Connectrix: Pmon Service Results in Disruptive Reload When Running `show tech` Commands

Summary: Pmon service results in disruptive reload while running `show tech` commands.

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Symptoms

The pmon service crashes and restarts while running the show port-monitor internal event-history debug command.

This has been seen on the NX-OS 9.4.1 code family.

This command is part of the following commands, and so they can trigger this issue:

show tech-support show tech-support details show tech-support fpm

The following syslog is logged to show the logging logfile:

%SYSMGR-3-HEARTBEAT_FAILURE: Service "PMon" sent SIGABRT for not setting heartbeat for last 4 period
s. Last heartbeat 46.91 secs ago.
%SYSMGR-2-SERVICE_CRASHED: Service "PMon" (PID ...) hasn't caught signal 6 (core will be saved).

This issue applies to all MDS platforms. At least one Port Monitor policy must be active and applied to at least one interface.

Cause

Cisco issue CSCwh76823 This hyperlink is taking you to a website outside of Dell Technologies.

This issue applies to all MDS platforms.

At least one Port Monitor policy must be active and applied to at least one interface. This issue occurs if there are excessive delays in collecting the internal Port Monitor debug log from a module.

Resolution

Fix:
Upgrade to a version later than 9.4.1a

Workaround:
Do not run the following commands:

show tech-support

show tech-support details

show tech-support fpm

show port-monitor internal event-history debug

Affected Products

Connectrix MDS-Series Hardware
Article Properties
Article Number: 000328074
Article Type: Solution
Last Modified: 04 Jun 2025
Version:  1
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