syzbot

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BUG: KCSAN: data-race in setattr_copy / touch_atime

write to 0xffff88811a66a3d0 of 4 bytes by task 3296 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1687 [inline]
 setattr_copy+0x253/0x4b0 fs/attr.c:359
 shmem_setattr+0x566/0x840 mm/shmem.c:1375
 notify_change+0x806/0x890 fs/attr.c:552
 vfs_utimes+0x2fc/0x410 fs/utimes.c:66
 do_utimes_path fs/utimes.c:99 [inline]
 do_utimes+0x154/0x210 fs/utimes.c:140
 __do_sys_utimensat fs/utimes.c:159 [inline]
 __se_sys_utimensat fs/utimes.c:143 [inline]
 __x64_sys_utimensat+0xc4/0x170 fs/utimes.c:143
 x64_sys_call+0x2fba/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:281
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811a66a3d0 of 4 bytes by task 3293 on cpu 1:
 inode_get_atime_nsec include/linux/fs.h:1672 [inline]
 inode_get_atime include/linux/fs.h:1678 [inline]
 inode_update_timestamps fs/inode.c:2031 [inline]
 generic_update_time fs/inode.c:2056 [inline]
 inode_update_time fs/inode.c:2076 [inline]
 touch_atime+0x194/0x340 fs/inode.c:2148
 do_readlinkat+0x134/0x320 fs/stat.c:589
 __do_sys_readlink fs/stat.c:613 [inline]
 __se_sys_readlink fs/stat.c:610 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:610
 x64_sys_call+0x28da/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x103d880a -> 0x104a9a68

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3293 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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