extmem.7c6a46 Querying a DCSS type failed with rc=<return code>
Explanation
The DCSS kernel interface used z/VM diagnose call X'64' to query the
type of a DCSS. z/VM failed to determine the type and returned an error.
User response
Look for related messages to find out which DCSS is affected.
For details about the return codes see the section about DIAGNOSE Code
X'64' in "z/VM CP Programming Services".