Triggering a checkpoint from inside the VM

[Daniel P. Berrangé]

On Thu, Sep 09, 2021 at 12:30:53AM +0000, Leek, Jim wrote:
> Here's the error I sometimes get on checkpoint/restore.  It just happened again.  In this test I had at least a 40 second break between checkpoint and restore, so extra sleep doesn't seem to help much.
> 
> Error unpausing domain: Timed out during operation: cannot acquire state change lock (held by monitor=qemuDispatchDomainMonitorCommand)
> 
> Traceback (most recent call last):
>   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper
>     callback(asyncjob, *args, **kwargs)
>   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb
>     callback(*args, **kwargs)
>   File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 66, in newfn
>     ret = fn(self, *args, **kwargs)
>   File "/usr/share/virt-manager/virtManager/object/domain.py", line 1312, in resume
>     self._backend.resume()
>   File "/usr/lib64/python3.6/site-packages/libvirt.py", line 2174, in resume
>     if ret == -1: raise libvirtError ('virDomainResume() failed', dom=self)
> libvirt.libvirtError: Timed out during operation: cannot acquire state change lock (held by monitor=qemuDispatchDomainMonitorCommand)

This suggests that the previously executed 'qemu-montor-command' has not
finished running yet.

Regards,
Daniel
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