Also in my setup I see several kernel NULL pointer followed by a system crash and a reboot after several days. in log files (kern.log) there is a hole from several hours before the crash.
XCP-ng 8.2
CPU AMD EPYC Milan
SMB ISO mounted on a self hosted VM based on windows 2019.
Several error relater to this storage repository also in not used (no anymore ISO inside, and so no link on virtual DVD drive active).
Now I delete this SMB ISO repo looking forward to see if the problem it's solved or not.... quite impressed for the chance to create a server crash with a similar bug...