syzbot

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BUG: KCSAN: data-race in generic_fillattr / setattr_copy

write to 0xffff88811746154c of 4 bytes by task 3609 on cpu 1:
 inode_set_mtime_to_ts include/linux/fs.h:1659 [inline]
 setattr_copy+0x2de/0x4a0 fs/attr.c:363
 shmem_setattr+0x5be/0x7c0 mm/shmem.c:1385
 notify_change+0x872/0x8f0 fs/attr.c:556
 vfs_utimes+0x2fc/0x440 fs/utimes.c:67
 do_utimes_path fs/utimes.c:99 [inline]
 do_utimes+0x14d/0x210 fs/utimes.c:139
 __do_sys_utimensat fs/utimes.c:158 [inline]
 __se_sys_utimensat fs/utimes.c:142 [inline]
 __x64_sys_utimensat+0xc4/0x190 fs/utimes.c:142
 x64_sys_call+0x2bca/0x3020 arch/x86/include/generated/asm/syscalls_64.h:281
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811746154c of 4 bytes by task 3306 on cpu 0:
 inode_get_mtime_nsec include/linux/fs.h:1645 [inline]
 inode_get_mtime include/linux/fs.h:1651 [inline]
 generic_fillattr+0x20e/0x340 fs/stat.c:102
 shmem_getattr+0x181/0x200 mm/shmem.c:1302
 vfs_getattr_nosec+0x146/0x1e0 fs/stat.c:213
 vfs_getattr+0x48/0x60 fs/stat.c:262
 vfs_statx_path+0x28/0x140 fs/stat.c:299
 vfs_statx+0xc4/0x170 fs/stat.c:356
 vfs_fstatat+0x118/0x170 fs/stat.c:373
 __do_sys_newfstatat fs/stat.c:538 [inline]
 __se_sys_newfstatat+0x55/0x3e0 fs/stat.c:532
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:532
 x64_sys_call+0x2c64/0x3020 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x1e2411f4 -> 0x1fedd575

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3306 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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