pulseaudio crashed with SIGSEGV in pa_asyncmsgq_flush()

[braykov]

It says this bug is fix but it is not, so I am reporting it again.
Obviously the loop-back module is broken.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu12
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: fglrx
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/2
   Subdevice #0: subdevice #0
   Subdevice #1: subdevice #1
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebdc000 irq 47'
   Mixer name : 'IDT 92HD73D1X5'
   Components : 'HDA:111d7674,102802ae,00100202'
   Controls : 41
   Simple ctrls : 22
Card1.Amixer.info:
 Card hw:1 'Generic'/'HD-Audio Generic at 0xfe9dc000 irq 48'
   Mixer name : 'ATI R6xx HDMI'
   Components : 'HDA:1002aa01,00aa0100,00100200'
   Controls : 6
   Simple ctrls : 1
Card1.Amixer.values:
 Simple mixer control 'IEC958',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [on]
CrashCounter: 1
Date: Mon Mar 19 08:14:27 2012
ExecutablePath: /usr/bin/pulseaudio
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120201.1)
ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
ProcEnviron:
 SHELL=/bin/false
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
SegvAnalysis:
 Segfault happened at: 0x7f5091fafdb7: mov 0x60(%rax),%rax
 PC (0x7f5091fafdb7) ok
 source "0x60(%rax)" (0x00000060) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: pulseaudio
StacktraceTop:
 ?? () from /usr/lib/pulse-1.1/modules/module-loopback.so
 ?? () from /usr/lib/pulse-1.1/modules/module-loopback.so
 pa_asyncmsgq_flush () from /usr/lib/libpulsecore-1.1.so
 pa_thread_mq_done () from /usr/lib/libpulsecore-1.1.so
 module_null_sink_LTX_pa__done () from /usr/lib/pulse-1.1/modules/module-null-sink.so
Title: pulseaudio crashed with SIGSEGV in pa_asyncmsgq_flush()
UpgradeStatus: Upgraded to precise on 2012-03-12 (6 days ago)
UserGroups:

dmi.bios.date: 02/20/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A01
dmi.board.name: 0G254H
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA01:bd02/20/2009:svnDellInc.:pnDellXPS430:pvr:rvnDellInc.:rn0G254H:rvrA00:cvnDellInc.:ct7:cvr:
dmi.product.name: Dell XPS430
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.pulse.default.pa: [modified]
mtime.conffile..etc.pulse.default.pa: 2012-03-14T00:10:34.235885

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #946400, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.