[libvirt-users] libvirtd not accepting connections

[Martin Kletzander]

On Sat, Jun 03, 2017 at 09:22:58AM -0400, Michael C Cambria wrote:
>
>
>On 06/02/2017 09:53 AM, Michael C. Cambria wrote:
>>
>>
>> On 06/02/2017 09:43 AM, Martin Kletzander wrote:
>>> [adding back the ML, you probably hit reply instead of reply-all, this
>>> way other people might help if they know more]
>>>
>>> On Fri, Jun 02, 2017 at 08:10:01AM -0400, Michael C. Cambria wrote:
>>>>
>>>> Hi,
>>>>
>>>> libvirtd never seems to get notified that there is work to do.
>>>> journalct
>>>> -f indicated that nothing was logged when connections were attempted
>>>> via
>>>> virsh.
>>>>
>>>> I also tried 'LIBVIRT_DEBUG=1 libvirtd --verbose' and once startup
>>>> finished, there were no more log entries even though virsh attempts
>>>> were
>>>> made.
>>>>
>>>
>>> That's because it gets overridden by the configuration files. This
>>> might be a bug, but it's not related to what's happening.
>>>
>>>> "ps ax" shows about a dozen "qemu-system-alpha" processes.  I don't
>>>> know
>>>> if it matters but I didn't expect to see this.  I didn't intentionally
>>>> configure alpha emulations (assuming that's what it is) and certainly
>>>> don't want to waste resources having it running.
>>>>
>>>
>>> Libvirt caches the capabilities of the emulators it can find in your
>>> system in order not to waste resources.  These processes are expected to
>>> go away after they reply with all libvirt asks them for. However, it
>>> seems like the initialization cannot be completed precisely due to the
>>> fact that these processes don't communicate.
>>>
>>> There might be some details about qemu-system-alpha that are different
>>> when compared to, e.g. qemu-system-x86 and libvirt is not (yet) adapted
>>> to them, but I installed that emulator and libvirt daemon runs as
>>> usual.  It looks like a problem in QEMU.  Could you, as a workaround,
>>> try uninstalling that qemu binary from your system and restarting the
>>> service?
>>>
>
>With qemu-system-alpha gone, I  now see qemu-system-arm.  With all
>qemu-system-* removed (using dnf remove) and stopping, then starting
>libvirtd, I still see qemu-system-arm even though the executable doesn't
>exist:
>
># ls -al /usr/bin | grep qemu-system
>-rwxr-xr-x.   1 root root     9993416 Apr 13 21:10 qemu-system-i386
>-rwxr-xr-x.   1 root root    10036032 Apr 13 21:10 qemu-system-x86_64
># systemctl status libvirtd.service
>● libvirtd.service - Virtualization daemon
>    Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled;
>vendor preset: enabled)
>    Active: active (running) since Sat 2017-06-03 09:12:19 EDT; 8min ago
>      Docs: man:libvirtd(8)
>            http://libvirt.org
>  Main PID: 5965 (libvirtd)
>     Tasks: 23 (limit: 4915)
>    Memory: 128.2M
>       CPU: 411ms
>    CGroup: /system.slice/libvirtd.service
>            ├─1537 /usr/bin/qemu-system-arm -S -no-user-config
>-nodefaults -nographic -M none -qmp
>unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,n
>            ├─1638 /usr/bin/qemu-system-arm -S -no-user-config
>-nodefaults -nographic -M none -qmp
>unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,n
>            ├─5965 /usr/sbin/libvirtd
>            ├─5999 /usr/bin/qemu-system-i386 -S -no-user-config
>-nodefaults -nographic -M none -qmp
>unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,
>            └─6001 /usr/bin/qemu-system-i386 -S -no-user-config
>-nodefaults -nographic -M none -qmp
>unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,
>
>Jun 03 09:12:19 example.com systemd[1]: Starting Virtualization daemon...
>Jun 03 09:12:19 example.com systemd[1]: Started Virtualization daemon.
>

Those look like leftovers from the previous run.  I have no idea why
they keep running, probably the same bug why they are not responding.
Would you mind trying one more thing:  Stopping the service, killing all
these processes, and then starting it?  Let's leave the QEMU issue on a
side until we figure this out first, then we can focus on the second
issue.  I must say this is quite bizarre.

>
>>> Also, what versions of libvirt and qemu do you have installed?
>>
>> # LIBVIRT_DEBUG=1 libvirtd --verbose
>> 2017-06-02 00:16:30.317+0000: 18088: info : libvirt version: 2.2.1,
>> package: 1.fc25 (Fedora Project, 2017-05-10-22:06:21,
>> buildvm-29.phx2.fedoraproject.org)
>>
>> I'll check on qemu as soon as I can get to the machine.  The version
>> should be the latest one gets via 'dnf update' on fedora 25
>
>
># /usr/sbin/libvirtd --version
>/usr/sbin/libvirtd (libvirt) 2.2.1
># qemu-x86_64 --version
>qemu-x86_64 version 2.7.1(qemu-2.7.1-6.fc25), Copyright (c) 2003-2016
>Fabrice Bellard and the QEMU Project developers
>
>[ gdb output deleted]
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