IBM Support

Using sigdump to generate IBM MQ diagnostic FFSTs on Linux and UNIX

Technote (troubleshooting)


You need to generate diagnostic FDC files from your queue managers in order to help diagnose an IBM MQ problem.

Resolving the problem

The sigdump script provides an easy way to generate diagnostic FDC files from WebSphere MQ queue manager processes on AIX, HP-UX, Linux and Solaris systems.

Using sigdump

In order to use sigdump, you must first download the script to your system and make it executable, for example by running: chmod a+x sigdump


    sigdump -?

    sigdump {-m Qmgr | -p Pid}...

    -m Qmgr

      This option allows you to generate diagnostic FDCs for all processes which are part of a queue manager. You can repeat this option to generate FDCs for multiple queue managers.

    -p Pid
      This option allows you to request a diagnostic FDC from a specific WebSphere MQ process identifier (pid). You can repeat this option to generate FDCs for multiple processes.


    Example 1

    Read detailed help for sigdump:

    sh> sigdump -?

    Example 2

    Generate diagnostic FDCs for queue manager TEST.QMGR:

    sh> sigdump -m TEST.QMGR

    Example 3

    Generate diagnostic FDCs for processes 29723 and 1027815:

    sh> sigdump -p 29723 -p 1027815

    Example 4

    Generate diagnostic FDCs for process 4401925 and for DEV.QMGR and PROD.QMGR:

    sh> sigdump -p 4401925 -m DEV.QMGR -m PROD.QMGR

Usage Notes

The sigdump script works by sending signal SIGUSR2 to WebSphere MQ processes in order to request a diagnostic FDC. Programs which are not specifically written to handle SIGUSR2 will terminate, so the sigdump script contains checks to ensure that it signals only capable WebSphere MQ processes.

You must have authority to signal a process for sigdump to succeed. In the case of WebSphere MQ, you must run sigdump the user who started the queue manager, or as mqm (in most cases), or as root. If sigdump lacks the authority to signal a queue manager or process, it will tell you which user can do so.

The diagnostic FDC files generated by sigdump can be identified by the Probe Id values they contain. The Probe Id for a diagnostic FDC entry always ends in 255, as shown below. Note that a single FDC file may contain multiple entries, with the most recent ones at the end of the file:

    |                                                                     |
    | WebSphere MQ First Failure Symptom Report                           |
    | =========================================                           |
    |                                                                     |
    | Date/Time         :- Mon July 16 2012 20:46:37 EST                  |
    | Operating System  :- AIX 7.1                                        |
    | Product Long Name :- WebSphere MQ for AIX                           |
    | Probe Id          :- XC332255                                       |
    | Component         :- xlsWaitEvent                                   |
    | Program Name      :- amqzlaa0                                       |
    | Process           :- 13500650                                       |
    | Thread            :- 1                                              |
    | QueueManager      :- TEST.QMGR                                      |
    | Major Errorcode   :- OK                                             |
    | Minor Errorcode   :- OK                                             |
    | Probe Type        :- INCORROUT                                      |
    | Probe Severity    :- 4                                              |
    | Probe Description :- AMQ6109: An internal WebSphere MQ error has    |
    |                      occurred.                                      |
    |                                                                     |

Sample Output

The sigdump script prints a summary of the processes it signals and the FDC files they create. You can send this summary to IBM, but you must include all of the named FDC files (or better yet, all of the FDC files in the /var/mqm/errors directory). For example:

    sh> sigdump -m TEST.QMGR -p 26280068 -p 21495896
    sigdump: V3.1 running on AIX 7.1 (powerpc) with arguments: -m TEST.QMGR
             -p 26280068 -p 21495896
    sigdump: Creating diagnostic FDCs for queue manager PURCELL:
    sigdump:   AMQ13500650.0.FDC - amqpcsea: Command server
    sigdump:   AMQ24510692.0.FDC - amqzmuf0: Publish/subscribe utilities
    sigdump:   AMQ28835860.0.FDC - amqzdmaa: Deferred message processor
    sigdump:   AMQ29098188.0.FDC - amqfqpub: Publish/subscribe controller
    sigdump:   AMQ29556844.0.FDC - amqzlaa0: Standard application agent
    sigdump:   AMQ28096363.0.FDC - amqzlaa0: Standard application agent
    sigdump:   AMQ30277658.0.FDC - runmqchi: Channel initiator
    sigdump:   AMQ30605420.0.FDC - amqrrmfa: Cluster repository manager
    sigdump:   AMQ30998624.0.FDC - amqzfuma: Object authority manager
    sigdump:   AMQ31391790.0.FDC - amqzxma0: Execution controller
    sigdump:   AMQ31850682.0.FDC - amqzmgr0: Process controller
    sigdump:   AMQ31916042.0.FDC - amqzmur0: Recoverable utilities
    sigdump:   AMQ32112814.0.FDC - amqfcxba: Publish/subscribe worker
    sigdump:   AMQ32178294.0.FDC - amqzmuc0: Critical utilities
    sigdump: Creating diagnostic FDCs for processes:
    sigdump:   AMQ26280068.0.FDC - runmqlsr: Network listener
    sigdump:   AMQ21495896.0.FDC - dspmqspl: Display security policy
    sigdump: Created 16 diagnostic FDC files in the /var/mqm/errors
             directory.  Please send these files to IBM for review.

DISCLAIMER: All source code and/or binaries attached to this document are referred to here as "the Program". IBM is not providing program services of any kind for the Program. IBM is providing the Program on an "AS IS" basis without warranty of any kind. IBM WILL NOT BE LIABLE FOR ANY ACTUAL, DIRECT, SPECIAL, INCIDENTAL, OR INDIRECT DAMAGES OR FOR ANY ECONOMIC CONSEQUENTIAL DAMAGES (INCLUDING LOST PROFITS OR SAVINGS), EVEN IF IBM, OR ITS RESELLER, HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Cross reference information
Segment Product Component Platform Version Edition
Business Integration IBM MQ Problem Determination AIX, HP-UX, Linux, Solaris 9.0, 8.0, 7.5, 7.1, 7.0

Product Alias/Synonym


Document information

More support for: WebSphere MQ
Problem Determination

Software version: 7.0, 7.1, 7.5, 8.0, 9.0

Operating system(s): AIX, HP-UX, Linux, Solaris

Software edition: All Editions

Reference #: 1329744

Modified date: 19 October 2017

Translate this page: