KCSAN: data-race in inode_set_ctime_to_ts / inode_set_ctime_to

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in inode_set_ctime_to_ts / inode_set_ctime_to_ts kernfs	6				1	325d	325d	0/29	auto-obsoleted due to no activity on 2025/04/01 13:08

==================================================================
BUG: KCSAN: data-race in inode_set_ctime_to_ts / inode_set_ctime_to_ts

write to 0xffff888100752ed8 of 8 bytes by task 3326 on cpu 0:
 inode_set_ctime_to_ts+0x72/0x170 fs/inode.c:2744
 set_inode_attr fs/kernfs/inode.c:165 [inline]
 kernfs_refresh_inode fs/kernfs/inode.c:179 [inline]
 kernfs_iop_permission+0x190/0x220 fs/kernfs/inode.c:290
 do_inode_permission fs/namei.c:526 [inline]
 inode_permission+0x2de/0x3c0 fs/namei.c:596
 lookup_inode_permission_may_exec fs/namei.c:636 [inline]
 may_lookup fs/namei.c:1915 [inline]
 link_path_walk+0xaf6/0xe30 fs/namei.c:2537
 path_parentat fs/namei.c:2793 [inline]
 __filename_parentat+0x15c/0x3f0 fs/namei.c:2817
 filename_parentat fs/namei.c:2835 [inline]
 filename_create+0x78/0x210 fs/namei.c:4860
 do_mkdirat+0x82/0x3b0 fs/namei.c:5156
 __do_sys_mkdirat fs/namei.c:5186 [inline]
 __se_sys_mkdirat fs/namei.c:5184 [inline]
 __x64_sys_mkdirat+0x4c/0x60 fs/namei.c:5184
 x64_sys_call+0x30c/0x3000 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888100752ed8 of 8 bytes by task 3319 on cpu 1:
 inode_set_ctime_to_ts+0x72/0x170 fs/inode.c:2744
 set_inode_attr fs/kernfs/inode.c:165 [inline]
 kernfs_refresh_inode fs/kernfs/inode.c:179 [inline]
 kernfs_iop_permission+0x190/0x220 fs/kernfs/inode.c:290
 do_inode_permission fs/namei.c:526 [inline]
 inode_permission+0x2de/0x3c0 fs/namei.c:596
 lookup_inode_permission_may_exec fs/namei.c:636 [inline]
 may_lookup fs/namei.c:1915 [inline]
 link_path_walk+0xaf6/0xe30 fs/namei.c:2537
 path_parentat fs/namei.c:2793 [inline]
 __filename_parentat+0x15c/0x3f0 fs/namei.c:2817
 filename_parentat fs/namei.c:2835 [inline]
 filename_create+0x78/0x210 fs/namei.c:4860
 do_mkdirat+0x82/0x3b0 fs/namei.c:5156
 __do_sys_mkdirat fs/namei.c:5186 [inline]
 __se_sys_mkdirat fs/namei.c:5184 [inline]
 __x64_sys_mkdirat+0x4c/0x60 fs/namei.c:5184
 x64_sys_call+0x30c/0x3000 arch/x86/include/generated/asm/syscalls_64.h:259
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000069443e1c -> 0x0000000069443e1d

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3319 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
==================================================================

Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/12/18 17:47	upstream	ea1013c15392	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in inode_set_ctime_to_ts / inode_set_ctime_to_ts
2025/10/26 15:42	upstream	72761a7e3122	c0460fcd	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-upstream-kcsan-gce	KCSAN: data-race in inode_set_ctime_to_ts / inode_set_ctime_to_ts