	a617004c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/04 18:23	upstream	bbef3c7a63d2	a617004c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/04 00:19	upstream	12119cfa1052	a617004c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/03 11:54	upstream	5f58da2befa5	c7c20675	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/03 09:08	upstream	5f58da2befa5	61f86278	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/02 20:14	upstream	a51e3ac43ddb	61f86278	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/12/01 08:20	upstream	58e1100fdc59	5fa3eacc	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/30 18:51	upstream	f080815fdb3e	80270552	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/30 11:53	upstream	d58071a8a76d	80270552	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/29 14:58	upstream	d58071a8a76d	d0830353	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/29 11:41	upstream	d58071a8a76d	63eeac02	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/28 21:59	upstream	d06c942efea4	63eeac02	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/26 22:38	upstream	c5c17547b778	63eeac02	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/26 11:50	upstream	a4849f6000e2	63eeac02	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/25 19:53	upstream	b501b85957de	63eeac02	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/25 18:34	upstream	5f53fa508db0	63eeac02	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/24 19:39	upstream	5f53fa508db0	545ab074	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/23 22:29	upstream	5d9f4cf36721	545ab074	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/22 13:48	upstream	136057256686	545ab074	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/22 11:48	upstream	136057256686	4eb20a4e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/21 22:48	upstream	40c93d7fff6f	4eb20a4e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/21 09:50	upstream	923dcc5eb0c1	4eb20a4e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/20 20:30	upstream	61564e7b3abc	4eb20a4e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/20 03:13	upstream	a90af8f15bdc	4eb20a4e	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/19 15:02	upstream	4c388a8e740d	3a9d0024	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/19 11:00	upstream	4c388a8e740d	31a30fc0	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/18 21:59	upstream	6fdf886424cf	31a30fc0	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/18 14:28	upstream	42eb8fdac2fc	31a30fc0	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/18 07:52	upstream	42eb8fdac2fc	cafff8b6	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/17 17:32	upstream	ee1703cda8dc	cafff8b6	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/16 22:47	upstream	8ab774587903	cafff8b6	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/16 10:33	upstream	8ab774587903	600426bd	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/14 22:11	upstream	ce49bfc8d037	75b04091	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/14 11:45	upstream	c8c109546a19	75b04091	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/11/13 05:52	upstream	66f4beaa6c1d	75b04091	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/01/13 12:59	upstream	e609571b5ffa	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/30 06:35	upstream	1127b219ce94	d5a3ae1f	.config	log	report
ci2-upstream-kcsan-gce	2020/08/27 00:12	upstream	15bc20c6af4c	318430cb	.config	log	report
ci2-upstream-kcsan-gce	2020/06/25 08:40	upstream	26e122e97a3d	9d60b18e	.config	log	report