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BUG: KCSAN: data-race in generic_fillattr / touch_atime

write to 0xffff8881179849a8 of 4 bytes by task 9512 on cpu 0:
 inode_set_atime_to_ts include/linux/fs.h:1614 [inline]
 inode_update_timestamps fs/inode.c:2083 [inline]
 generic_update_time fs/inode.c:2105 [inline]
 inode_update_time fs/inode.c:2125 [inline]
 touch_atime+0x1f3/0x350 fs/inode.c:2197
 file_accessed include/linux/fs.h:2539 [inline]
 shmem_file_read_iter+0x46a/0x540 mm/shmem.c:3273
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x5dc/0x700 fs/read_write.c:565
 ksys_read+0xe8/0x1b0 fs/read_write.c:708
 __do_sys_read fs/read_write.c:717 [inline]
 __se_sys_read fs/read_write.c:715 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:715
 x64_sys_call+0x2874/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881179849a8 of 4 bytes by task 3292 on cpu 1:
 inode_get_atime_nsec include/linux/fs.h:1599 [inline]
 inode_get_atime include/linux/fs.h:1605 [inline]
 generic_fillattr+0x16f/0x330 fs/stat.c:96
 shmem_getattr+0x17b/0x200 mm/shmem.c:1177
 vfs_getattr_nosec fs/stat.c:208 [inline]
 vfs_getattr fs/stat.c:246 [inline]
 vfs_fstat+0x19d/0x200 fs/stat.c:265
 vfs_fstatat fs/stat.c:364 [inline]
 __do_sys_newfstatat fs/stat.c:530 [inline]
 __se_sys_newfstatat+0xb5/0x300 fs/stat.c:524
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:524
 x64_sys_call+0x236d/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x133328a8 -> 0x1425fef2

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3292 Comm: udevd Not tainted 6.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024
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udevd[3292]: inotify_add_watch(7, /dev/loop2p2, 10) failed: No such file or directory
udevd[3292]: inotify_add_watch(7, /dev/loop0p17, 10) failed: No such file or directory