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Re: [resent] virt-manager connection fails with 'qemu unexpectedly closed the monitor'

On 12/20/20 6:53 AM, John Paul Adrian Glaubitz wrote:

I recently ran into a problem when connecting to libvirtd 6.9.0 on Debian unstable
and trying to import an existing image with Windows 7.

Upon finishing the wizard and starting the instance, the import process fails
with the following error message:

Unable to complete install: 'internal error: qemu unexpectedly closed the monitor'

Traceback (most recent call last):
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in cb_wrapper
     callback(asyncjob, *args, **kwargs)
   File "/usr/share/virt-manager/virtManager/createvm.py", line 2081, in _do_async_install
     installer.start_install(guest, meter=meter)
   File "/usr/share/virt-manager/virtinst/install/installer.py", line 731, in start_install
     domain = self._create_guest(
   File "/usr/share/virt-manager/virtinst/install/installer.py", line 679, in _create_guest
     domain = self.conn.createXML(install_xml or final_xml, 0)
   File "/usr/lib64/python3.8/site-packages/libvirt.py", line 4366, in createXML
     raise libvirtError('virDomainCreateXML() failed')
libvirt.libvirtError: internal error: qemu unexpectedly closed the monitor

Since this error message is rather generic, I don't know where to start debugging.

Does anyone know how to increase verbosity here to get an error message that might be
more helpful?

The first step would be to look in /var/log/libvirt/qemu/$guestname.log. If qemu is encountering some error, it should be logging a message there before it exits. (unless the error is a segfault; in that case I guess you'll need to look for a coredump. It will also list exactly the qemu commandline that was used. If the message there isn't illuminating enough and you come back here, it would be helpful to "bring along" that qemu commandline (and any accompanying error) as well as the output of "virsh dumpxml $guestname"

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