Bug#615492: mumble-server: Users connected to server cannot hear each other

[Simon Heath]

Package: mumble-server
Version: 1.2.2-6
Severity: important

Multiple people connecting to the Mumble server can occasionally not
communicate.  Sometimes person A cannot hear person B but B can hear A,
sometimes neither of them can hear each other.  If A, B, C and D are connected
it often happens that B and C cannot communicate with each other but both can
talk to and be heard by A and D, or everyone can hear A but A only hears B and
C.  It can happen more or less at random as far as I can tell; you can have
four people in the server who can all intercommunicate, and then suddenly one
of them cannot hear another while the other two appear unaffected.  Sometimes
disconnecting and reconnecting to the server fixes this problem, sometimes it
does not.  Sometimes new people connecting are not able to be heard by people
already there.
This also appears to affect the user list in the client.  A, B and C will be
connected to the server, D will join, and only A and B will have their user
list updated while C does not see and cannot hear D.
This happens at random as far as I can tell, but if you have four people using
the software for more than ten minutes, you'll probably see it happen.  No
unusual notifications appear in the application or system logs; the server
application log notes people connecting and disconnecting with 100% accuracy.
All clients are using version 1.2.2 of the client.  Some are using the windows
client, some are using the Debian Linux client version 1.2.2-5.  It doesn't
appear to affect who can hear who.
This does not appear to affect the AMD64 version of the software; I tried with
an AMD64 machine on the same network given the same IP address and everything
worked fine.  This occurs even between two people on the same LAN.  Setting
the firewall of the mumble server system to accept everything from everywhere
does not appear to affect this problem.


-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: armel (armv5tel)

Kernel: Linux 2.6.35.7 (PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages mumble-server depends on:
ii  adduser                       3.112+nmu2 add and remove users and groups
ii  dbus                          1.4.1-2    simple interprocess messaging syst
ii  debconf [debconf-2.0]         1.5.38     Debian configuration management sy
ii  libavahi-client3              0.6.28-3   Avahi client library
ii  libavahi-common3              0.6.28-3   Avahi common library
ii  libavahi-compat-libdnssd1     0.6.28-3   Avahi Apple Bonjour compatibility 
ii  libc6                         2.11.2-11  Embedded GNU C Library: Shared lib
ii  libcap2                       1:2.20-1   support for getting/setting POSIX.
ii  libgcc1                       1:4.4.5-12 GCC support library
ii  libiceutil33                  3.3.1-12   Ice for C++ misc utility library
ii  libprotobuf6                  2.3.0-4    protocol buffers C++ library
ii  libqt4-dbus                   4:4.6.3-4  Qt 4 D-Bus module
ii  libqt4-network                4:4.6.3-4  Qt 4 network module
ii  libqt4-sql                    4:4.6.3-4  Qt 4 SQL module
ii  libqt4-sql-sqlite             4:4.6.3-4  Qt 4 SQLite 3 database driver
ii  libqt4-xml                    4:4.6.3-4  Qt 4 XML module
ii  libqtcore4                    4:4.6.3-4  Qt 4 core module
ii  libssl0.9.8                   0.9.8o-5   SSL shared libraries
ii  libstdc++6                    4.4.5-12   The GNU Standard C++ Library v3
ii  libzeroc-ice33                3.3.1-12   Ice for C++ runtime library

mumble-server recommends no packages.

Versions of packages mumble-server suggests:
pn  mumble-django                 <none>     (no description available)
pn  mumble-server-web             <none>     (no description available)

-- Configuration Files:
/etc/mumble-server.ini [Errno 13] Permission denied: u'/etc/mumble-server.ini'

-- debconf information excluded