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: 394d, last: 1h01m

Sample crash report:

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

write to 0xffff8881326fecf8 of 8 bytes by task 32587 on cpu 1:
 d_instantiate_new+0x99/0x110 fs/dcache.c:2031
 ext4_add_nondir+0x172/0x1a0 fs/ext4/namei.c:2706
 ext4_symlink+0x4b1/0x700 fs/ext4/namei.c:3535
 vfs_symlink+0x23a/0x300 fs/namei.c:4182
 do_symlinkat+0xeb/0x280 fs/namei.c:4212
 __do_sys_symlink fs/namei.c:4233 [inline]
 __se_sys_symlink fs/namei.c:4231 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4231
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881326fecf8 of 8 bytes by task 32588 on cpu 0:
 inode_is_dirtytime_only include/linux/fs.h:2422 [inline]
 __ext4_update_other_inode_time+0x48/0x5c0 fs/ext4/inode.c:4963
 ext4_update_other_inodes_time fs/ext4/inode.c:5006 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5135 [inline]
 ext4_mark_iloc_dirty+0x12b6/0x1750 fs/ext4/inode.c:5724
 ext4_xattr_set_handle+0xf6e/0x1110 fs/ext4/xattr.c:2395
 ext4_initxattrs+0x66/0xb0 fs/ext4/xattr_security.c:44
 security_inode_init_security+0x1a9/0x260 security/security.c:1098
 ext4_init_security+0x30/0x40 fs/ext4/xattr_security.c:58
 __ext4_new_inode+0x29a1/0x2f70 fs/ext4/ialloc.c:1320
 ext4_symlink+0x2c3/0x700 fs/ext4/namei.c:3465
 vfs_symlink+0x23a/0x300 fs/namei.c:4182
 do_symlinkat+0xeb/0x280 fs/namei.c:4212
 __do_sys_symlink fs/namei.c:4233 [inline]
 __se_sys_symlink fs/namei.c:4231 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4231
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000008008 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 32588 Comm: syz-executor.3 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (225):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/07/24 09:16	upstream	f0fddcec6b62	bc5f1d88	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/23 14:17	upstream	8baef6386baa	bc5f1d88	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/22 10:26	upstream	3d5895cd3517	29c3f20f	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/21 20:55	upstream	7b6ae471e541	29c3f20f	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/21 13:52	upstream	8cae8cd89f05	29c3f20f	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/20 13:19	upstream	8cae8cd89f05	1b201b48	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/19 20:03	upstream	2734d6c1b1a0	e6a17580	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/19 02:33	upstream	f0eb870a8422	f115ae98	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/18 03:06	upstream	1d67c8d993ba	f115ae98	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/17 20:47	upstream	d980cc0620ae	f115ae98	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/16 23:30	upstream	0d18c12b288a	f115ae98	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/16 12:03	upstream	d936eb238744	f115ae98	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/14 02:59	upstream	40226a3d96ef	484502bd	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/13 17:57	upstream	7fef2edf7cc7	70168d5c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/10 08:50	upstream	3dbdb38e2869	8f5a7b8c	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/08 13:15	upstream	3dbdb38e2869	1aade754	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/07 20:01	upstream	3dbdb38e2869	95793bce	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/07 07:06	upstream	3dbdb38e2869	4846d5c1	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/06 20:19	upstream	3dbdb38e2869	cca78469	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/07/04 03:27	upstream	3dbdb38e2869	55aa55c2	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/29 20:20	upstream	c54b245d0118	a4fccb01	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/29 17:09	upstream	c54b245d0118	9d2ab5df	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/29 04:14	upstream	122fa8c58831	9d2ab5df	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/27 14:12	upstream	625acffd7ae2	9d2ab5df	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/26 11:15	upstream	b7050b242430	9d2ab5df	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/25 22:10	upstream	44db63d1ad8d	ae6bf8dd	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/24 04:59	upstream	7266f2030eb0	fe4ab389	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/23 00:27	upstream	0c18f29aae7c	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/21 23:59	upstream	a96bfed64c89	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/21 10:43	upstream	13311e74253f	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/20 19:35	upstream	cba5e97280f5	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/19 23:27	upstream	913ec3c22ef4	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/18 19:50	upstream	b1edae0d5f2e	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/17 16:10	upstream	70585216fe77	aba2b2fb	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/16 17:37	upstream	6b00bc639f1f	c06f97ad	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/15 11:02	upstream	009c9aa5be65	8022d7e3	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/14 11:07	upstream	009c9aa5be65	1ba81399	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/12 04:39	upstream	f21b807c3cf8	1ba81399	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/11 01:32	upstream	f09eacca59d2	1ba81399	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/10 00:46	upstream	cd1245d75ce9	1ba81399	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/09 13:12	upstream	368094df48e6	84fe5d96	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/08 17:56	upstream	4c8684fe555e	5c2fe346	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/08 08:29	upstream	614124bea77e	5c2fe346	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/07 19:52	upstream	614124bea77e	b718257f	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/06 21:15	upstream	decad3e1d1ed	500c2339	.config	log	report	info	KCSAN: data-race in __ext4_update_other_inode_time / d_instantiate_new
ci2-upstream-kcsan-gce	2021/06/06 01:01	upstream	f5b6eb1e0182	500c2339	.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