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BUG: KCSAN: data-race in shmem_unlink / vfs_getattr_nosec

write to 0xffff88812040bd40 of 8 bytes by task 18687 on cpu 0:
 shmem_unlink+0x113/0x190 mm/shmem.c:2957
 vfs_unlink+0x22f/0x3d0 fs/namei.c:3825
 do_unlinkat+0x28a/0x4d0 fs/namei.c:3889
 __do_sys_unlink fs/namei.c:3936 [inline]
 __se_sys_unlink fs/namei.c:3934 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:3934
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812040bd40 of 8 bytes by task 18295 on cpu 1:
 i_size_read include/linux/fs.h:874 [inline]
 generic_fillattr fs/stat.c:45 [inline]
 vfs_getattr_nosec+0x262/0x310 fs/stat.c:90
 vfs_getattr fs/stat.c:124 [inline]
 vfs_statx+0x148/0x2b0 fs/stat.c:206
 vfs_stat include/linux/fs.h:3298 [inline]
 __do_sys_newstat fs/stat.c:361 [inline]
 __se_sys_newstat+0x46/0x250 fs/stat.c:357
 __x64_sys_newstat+0x2d/0x40 fs/stat.c:357
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18295 Comm: systemd-udevd Not tainted 5.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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