Proposed fix for xenial

** Description changed:

  https://errors.ubuntu.com/problem/49276ec9f717c5268dfc99940a28fb4a56fe1b4a
  
  ---
+ 
+ [Impact]
+ pulseaudio daemon crashes, interrupting sound output/input.
+ 
+ [Test Case]
+ Theoretical test case (crash does not happen for all users):
+ 1. Find some headphones and/or microphone. Ensure you do not wear the
+    headphones during the test as it may be loud.
+ 2. Set audio output/input volumes to maximum.
+ 3. Unplug and replug the headphones/microphone.
+ 4. Check that that pulseaudio process is still running, with a start time
+    older than when you began this test case.
+ 
+ Practical test case I am really relying on:
+ Patch the bug and wait weeks/months to ensure there are no more reported
+ crashes for it on errors.ubuntu.com
+ 
+ [Regression Potential]
+ Low. This SRU affects the pulseaudio daemon only so the worst case would be 
loss of sound output/input. The same patches have been released to
+ 17.10 for a month already and zero regressions of the crashes have
+ occurred worldwide since then.
+ 
+ [Original Description]
  
  Appears randomly.
  
  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: pulseaudio 1:7.1-1ubuntu3
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  ApportVersion: 2.19.4-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   potato    12883 F...m pulseaudio
   /dev/snd/controlC0:  potato    12883 F.... pulseaudio
   /dev/snd/controlC1:  potato    12883 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jan 28 22:16:03 2016
  ExecutablePath: /usr/bin/pulseaudio
  InstallationDate: Installed on 2016-01-17 (11 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
  ProcEnviron:
   PATH=(custom, no user)
   SHELL=/bin/bash
   LANG=ru_RU.UTF-8
   LANGUAGE=ru
   XDG_RUNTIME_DIR=<set>
  Signal: 6
  SourcePackage: pulseaudio
  StacktraceTop:
   pa_alsa_path_set_volume () from /usr/lib/pulse-7.1/modules/libalsa-util.so
   ?? () from /usr/lib/pulse-7.1/modules/libalsa-util.so
   pa_source_process_msg () from /usr/lib/libpulsecore-7.1.so
   ?? () from /usr/lib/pulse-7.1/modules/libalsa-util.so
   ?? () from /usr/lib/libpulsecore-7.1.so
  Title: pulseaudio crashed with SIGABRT in pa_alsa_path_set_volume()
  UpgradeStatus: Upgraded to xenial on 2016-01-28 (0 days ago)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 12/07/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.11
  dmi.board.name: JV71TR
  dmi.board.vendor: Acer
  dmi.board.version: Rev
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrV1.11:bd12/07/2009:svnAcer:pnAspire7540:pvr0100:rvnAcer:rnJV71TR:rvrRev:cvnAcer:ct10:cvrNone:
  dmi.product.name: Aspire 7540
  dmi.product.version: 0100
  dmi.sys.vendor: Acer
  modified.conffile..etc.pulse.daemon.conf: [modified]
  mtime.conffile..etc.pulse.daemon.conf: 2016-01-25T21:44:07.089113

** Description changed:

  https://errors.ubuntu.com/problem/49276ec9f717c5268dfc99940a28fb4a56fe1b4a
  
  ---
  
  [Impact]
  pulseaudio daemon crashes, interrupting sound output/input.
  
  [Test Case]
  Theoretical test case (crash does not happen for all users):
  1. Find some headphones and/or microphone. Ensure you do not wear the
-    headphones during the test as it may be loud.
+    headphones during the test as it may be loud.
  2. Set audio output/input volumes to maximum.
  3. Unplug and replug the headphones/microphone.
  4. Check that that pulseaudio process is still running, with a start time
-    older than when you began this test case.
- 
- Practical test case I am really relying on:
- Patch the bug and wait weeks/months to ensure there are no more reported
- crashes for it on errors.ubuntu.com
+    older than when you began this test case.
  
  [Regression Potential]
  Low. This SRU affects the pulseaudio daemon only so the worst case would be 
loss of sound output/input. The same patches have been released to
  17.10 for a month already and zero regressions of the crashes have
  occurred worldwide since then.
  
  [Original Description]
  
  Appears randomly.
  
  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: pulseaudio 1:7.1-1ubuntu3
  ProcVersionSignature: Ubuntu 4.3.0-7.18-generic 4.3.3
  Uname: Linux 4.3.0-7-generic x86_64
  ApportVersion: 2.19.4-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0p:   potato    12883 F...m pulseaudio
   /dev/snd/controlC0:  potato    12883 F.... pulseaudio
   /dev/snd/controlC1:  potato    12883 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jan 28 22:16:03 2016
  ExecutablePath: /usr/bin/pulseaudio
  InstallationDate: Installed on 2016-01-17 (11 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
  ProcEnviron:
   PATH=(custom, no user)
   SHELL=/bin/bash
   LANG=ru_RU.UTF-8
   LANGUAGE=ru
   XDG_RUNTIME_DIR=<set>
  Signal: 6
  SourcePackage: pulseaudio
  StacktraceTop:
   pa_alsa_path_set_volume () from /usr/lib/pulse-7.1/modules/libalsa-util.so
   ?? () from /usr/lib/pulse-7.1/modules/libalsa-util.so
   pa_source_process_msg () from /usr/lib/libpulsecore-7.1.so
   ?? () from /usr/lib/pulse-7.1/modules/libalsa-util.so
   ?? () from /usr/lib/libpulsecore-7.1.so
  Title: pulseaudio crashed with SIGABRT in pa_alsa_path_set_volume()
  UpgradeStatus: Upgraded to xenial on 2016-01-28 (0 days ago)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 12/07/2009
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.11
  dmi.board.name: JV71TR
  dmi.board.vendor: Acer
  dmi.board.version: Rev
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrV1.11:bd12/07/2009:svnAcer:pnAspire7540:pvr0100:rvnAcer:rnJV71TR:rvrRev:cvnAcer:ct10:cvrNone:
  dmi.product.name: Aspire 7540
  dmi.product.version: 0100
  dmi.sys.vendor: Acer
  modified.conffile..etc.pulse.daemon.conf: [modified]
  mtime.conffile..etc.pulse.daemon.conf: 2016-01-25T21:44:07.089113

** Patch added: "pulseaudio_8.0-0ubuntu3.4.debdiff"
   
https://bugs.launchpad.net/pulseaudio/+bug/1539209/+attachment/4930604/+files/pulseaudio_8.0-0ubuntu3.4.debdiff

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https://bugs.launchpad.net/bugs/1539209

Title:
  pulseaudio crashed with SIGABRT in pa_alsa_path_set_volume() from
  source_set_volume_cb() from pa_source_process_msg()

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