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BUG: KCSAN: data-race in generic_fillattr / shmem_mknod

read-write to 0xffff88810442a410 of 8 bytes by task 3271 on cpu 1:
 shmem_mknod+0x106/0x180 mm/shmem.c:3258
 shmem_create+0x34/0x40 mm/shmem.c:3313
 lookup_open fs/namei.c:3500 [inline]
 open_last_lookups fs/namei.c:3569 [inline]
 path_openat+0xdc2/0x1d40 fs/namei.c:3799
 do_filp_open+0xf6/0x200 fs/namei.c:3829
 do_sys_openat2+0xab/0x110 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_openat fs/open.c:1435 [inline]
 __se_sys_openat fs/open.c:1430 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1430
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88810442a410 of 8 bytes by task 3288 on cpu 0:
 i_size_read include/linux/fs.h:912 [inline]
 generic_fillattr+0x144/0x2f0 fs/stat.c:59
 shmem_getattr+0x17b/0x200 mm/shmem.c:1139
 vfs_getattr_nosec fs/stat.c:135 [inline]
 vfs_getattr+0x198/0x1e0 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+0x55/0x60 fs/stat.c:462
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000001644 -> 0x0000000000001658

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 3288 Comm: udevd Not tainted 6.8.0-rc6-syzkaller-00024-ge326df53af00 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0
udevd[3288]: inotify_add_watch(7, /dev/loop0p3, 10) failed: No such file or directory
I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0