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BUG: KCSAN: data-race in generic_fillattr / inode_set_ctime_current

write to 0xffff888104111268 of 4 bytes by task 4327 on cpu 0:
 inode_set_ctime_to_ts include/linux/fs.h:1678 [inline]
 inode_set_ctime_current+0x35/0x50 fs/inode.c:2664
 shmem_mknod+0x117/0x180 mm/shmem.c:3590
 shmem_create+0x34/0x40 mm/shmem.c:3644
 lookup_open fs/namei.c:3595 [inline]
 open_last_lookups fs/namei.c:3694 [inline]
 path_openat+0xe92/0x1fa0 fs/namei.c:3930
 do_filp_open+0xf7/0x200 fs/namei.c:3960
 do_sys_openat2+0xab/0x120 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1441
 x64_sys_call+0x1025/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:258
 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 0xffff888104111268 of 4 bytes by task 3989 on cpu 1:
 inode_get_ctime_nsec include/linux/fs.h:1663 [inline]
 inode_get_ctime include/linux/fs.h:1669 [inline]
 generic_fillattr+0x1dd/0x2f0 fs/stat.c:62
 shmem_getattr+0x17b/0x200 mm/shmem.c:1169
 vfs_getattr_nosec fs/stat.c:166 [inline]
 vfs_getattr+0x19b/0x1e0 fs/stat.c:207
 vfs_statx_path fs/stat.c:251 [inline]
 vfs_statx+0x134/0x2f0 fs/stat.c:315
 vfs_fstatat+0xec/0x110 fs/stat.c:341
 __do_sys_newfstatat fs/stat.c:505 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:499
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:499
 x64_sys_call+0x141f/0x2d60 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: 0x0fa77554 -> 0x10400bd5

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3989 Comm: udevd Not tainted 6.12.0-rc2-syzkaller-00074-gd3d1556696c1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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udevd[3989]: inotify_add_watch(7, /dev/loop2p1, 10) failed: No such file or directory