[Pkg-libvirt-maintainers] Bug#863266: libvirt-daemon: spice port conflict - multiple VMs want Port 5900

[Marc Haber]

Package: libvirt-daemon
Version: 3.0.0-4
Severity: normal

Dear Maintainer,

somewhere in mid-may, libvirt broke in regard to autoport and SPICE in
sid. On my systems, I cannot start more than a single VM any more;
libvirt complains that Port 5900 is already in use:

[3/6034]mh at swivel:~ $ virsh start test01
error: Failed to start domain test01
error: internal error: process exited while connecting to monitor: ((null):9786): Spice-Warning **: reds.c:2499:reds_init_socket: listen: Address already in use
2017-05-24T14:26:01.824277Z qemu-system-x86_64: failed to initialize spice server

This affects both newly defined domains and older domains as well,
including domains that used to happily run concurrently before may.
There is a number of reports regarding this out on the net, mostly from
Red Hat users, but Red Hat is on a fairly more recent version of libvirt
than we are. Also, those bug reports all do suggest that this is a race
condition when domains get started quickly after each other, but I am
also seeing this when starting the second domain minutes after the first
one was started, the system has settled down and a qemu process with
"-spice port=5900,addr=127.0.0.1,disable-ticketing,image-compression=off,seamless-migration=on"
has become visible in the process list.

I doubt that this issue is actually caused by libvirt itself. The last
libvirt update was back in March, and I upgrade my sid about twice a
month, and the breakage is fairly recent. I do create my domains with
virt-manager's help, but virt-manager also hasn't been updated recently.

Here is the tail of which-pkg-broke libvirt-daemon:

enstore3.0:amd64                                   Thu May  4 20:09:36 2017
libxen-4.8:amd64                                       Thu May  4 20:09:37 2017
libudev1:amd64                                         Sat May 13 09:35:52 2017
libsystemd0:amd64                                      Sat May 13 09:35:54 2017
librbd1                                                Sat May 13 09:37:38 2017
librados2                                              Sat May 13 09:37:38 2017
dpkg                                                   Mon May 22 06:30:16 2017
gcc-6-base:amd64                                       Mon May 22 06:30:18 2017
libstdc++6:amd64                                       Mon May 22 06:30:19 2017
libgcc1:amd64                                          Mon May 22 06:30:43 2017
debconf                                                Mon May 22 06:30:56 2017

New domains get created with

    <graphics type='spice' autoport='yes'>
      <listen type='address'/>
      <image compression='off'/>
    </graphics>

which mutates on a running domain to

    <graphics type='spice' port='5900' autoport='yes' listen='127.0.0.1'>
      <listen type='address' address='127.0.0.1'/>
      <image compression='off'/>
    </graphics>

Changing the XML on the second domain to

    <graphics type='spice' port='5933' autoport='no'>
      <listen type='address'/>
      <image compression='off'/>
    </graphics>

allows me to happily start the second domain, but this of course does
not scale at all.

If there is anything I can help to debug, please let me know.#

Greetings
Marc


-- System Information:
Debian Release: 9.0
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64
 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.11.2-zgws1 (SMP w/4 CPU cores)
Locale: LANG=en_DK.utf8, LC_CTYPE=en_DK.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages libvirt-daemon depends on:
ii  libapparmor1        2.11.0-3
ii  libaudit1           1:2.6.7-2
ii  libavahi-client3    0.6.32-2
ii  libavahi-common3    0.6.32-2
ii  libblkid1           2.29.2-1
ii  libc6               2.24-10
ii  libcap-ng0          0.7.7-3+b1
ii  libdbus-1-3         1.10.18-1
ii  libdevmapper1.02.1  2:1.02.137-2
ii  libfuse2            2.9.7-1
ii  libgnutls30         3.5.8-5
ii  libnetcf1           1:0.2.8-1+b2
ii  libnl-3-200         3.2.27-2
ii  libnl-route-3-200   3.2.27-2
ii  libnuma1            2.0.11-2.1
ii  libparted2          3.2-17
ii  libpcap0.8          1.8.1-3
ii  libpciaccess0       0.13.4-1+b2
ii  librados2           10.2.5-7
ii  librbd1             10.2.5-7
ii  libsasl2-2          2.1.27~101-g0780600+dfsg-3
ii  libselinux1         2.6-3+b1
ii  libssh2-1           1.8.0-1
ii  libudev1            232-23
ii  libvirt0            3.0.0-4
ii  libxen-4.8          4.8.1-1+deb9u1
ii  libxenstore3.0      4.8.1-1+deb9u1
ii  libxml2             2.9.4+dfsg1-2.2
ii  libyajl2            2.1.0-2+b3

Versions of packages libvirt-daemon recommends:
ii  libxml2-utils   2.9.4+dfsg1-2.2
ii  netcat-openbsd  1.130-3
ii  qemu-kvm        1:2.8+dfsg-5

Versions of packages libvirt-daemon suggests:
ii  libvirt-daemon-system  3.0.0-4
pn  numad                  <none>

-- no debconf information