This KB describes the details of the libvirtMib_suba core seen with QFX5120 switch during upgrade

The customer has upgraded one of their QFX5120-32C from 20.4R3-S3.4 to 20.4R3-S5.4 version and observed libvirtMib_suba core after the upgrade which is similar to the known public PR1419536.

The both from and to versions are having fix of this PR.

Core:

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rw-r--r-- 1 root root   147456 Apr 13 23:45 /var/crash/node.libvirtMib_suba.2774.1681429555.core.gz

-rw-r--r-- 1 root root    1287 Apr 13 23:45 /var/crash/node.libvirtMib_suba.2774.1681429555.core.info

libvirtMib_suba core might be observed during installation of images. There is no functional impact due to this core, since this core happens in the libvirtMib_subagent. And the fix of the PR is on the SDK, the customer upgraded from old version [which does not have fix of this PR] without force-host option, also did not use force-host for recent upgrades as well so the core was seen.

The solution is to use force-host option when upgrading the node -> [request system software add /var/tmp/<image> force-host]

2023-07-12: Initial Version