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[firefoxiscute <firefoxiscute@xxxxxxxx>]

Stephen, can you reproduce the bug with invoking something else than
getusermedia on firefox?

Please note, there exists a workaround:

mkdir libasound-manual
cd libasound-manual
apt-get source libasound2=1.0.27.2-1ubuntu6
cd alsa-lib-1.0.27.2/
make clean; ./gitcompile ; autoconf; ./configure; make;
sudo make install

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https://bugs.launchpad.net/bugs/1254562

Title:
  firefox gets 100% cpu and sometimes segfaults when using deb built
  package libasound2

Status in Ubuntu Desktop Version Tracker:
  New
Status in “alsa-lib” package in Ubuntu:
  New

Bug description:
  See firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=938361
  In the backtraces attached there you can see that libasound.so is causing the bug.

  It seems that the way libasound gets built determines the way firefox
  behaves: You get the error only when you use the automated method
  "apt-get source -b" for building libasound; If you build it manually,
  there is no error. See detailed instructions below.

  Steps to reproduce (1st way):
  See firefox bug.

  Steps to reproduce (2nd way):

  mkdir libasound-deb
  cd libasound-deb
  apt-get source -b libasound2=1.0.27.2-1ubuntu6
  ar p libasound2_1.0.27.2-1ubuntu6_amd64.deb data.tar.gz | tar -xzf -
  LD_PRELOAD=`pwd`/usr/lib/x86_64-linux-gnu/libasound.so.2.0.0 firefox http://mozilla.github.io/webrtc-landing/gum_test.html & lsof | grep $! | grep libasound.so
  # Now click on "Video", "Audio" or "Video & Audio", it doesn't matter!
  # see cpu at constant 100%
  sleep 30
  kill $!

  However, the bug can't be reproduced with the following steps.
  Steps to NOT reproduce:

  mkdir libasound-manual
  cd libasound-manual
  apt-get source libasound2=1.0.27.2-1ubuntu6
  cd alsa-lib-1.0.27.2/
  make clean; ./gitcompile ; autoconf; ./configure --prefix=`pwd`/../; make; make install
  LD_PRELOAD=`pwd`/../lib/libasound.so.2.0.0 firefox http://mozilla.github.io/webrtc-landing/gum_test.html & lsof | grep $! | grep libasound.so

  Also not reproducible with automatically built package version
  2_1.0.25-4ubuntu3.1:

  mkdir libasound-old
  cd libasound-old
  wget http://archive.ubuntu.com/ubuntu/pool/main/a/alsa-lib/libasound2_1.0.25-4ubuntu3.1_amd64.deb
  ar p libasound2_1.0.25-4ubuntu3.1_amd64.deb data.tar.gz | tar -xzf -
  LD_PRELOAD=`pwd`/../lib/libasound.so.2.0.0 firefox http://mozilla.github.io/webrtc-landing/gum_test.html & lsof | grep $! | grep libasound.so

  I've also checked out the sources from upstream, there the bug also doesn't show up. Something in the way the package gets built automatically is messed up.
  I've verified the behaviour on two different hardwares.

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