Processor Halt Codes Manual

Cause
The global update protocol, which keeps all processors synchronized, became unsynchronized.
This is an operating system kernel logic error.
Effect
The unsynchronized processor freezes. If system freeze is not enabled on the system, the global
update request (a destination control table update, for example) also fails, but it is automatically
retried to the remaining processors.
Recovery
Refer to Processor Halt Monitoring and Recovery (page 10). Take a memory dump and contact
your service provider or the Global NonStop Solution Center (GNSC), as directed by your local
operating procedures.
%004020
Cause
After the failure of another processor, a global update could not be resent.
Effect
The processor halts. The rest of the system is not affected.
Recovery
Refer to Processor Halt Monitoring and Recovery (page 10). Take a memory dump and contact
your service provider or the Global NonStop Solution Center (GNSC), as directed by your local
operating procedures.
%004021
Cause
The hardware flagged a checksum error on an incoming packet, but a software calculation of
the checksum indicates that the checksum was correct.
Effect
All freeze-enabled processors halt.
Recovery
Refer to Processor Halt Monitoring and Recovery (page 10). Take a memory dump and contact
your service provider or the Global NonStop Solution Center (GNSC), as directed by your local
operating procedures.
%004022
Cause
An internal inconsistency was found in the FOX monitor.
Effect
All freeze-enabled processors halt.
Recovery
Refer to Processor Halt Monitoring and Recovery (page 10). Take a memory dump and contact
your service provider or the Global NonStop Solution Center (GNSC), as directed by your local
operating procedures.
%004023 through %004030
Cause
Inconsistencies occurred in the message-system data structures.
142 Software Halt Code Descriptions