[libvirt-users] libvirtd not starting

[Martin Kletzander]

On Thu, May 02, 2019 at 02:25:28PM +0200, Martin Kletzander wrote:
>On Thu, May 02, 2019 at 01:07:32PM +0200, Michal Privoznik wrote:
>>On 5/2/19 12:08 PM, Lothar Schilling wrote:
>>
>>> I turned logging up to maximum. That's all I get:
>>>
>>> May  2 11:02:06 hl308-3 systemd: Starting Virtualization daemon...
>>> May  2 11:02:06 hl308-3 libvirtd: 472: info : libvirt version: 4.5.0, package: 10.el7_6.7 (CentOS BuildSystem <http://bugs.centos.org>, 2019-04-24-14:04:12, x86-01.bsys.centos.org)
>>> May  2 11:02:06 hl308-3 libvirtd: 472: info : hostname: my.server.net
>>> May  2 11:02:06 hl308-3 libvirtd: 472: info : virEventPollAddHandle:140 : EVENT_POLL_ADD_HANDLE: watch=1 fd=6 events=1 cb=0x7eff3bbde300 opaque=(nil) ff=(nil)
>>> May  2 11:02:06 hl308-3 libvirtd: 472: info : virEventPollAddHandle:140 : EVENT_POLL_ADD_HANDLE: watch=2 fd=8 events=1 cb=0x7eff3bd06760 opaque=0x558f9db485a0 ff=(nil)
>>> May  2 11:02:06 hl308-3 systemd: Started Virtualization daemon.
>>> May  2 11:02:06 hl308-3 libvirtd: 472: info : virEventPollAddHandle:140 : EVENT_POLL_ADD_HANDLE: watch=3 fd=11 events=0 cb=0x7eff3bcfb420 opaque=0x558f9db69520 ff=0x7eff3bcfb3d0
>>> May  2 11:02:06 hl308-3 libvirtd: 472: info : virEventPollAddHandle:140 : EVENT_POLL_ADD_HANDLE: watch=4 fd=12 events=0 cb=0x7eff3bcfb420 opaque=0x558f9db69700 ff=0x7eff3bcfb3d0
>>> May  2 11:02:06 hl308-3 libvirtd: process 472: arguments to dbus_message_iter_append_basic() were incorrect, assertion "_dbus_check_is_valid_utf8 (*string_p)" failed in file ../../dbus/dbus-message.c line 2754.
>>> May  2 11:02:06 hl308-3 libvirtd: This is normally a bug in some application using the D-Bus library.
>>> May  2 11:02:06 hl308-3 libvirtd: D-Bus not built with -rdynamic so unable to print a backtrace
>>> May  2 11:02:06 hl308-3 systemd: libvirtd.service: main process exited, code=killed, status=6/ABRT
>>
>>This is not the maximum loggin. We'll need to see debug logs:
>>
>>https://wiki.libvirt.org/page/DebugLogs
>>
>>and perhaps running libvirtd under gdb and getting a stack trace (with
>>all strings expanded) might help too.
>>
>
>Actually gdb might be the only help here.  The reason is that that dbus call
>just reports the error and then calls abort(), so libvirtd will not even get an
>error message (which would help us track down what might've been the case).
>
>If you can do something like:
>

Even better, there are some ways to get the core dump information which I
completely forgot about:

 - coredumpctl -- IIRC you are running CentOS 7, so this will not be available
                  for you yet.  If it was, coredumpctl show just shows all we
                  need (by default it picks the last core dump and stacktrace is
                  part of the output).

 - abrt-cli -- Similar to the above, it should be available for you, but you
               need to have abrt installed and setup.  Which is not always the
               default.  If you do, or you set it up yourself, however, you
               should be able to get to the core dump as well, but it is not as
               easy as with coredumpctl (i.e. I did not get to it in first 10
               seconds).

 - Setup your own -- either set the ulimit for the service and look for the file
                     that gets created or set kernel.core_pattern using sysctl
                     to a command that gets ran with each core dump (this one
                     does not need any ulimit setting, but you need to know what
                     to specify there.

Please let us know if you got anywhere, I'd like to see what the issue is and
how we can fix it.

>  $ dnf --enablerepo='*debug*' install libvirt-debuginfo dbus-debuginfo
>
>  $ cat >/var/lib/libvirt/gdbabortscript <<EOF
>  start
>  break abort
>  commands
>  t a a bt full
>  end
>  continue
>  EOF
>
>  $ cat >/etc/systemd/system/libvirtd.service.d/override.conf <<EOF
>  [Service]
>  ExecStart=
>  ExecStart=gdb --batch -x /var/lib/libvirt/gdbabortscript /usr/sbin/libvirtd $LIBVIRTD_ARGS
>  EOF
>
>  $ systemctl daemon-reload
>  $ restorecon -F /var/lib/libvirt/gdbabortscript /etc/systemd/system/libvirtd.service.d/override.conf
>  $ systemctl restart libvirtd.service
>
>You should get the full stacktrace of the issue in the output of:
>
>  journalctl -u libvirtd.service
>
>and you can post it here so we can find out what's happening.
>
>HTH,
>Martin



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