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BUG: KCSAN: data-race in generic_fillattr / shmem_mknod

read-write to 0xffff8881049a9408 of 8 bytes by task 3383 on cpu 0:
 shmem_mknod+0xdd/0x180 mm/shmem.c:2942
 shmem_create+0x34/0x40 mm/shmem.c:2994
 lookup_open fs/namei.c:3416 [inline]
 open_last_lookups fs/namei.c:3484 [inline]
 path_openat+0xd96/0x1d00 fs/namei.c:3712
 do_filp_open+0xf6/0x200 fs/namei.c:3742
 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0xf3/0x120 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881049a9408 of 8 bytes by task 4291 on cpu 1:
 i_size_read include/linux/fs.h:866 [inline]
 generic_fillattr+0x13f/0x1e0 fs/stat.c:58
 shmem_getattr+0x32a/0x3b0 mm/shmem.c:1068
 vfs_getattr_nosec+0x1e3/0x3c0 fs/stat.c:133
 vfs_getattr fs/stat.c:170 [inline]
 vfs_statx+0x156/0x300 fs/stat.c:242
 vfs_fstatat fs/stat.c:276 [inline]
 __do_sys_newfstatat fs/stat.c:446 [inline]
 __se_sys_newfstatat+0x8a/0x2a0 fs/stat.c:440
 __x64_sys_newfstatat+0x55/0x60 fs/stat.c:440
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000001644 -> 0x0000000000001658

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4291 Comm: udevd Not tainted 6.3.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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