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BUG: KCSAN: data-race in generic_fillattr / shmem_mknod

write to 0xffff888104986418 of 8 bytes by task 3216 on cpu 0:
 shmem_mknod+0xdc/0x170 mm/shmem.c:2825
 shmem_create+0x2f/0x40 mm/shmem.c:2876
 lookup_open fs/namei.c:3330 [inline]
 open_last_lookups fs/namei.c:3400 [inline]
 path_openat+0xc79/0x1f30 fs/namei.c:3606
 do_filp_open+0x105/0x220 fs/namei.c:3636
 do_sys_openat2+0xb5/0x2b0 fs/open.c:1214
 do_sys_open fs/open.c:1230 [inline]
 __do_sys_openat fs/open.c:1246 [inline]
 __se_sys_openat fs/open.c:1241 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1241
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888104986418 of 8 bytes by task 4790 on cpu 1:
 i_size_read include/linux/fs.h:885 [inline]
 generic_fillattr+0x203/0x2b0 fs/stat.c:53
 vfs_getattr_nosec fs/stat.c:126 [inline]
 vfs_getattr fs/stat.c:160 [inline]
 vfs_statx+0x265/0x3c0 fs/stat.c:225
 vfs_fstatat fs/stat.c:243 [inline]
 __do_sys_newfstatat fs/stat.c:412 [inline]
 __se_sys_newfstatat+0x63/0x260 fs/stat.c:406
 __x64_sys_newfstatat+0x51/0x60 fs/stat.c:406
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000001874 -> 0x0000000000001888

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4790 Comm: udevd Tainted: G        W         5.17.0-rc7-syzkaller-00205-g79b00034e9dc-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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