z/VM: System Messages and Codes Š CP - z/VM - IBM

DGB001 DGG002
failure) after the current task incremented the counter,
but before the current decrement.
Since the deferred execution counter is the general
mechanism to record outstanding CP work, its
mismanagement can result in:
v A hung (or ″ghost″) user. This can occur if
VMDDFRWK is incremented and never decremented.
v This DFR017 abend (when VMDDFRWK is
decremented without a prior increment).
v A STK017 abend. This can occur if VMDDFRWK is
not used when CP work is deferred. If the user (or
VMDBK) completes logoff, the abend occurs on
resumption of the deferred work (see the STK017
abend description).
DGB001
Explanation: (soft abend) The number of active I/O
requests (VMDIOACT) exceeded the number of defined
devices (VMDDEVCT), or VMDIOACT was not a
positive number while I/O was active.
System operation continues.
User Response: Examine the VDEV blocks for the
virtual machine to determine how many requests were
active at the time of the dump. Examine the system
trace table to determine when the active requests were
started, and what requests became inactive during this
interval. Analyze the modules that incremented and/or
decremented the VMDIOACT count. If the modules that
update the field VMDIOACT contain correct logic, try to
determine how the data in the field was destroyed.
DGB002
Explanation: (soft abend) The system is unable to
continue processing because of an internal CP error.
The code found in R14 indicates which error was
detected.
The following is a description of these codes:
R14 = 1
R14 = 2
R14 = 3
An unexpected return code was received from
HCPDBIGL. Either the SBILIST length passed
was greater than 4KB, or an undocumented
return code was passed. Examine R15 to
determine what return code was returned from
HCPDBIGL.
An unexpected return code was received from
HCPDPSRW. DVICHSIZ field has been
corrupted.
An unexpected return code was received from
HCPDPSTB. Examine R15 to see the return
code.
32 z/VM: System Messages and Codes — CP
R14 = 4
An unexpected return code was received from
HCPDBIA4. Examine R15 to see the return
code.
User Response: Examine R15 to see the return code,
and determine why this occurred.
DGD001
Explanation: The channel programs initiated by
DIAGNOSE code x’18’ received a nonzero return code
from the untranslation routine.
User Response: Examine the host channel program,
the CSW untranslation routine, and module HCPDGD to
determine why this occurred.
DGD002
Explanation: (soft abend) The number of active I/O
requests (VMDIOACT) exceeded the number of defined
devices (VMDDEVCT), or VMDIOACT was not a
positive number while I/O was active.
System operation continues.
User Response: Examine the VDEV blocks for the
virtual machine to determine how many requests were
active at the time of the dump. Examine the system
trace table to determine when the active requests were
started, and what requests became inactive during this
interval. Analyze the modules that incremented and/or
decremented the VMDIOACT count. If the modules that
update the field VMDIOACT contain correct logic, try to
determine how the data in the field was destroyed.
DGG001
Explanation: When the device simulator was invoked
using the virtual channel simulator, the device simulator
signaled that it could not simulate a CCW.
User Response: Examine the device simulation
module to determine why it did not simulate the
command. R6 points to the VDEV block that contains
the address of the simulation routine in the field
VDEVSIMA. R10 points to the IORBK that contains the
guest absolute address of the problem CCW in the field
IORCPA.
DGG002
Explanation: Module HCPDGG received an indication
from the untranslation routine that the host channel
program ended on a CCW corresponding to a guest
CCW with the “suspend” flag validly set. The “suspend”
flag can never be validly on in a channel program
initiated by a DIAGNOSE code x’A8’ request.
User Response: Examine the guest channel program,
the host channel program, the CCW translation routines,
the CSW untranslation routine, and module HCPDGG to