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BUG: KCSAN: data-race in generic_fillattr / shmem_mknod

read to 0xffff8881260d11a8 of 16 bytes by task 10878 on cpu 1:
 generic_fillattr+0x16a/0x1e0 fs/stat.c:47
 vfs_getattr_nosec+0x155/0x160 fs/stat.c:86
 vfs_getattr+0x53/0x70 fs/stat.c:120
 vfs_statx+0x104/0x190 fs/stat.c:201
 vfs_stat include/linux/fs.h:3279 [inline]
 __do_sys_newstat+0x50/0xb0 fs/stat.c:351
 __se_sys_newstat fs/stat.c:347 [inline]
 __x64_sys_newstat+0x37/0x50 fs/stat.c:347
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8881260d11a8 of 16 bytes by task 10871 on cpu 0:
 shmem_mknod+0x12f/0x180 mm/shmem.c:2893
 shmem_create+0x30/0x40 mm/shmem.c:2940
 lookup_open fs/namei.c:3081 [inline]
 open_last_lookups fs/namei.c:3155 [inline]
 path_openat+0x1f95/0x23d0 fs/namei.c:3343
 do_filp_open+0x11e/0x1b0 fs/namei.c:3373
 do_sys_openat2+0x52e/0x680 fs/open.c:1148
 do_sys_open+0xa2/0x110 fs/open.c:1164
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_open fs/open.c:1170 [inline]
 __se_sys_open fs/open.c:1168 [inline]
 __x64_sys_open+0x50/0x60 fs/open.c:1168
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10871 Comm: systemd-udevd Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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