KCSAN: data-race in generic_fillattr / simple_rename

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in generic_fillattr / simple_rename_timestamp (2) fs				1	3d16h	3d16h	0/28	moderation: reported on 2024/10/02 05:30

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BUG: KCSAN: data-race in generic_fillattr / simple_rename_timestamp

write to 0xffff88810420d870 of 8 bytes by task 11128 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1571 [inline]
 simple_rename_timestamp+0x50/0xd0 fs/libfs.c:721
 shmem_rename2+0x28c/0x2c0 mm/shmem.c:3461
 vfs_rename+0x867/0x9c0 fs/namei.c:4879
 do_renameat2+0x732/0xa60 fs/namei.c:5036
 __do_sys_rename fs/namei.c:5083 [inline]
 __se_sys_rename fs/namei.c:5081 [inline]
 __x64_sys_rename+0x5c/0x70 fs/namei.c:5081
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88810420d870 of 8 bytes by task 16157 on cpu 0:
 inode_get_mtime include/linux/fs.h:1565 [inline]
 generic_fillattr+0x1a6/0x2f0 fs/stat.c:61
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x198/0x1e0 fs/stat.c:176
 vfs_statx+0x140/0x320 fs/stat.c:248
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:462
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000000002500eb0d -> 0x000000002599818d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16157 Comm: udevd Not tainted 6.8.0-rc3-syzkaller-00010-g6d280f4d760e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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