Public bug reported: 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. ** Affects: alsa-lib (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1254562 Title: firefox gets 100% cpu and sometimes segfaults when using deb built package libasound2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-lib/+bug/1254562/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
