Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: firefox (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/926298

Title:
  plugin-container crashed with SIGSEGV in start_thread()

Status in “firefox” package in Ubuntu:
  Confirmed

Bug description:
  I was browsing the web and downloading some files, suddenly firefox
  crashed. I had about 30 Tabs open.

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: firefox 11.0~a2~hg20120129r84301-0ubuntu1~umd2
  ProcVersionSignature: Ubuntu 3.2.0-12.21-generic-pae 3.2.2
  Uname: Linux 3.2.0-12-generic-pae i686
  AddonCompatCheckDisabled: False
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.91-0ubuntu1
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC272X Analog [ALC272X Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  daniel     2173 F.... pulseaudio
   /dev/snd/controlC0:  daniel     2173 F.... pulseaudio
  BuildID: 20120130070908
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf0600000 irq 44'
     Mixer name : 'Realtek ALC272X'
     Components : 'HDA:10ec0272,10250379,00100001'
     Controls      : 20
     Simple ctrls  : 11
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xcfedc000 irq 46'
     Mixer name : 'ATI R6xx HDMI'
     Components : 'HDA:1002aa01,00aa0100,00100200'
     Controls      : 6
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'IEC958',0
     Capabilities: pswitch pswitch-joined penum
     Playback channels: Mono
     Mono: Playback [on]
  Channel: aurora
  Date: Fri Feb  3 20:31:46 2012
  ExecutablePath: /usr/lib/firefox-11.0a2/plugin-container
  ForcedLayersAccel: False
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   treely - [email protected], Version=2.2, minVersion=3.5, 
maxVersion=10.0a1, Location=app-profile, Type=extension, Active=Yes
   British English Dictionary - [email protected], 
Version=1.19.1, minVersion=2.0b1, maxVersion=11.0a1, Location=app-profile, 
Type=extension, Active=Yes
   German Dictionary - [email protected], Version=2.0.2, 
minVersion=1.9a8pre, maxVersion=2.0.*, Location=app-profile, Type=extension, 
Active=Yes
   Test Pilot - [email protected], Version=1.2, minVersion=3.5, 
maxVersion=10.*, Location=app-profile, Type=extension, Active=Yes
   Novell Moonlight - [email protected], Version=3.99.0.3, 
minVersion=1.5, maxVersion=4.0.*, Location=app-profile, Type=extension, 
Active=Yes
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  IpRoute:
   default via 192.168.178.1 dev eth0  proto static 
   169.254.0.0/16 dev eth0  scope link  metric 1000 
   192.168.178.0/24 dev eth0  proto kernel  scope link  src 192.168.178.21  
metric 1
  ProcCmdline: /usr/lib/firefox-11.0a2/plugin-container 
/usr/lib/flashplugin-installer/libflashplayer.so -greomni 
/usr/lib/firefox-11.0a2/omni.ja 2321 plugin
  ProcEnviron:
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=11.0a2/20120130070908 (Running)
  RunningIncompatibleAddons: True
  SegvAnalysis:
   Segfault happened at: 0xb5bb5410 <__memcpy_ssse3_rep+64>:    movdqu 
(%eax),%xmm0
   PC (0xb5bb5410) ok
   source "(%eax)" (0xa9419338) not located in a known VMA region (needed 
readable region)!
   destination "%xmm0" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: firefox
  StacktraceTop:
   ?? () from /usr/lib/flashplugin-installer/libflashplayer.so
   ?? () from /usr/lib/flashplugin-installer/libflashplayer.so
   ?? () from /usr/lib/flashplugin-installer/libflashplayer.so
   start_thread (arg=0x9f0ffb70) at pthread_create.c:304
   clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
  Title: plugin-container crashed with SIGSEGV in start_thread()
  UpgradeStatus: Upgraded to precise on 2012-01-12 (22 days ago)
  UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lpadmin netdev 
plugdev sambashare tape video
  dmi.bios.date: 04/28/2011
  dmi.bios.vendor: Phoenix Technologies LTD
  dmi.bios.version: V1.26
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: SJV71_CP
  dmi.board.vendor: Packard Bell
  dmi.board.version: V1.26
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Packard Bell
  dmi.chassis.version: V1.26
  dmi.modalias: 
dmi:bvnPhoenixTechnologiesLTD:bvrV1.26:bd04/28/2011:svnPackardBell:pnEasyNoteLM85:pvrV1.26:rvnPackardBell:rnSJV71_CP:rvrV1.26:cvnPackardBell:ct10:cvrV1.26:
  dmi.product.name: EasyNote LM85
  dmi.product.version: V1.26
  dmi.sys.vendor: Packard Bell

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