APAR status
Closed as program error.
Error description
IBM MQ channels might go unresponsive with high CPU usage in channel process amqrmppa or runmqchl if the channel synchronization record is corrupted. If the problem affects the channels on the SENDER side(e.g. SDR or CLUSSDR) channels then no message will be sent by the channels. The “DIS CHS” output likely to show no value in the SUBSTATE field.
AMQ8417I: Display Channel Status details.
CHANNEL(CLUSCHL1) CHLTYPE(CLUSSDR)
…
RQMNAME(RQM1) STATUS(RUNNING)
SUBSTATE( )
XMITQ(SYSTEM.CLUSTER.TRANSMIT.CLUSCHL1)
If the affected channels are on the receiver side (e.g. RCVR or CLUSRCVR) then the channel process on the receiver side consumes high CPU with the corresponding SDR or RCVR channel going into retrying state.
The top output for the affect channel process shows high CPU usage.
PID USER PR NI VIRT RES SHR S %CPU %MEM
TIME+ COMMAND
133101 mqm 20 0 265412 13836 11584 R 106.2 0.4
2:08.97 runmqchl
133101 mqm 20 0 265412 13836 11584 R 99.7 0.4
2:11.97 runmqchl
133101 mqm 20 0 265412 13836 11584 R 99.3 0.4
2:14.97 runmqchl
133101 mqm 20 0 265412 13836 11584 R 99.7 0.4
2:17.97 runmqchl