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BUG: KCSAN: data-race in shmem_mknod / vfs_getattr_nosec

read-write to 0xffff888106fd39b0 of 8 bytes by task 10988 on cpu 0:
 shmem_mknod+0xd1/0x160 mm/shmem.c:2937
 shmem_create+0x27/0x30 mm/shmem.c:2985
 lookup_open fs/namei.c:3106 [inline]
 open_last_lookups fs/namei.c:3180 [inline]
 path_openat+0xcc9/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x240 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888106fd39b0 of 8 bytes by task 10733 on cpu 1:
 i_size_read include/linux/fs.h:848 [inline]
 generic_fillattr fs/stat.c:45 [inline]
 vfs_getattr_nosec+0x263/0x320 fs/stat.c:90
 vfs_getattr fs/stat.c:124 [inline]
 vfs_statx+0x128/0x270 fs/stat.c:189
 vfs_fstatat fs/stat.c:207 [inline]
 vfs_stat include/linux/fs.h:3118 [inline]
 __do_sys_newstat fs/stat.c:349 [inline]
 __se_sys_newstat+0x46/0x250 fs/stat.c:345
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:345
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10733 Comm: systemd-udevd Not tainted 5.11.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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