pulseaudio crashed with SIGSEGV (parallel calls to dbus_bus_get_private)

[Brian_Clem]

Jack audio server. Low latency kernel. Using Ubuntu then Lubuntu via- wubi.exe

Lubuntu was not available through wubi.exe Only ubuntu. All other variations produced errors. I think needed audio packages for multitrack recording via-Ardour and Rosegarden create unstable system state.

Jack crashes pulse audio adapter ... rebooting seems to help sometimes.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: pulseaudio 1:1.1-0ubuntu9
ProcVersionSignature: Ubuntu 3.0.0-13.21ppa1~natty1-lowlatency 3.0.6
Uname: Linux 3.0.0-13-lowlatency x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 1.92-0ubuntu1
Architecture: amd64
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf0520000 irq 49'
   Mixer name : 'Analog Devices AD1884A'
   Components : 'HDA:11d4184a,103c3034,00100200'
   Controls : 34
   Simple ctrls : 20
CrashCounter: 1
Date: Tue Feb 21 11:46:52 2012
ExecutablePath: /usr/bin/pulseaudio
ProcCmdline: /usr/bin/pulseaudio --start --log-target=syslog
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fc58dfd15ee: mov %rdx,0x8(%rax)
 PC (0x7fc58dfd15ee) ok
 source "%rdx" ok
 destination "0x8(%rax)" (0xc46c000000000008) not located in a known VMA region (needed writable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: pulseaudio
StacktraceTop:
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? () from /lib/x86_64-linux-gnu/libdbus-1.so.3
Title: pulseaudio crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
dmi.bios.date: 03/05/2009
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 786G1 v01.16
dmi.board.asset.tag: 2UA92918QC
dmi.board.name: 3031h
dmi.board.vendor: Hewlett-Packard
dmi.chassis.asset.tag: 2UA92918QC
dmi.chassis.type: 4
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr786G1v01.16:bd03/05/2009:svnHewlett-Packard:pnHPCompaqdc7900SmallFormFactor:pvr:rvnHewlett-Packard:rn3031h:rvr:cvnHewlett-Packard:ct4:cvr:
dmi.product.name: HP Compaq dc7900 Small Form Factor
dmi.sys.vendor: Hewlett-Packard

[Apport retracing service (apport)]

StacktraceTop:
 link_before (link=0xc46c18, before_this_link=0xc46c00, list=0x7fc5540009e0) at ../../dbus/dbus-list.c:122
 _dbus_list_prepend (list=0x7fc5540009e0, data=<optimized out>) at ../../dbus/dbus-list.c:278
 _dbus_list_append (list=0x7fc5540009e0, data=<optimized out>) at ../../dbus/dbus-list.c:250
 _dbus_watch_list_add_watch (watch_list=0x7fc5540009e0, watch=0x7fc554000ba0) at ../../dbus/dbus-watch.c:361
 socket_connection_set (transport=0x7fc554000a20) at ../../dbus/dbus-transport-socket.c:1010

[David Henningsson (diwic)]

This looks like a race in dbus caused by two threads trying to get a private connection simultaneously.

[David Henningsson (diwic)]

I have created a small test case and sent bug upstream: https://bugs.freedesktop.org/show_bug.cgi?id=47060

[David Henningsson (diwic)]

According to upstream, we have forgotten to call dbus_init_threads_default. Fixing.

[Launchpad Janitor (janitor)]

This bug was fixed in the package pulseaudio - 1:1.1-0ubuntu13

---------------
pulseaudio (1:1.1-0ubuntu13) precise; urgency=low

  * 0020-daemon-Initialize-dbus-to-use-thread-safe-mode-by-de.patch:
    Make sure dbus is thread safe to avoid crashes in pa_make_realtime
    (LP: #937933)
  * 0111-protocol-native-Protect-against-clients-trying-to-se.patch:
    Don't crash if clients try to set a NULL port (LP: #951273)
  * 0021-Fix-input-device-for-M-audio-fasttrack-pro.patch:
    Probe two different input devices (LP: #569932)
  * 0112-module-loopback-Never-call-adjust_rates-after-teardo.patch:
    Don't crash on shutdown in module-loopback (LP: #946400)
  * 0619-module-switch-on-port-available-Do-not-switch-profil.patch:
    Prevent switching to HDMI profiles from analog profiles, as a result
    of discussion on the pulseaudio-discuss and ubuntu-audio-dev mailinglist.
 -- David Henningsson <email address hidden> Wed, 21 Mar 2012 10:47:33 +0100