In cases where the next unique ID or file/directory count of the in-core Logical Volume Integrity Descriptor have been updated, a sync() causes a (corrupt) LVID with a stale CRC to be written to disk.
Ordinarily, this is corrected by an update of the on-disk LVID that occurs when the filesystem is unmounted. However, if power is lost or the filesystem resides on a device that is surprise-removed, the corrupt LVID remains and can complicate later remounting or fsck/chkdsk.
