[libvirt-users] libvirtd not accepting connections

[Michael C Cambria]

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.


>> 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]