// Module included in the following assemblies:
//
// * hardware_enablement/kmm-kernel-module-management.adoc

:_mod-docs-content-type: CONCEPT
[id="kmm-debugging-and-troubleshooting_{context}"]
= Debugging and troubleshooting

[role="_abstract"]
Unsigned or incorrectly signed kmods in KMM driver containers on {product-title} can cause `PostStartHookError` or `CrashLoopBackOff` states.
You can verify signing issues by running `oc describe` on the container and checking for a `Required key not available` error.

The following message appears in this scenario:

[source,terminal]
----
modprobe: ERROR: could not insert '<your_kmod_name>': Required key not available
----
