syzbot

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BUG: KCSAN: data-race in generic_fillattr / touch_atime

read to 0xffff888117bb3540 of 4 bytes by task 3289 on cpu 1:
 inode_get_atime_nsec include/linux/fs.h:1649 [inline]
 inode_get_atime include/linux/fs.h:1655 [inline]
 generic_fillattr+0x16f/0x330 fs/stat.c:96
 shmem_getattr+0x17b/0x200 mm/shmem.c:1249
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr+0x172/0x1b0 fs/stat.c:246
 vfs_statx_path fs/stat.c:283 [inline]
 vfs_statx+0x12c/0x310 fs/stat.c:349
 vfs_fstatat+0xe4/0x130 fs/stat.c:368
 __do_sys_newfstatat fs/stat.c:532 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:526
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:526
 x64_sys_call+0x2d6f/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888117bb3540 of 4 bytes by task 5319 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1664 [inline]
 inode_update_timestamps fs/inode.c:2035 [inline]
 generic_update_time fs/inode.c:2057 [inline]
 inode_update_time fs/inode.c:2077 [inline]
 touch_atime+0x1f3/0x350 fs/inode.c:2149
 do_readlinkat+0x12d/0x210 fs/stat.c:577
 __do_sys_readlink fs/stat.c:601 [inline]
 __se_sys_readlink fs/stat.c:598 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:598
 x64_sys_call+0x2a81/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x11862bac -> 0x11d6b136

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 5319 Comm: udevd Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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