mumble crashes on startup when using jack sink

[Chris J Arges]

When launching mumble with jack sink as the audio output, mumble crashes immediately upon startup.
If I launch it from the console I see the following:

AudioInput: 40000 bits/s, 48000 hz, 480 sample CELT
PulseAudio: Starting input alsa_input.pci-0000_00_1b.0.analog-stereo
Assertion 's' failed at pulse/stream.c:2063, function pa_stream_set_state_callback(). Aborting.
Aborted (core dumped)

I've verified this failure with Precise using mumble 1.2.3-2ubuntu4.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: mumble 1.2.3-2ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux 3.2.0-27-generic x86_64
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
Date: Thu Aug 2 10:18:14 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64+mac (20120319)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: mumble
UpgradeStatus: No upgrade log present (probably fresh install)

[Chris J Arges (arges)]

Stacktrace:
 #0 0x00007f913cc0b445 in __GI_raise (sig=<optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
         resultvar = 0
         pid = <optimized out>
         selftid = 547
 #1 0x00007f913cc0ebab in __GI_abort () at abort.c:91
         save_stage = 2
         act = {__sigaction_handler = {sa_handler = 0x7f9100000000, sa_sigaction = 0x7f9100000000}, sa_mask = {__val = {7186360886695272448, 140261766052936, 140261847827680, 5991792, 46146688, 52932096, 52922464, 4294967295, 140261735547800, 0, 0, 2388080, 0, 52922464, 3, 140261811871744}}, sa_flags = 1098835828, sa_restorer = 0x5}
         sigs = {__val = {32, 0 <repeats 15 times>}}
 #2 0x00007f913f7bb16e in pa_stream_set_state_callback () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
 No symbol table info available.
 #3 0x00000000005b89e6 in ?? ()
 No symbol table info available.
 #4 0x00007f913f7afba7 in pa_mainloop_dispatch () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
 No symbol table info available.
 #5 0x00007f913f7afde5 in pa_mainloop_iterate () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
 No symbol table info available.
 #6 0x00007f913f7afe90 in pa_mainloop_run () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
 No symbol table info available.
 #7 0x00007f913f7be30f in ?? () from /usr/lib/x86_64-linux-gnu/libpulse.so.0
 No symbol table info available.
 #8 0x00007f913aedfd18 in ?? () from /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so
 No symbol table info available.
 #9 0x00007f913f36fe9a in start_thread (arg=0x7f911b104700) at pthread_create.c:308
         __res = <optimized out>
         pd = 0x7f911b104700
         now = <optimized out>
         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 6957379330033894113, 140261807593600, 140261201037760, 0, 3, -6940146514623675679, -6940067029813509407}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
         not_first_call = 0
         pagesize_m1 = <optimized out>
         sp = <optimized out>
         freesize = <optimized out>
         __PRETTY_FUNCTION__ = "start_thread"
 #10 0x00007f913ccc74bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
 No locals.
 #11 0x0000000000000000 in ?? ()