[Xen-users] Host freezing after "fixing" recursive fault starting in multicalls.c

[<Peter.Kurfer@xxxxxxxx>]

Hi,

I'm running Xen 4.11.2 on Fedora 30 with Kernel versions 5.4.7 and 5.4.10 on 
multiple HP servers.

The workflow I'm trying to achieve looks like the following:

- a VM is resumed from a snapshot with a Python script using the libvirt API
- it is running for a few minutes,
- it gets paused and finally destroyed for testing purposes

At some point - it doesn't seem to be deterministic because sometimes it 
happens directly after the boot and sometimes after multiple hours - a huge 
stacktrace starting with an error in `arch/x86/xen/multicalls.c` can be found 
in the kernel logs which ends with the message 'Fixing recursive fault but 
reboot is needed!'.

After some time the system completely freezes and needs to be hard resetted 
because it is not possible any more to login via SSH.
The freeze is also not deterministic but there are no other critical errors in 
the logs, so it seems somehow to be related.

Because the full stacktrace has round about 370 lines I attached it as a GitHub 
Gist:

https://gist.github.com/baez90/135c3985cbb6fd4b4204269fb384221a

I'm a little confused as to what else to try and I have no idea what the 
problem might be.

Any hints/ideas/proposals?

Kind regards and thanks in advance
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