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BUG: KCSAN: data-race in generic_fillattr / shmem_mknod

write to 0xffff888103d8c3e0 of 8 bytes by task 3071 on cpu 0:
 inode_set_mtime_to_ts include/linux/fs.h:1587 [inline]
 shmem_mknod+0x136/0x180 mm/shmem.c:3285
 shmem_create+0x34/0x40 mm/shmem.c:3339
 lookup_open fs/namei.c:3505 [inline]
 open_last_lookups fs/namei.c:3574 [inline]
 path_openat+0xdde/0x1da0 fs/namei.c:3804
 do_filp_open+0xf7/0x200 fs/namei.c:3834
 do_sys_openat2+0xab/0x120 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1431
 x64_sys_call+0x1057/0x2d70 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 0xffff888103d8c3e0 of 8 bytes by task 3383 on cpu 1:
 inode_get_mtime include/linux/fs.h:1581 [inline]
 generic_fillattr+0x1a6/0x2f0 fs/stat.c:61
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x19b/0x1e0 fs/stat.c:176
 vfs_statx+0x140/0x320 fs/stat.c:248
 vfs_fstatat+0xcd/0x100 fs/stat.c:304
 __do_sys_newfstatat fs/stat.c:468 [inline]
 __se_sys_newfstatat+0x58/0x260 fs/stat.c:462
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:462
 x64_sys_call+0x1451/0x2d70 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: 0x000000002ece9385 -> 0x000000003130ed86

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3383 Comm: udevd Not tainted 6.10.0-rc4-syzkaller-00035-g3d54351c64e8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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