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BUG: KCSAN: data-race in drop_nlink / vfs_getattr_nosec

write to 0xffff888105db3898 of 4 bytes by task 5848 on cpu 1:
 drop_nlink+0x37/0x90 fs/inode.c:305
 shmem_unlink+0x1ab/0x1d0 mm/shmem.c:2967
 vfs_unlink+0x24a/0x400 fs/namei.c:4025
 do_unlinkat+0x238/0x4f0 fs/namei.c:4092
 __do_sys_unlink fs/namei.c:4139 [inline]
 __se_sys_unlink fs/namei.c:4137 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4137
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888105db3898 of 4 bytes by task 5889 on cpu 0:
 generic_fillattr fs/stat.c:49 [inline]
 vfs_getattr_nosec+0x1c1/0x2f0 fs/stat.c:108
 vfs_getattr fs/stat.c:142 [inline]
 vfs_statx+0x128/0x290 fs/stat.c:207
 vfs_fstatat fs/stat.c:225 [inline]
 vfs_lstat include/linux/fs.h:3384 [inline]
 __do_sys_newlstat fs/stat.c:380 [inline]
 __se_sys_newlstat+0x46/0x250 fs/stat.c:374
 __x64_sys_newlstat+0x2d/0x40 fs/stat.c:374
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5889 Comm: systemd-udevd Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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