I'll dig into this tomorrow.

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  pulseaudio assert failure: pulseaudio: mixer.c:929:
  snd_mixer_elem_get_callback_private: Assertion `mixer' failed.

Status in PulseAudio:
  Fix Released
Status in pulseaudio package in Ubuntu:
  Fix Released
Status in pulseaudio source package in Bionic:
  Fix Committed
Status in pulseaudio source package in Cosmic:
  Fix Released
Status in pulseaudio source package in Disco:
  Fix Released
Status in pulseaudio source package in Eoan:
  Fix Released

Bug description:


  This is one of the top pulseaudio crashes in Ubuntu 18.04 according to:

  [Test Case]

  No manual test case known. Just watch errors.ubuntu.com to check for

  [Regression Potential]

  Low. The fix is already in PulseAudio 12 so has been used in Ubuntu
  18.10 and later for a year so far.

  [Other Info]

  SRU sponsorship tracked in bug 1556439.

  [Original Report]

  Sidenote: Imediatly got that crash after the apt-xapian-index one (
  lp:1663524 ); does not know if it can exist a possible relationship
  between them.

  Got an other crash, and that time 'sound' is fully lost (pulseaudio
  not reloaded). Wonder if lp:1662860 can be concerned.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.04
  Package: pulseaudio 1:10.0-1ubuntu1
  ProcVersionSignature: Ubuntu 4.9.0-16.17-generic 4.9.6
  Uname: Linux 4.9.0-16-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  AssertionMessage: pulseaudio: mixer.c:929: 
snd_mixer_elem_get_callback_private: Assertion `mixer' failed.
   /dev/snd/controlC1:  oem        4084 F.... pulseaudio
   /dev/snd/controlC0:  oem        4084 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Fri Feb 10 09:55:45 2017
  ExecutablePath: /usr/bin/pulseaudio
  ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
   PATH=(custom, no user)
  Signal: 6
  SourcePackage: pulseaudio
   __assert_fail_base (fmt=<optimised out>, 
assertion=assertion@entry=0x7f92818e7188 "mixer", 
file=file@entry=0x7f92818e7419 "mixer.c", line=line@entry=929, 
function=function@entry=0x7f92818e76a0 "snd_mixer_elem_get_callback_private") 
at assert.c:92
   __GI___assert_fail (assertion=0x7f92818e7188 "mixer", file=0x7f92818e7419 
"mixer.c", line=929, function=0x7f92818e76a0 
"snd_mixer_elem_get_callback_private") at assert.c:101
   snd_mixer_elem_get_callback_private () from 
   ?? () from /usr/lib/pulse-10.0/modules/module-alsa-card.so
   ?? () from /usr/lib/pulse-10.0/modules/module-alsa-card.so
  Title: pulseaudio assert failure: pulseaudio: mixer.c:929: 
snd_mixer_elem_get_callback_private: Assertion `mixer' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom colord dip lpadmin nvidia-persistenced plugdev 
sambashare sudo users
  dmi.bios.date: 07/22/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3002
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P5W DH Deluxe
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.product.name: P5W DH Deluxe
  dmi.product.version: System Version
  dmi.sys.vendor: ASUSTEK COMPUTER INC

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