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

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https://bugs.launchpad.net/bugs/1417300

Title:
  Firefox froze while displaying the Applications tab in Preferences

Status in firefox package in Ubuntu:
  Incomplete

Bug description:
  I clicked Edit->Preferences, clicked through a few tabs, then clicked
  Applications. Firefox froze.

  Here's the stack trace:

  #0  pthread_cond_wait@@GLIBC_2.3.2 () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
  #1  0x00007f0ebc5d2320 in PR_WaitCondVar (cvar=0x7f0e4435f180, 
timeout=timeout@entry=4294967295) at 
/build/buildd/firefox-35.0.1+build1/nsprpub/pr/src/pthreads/ptsynch.c:385
  #2  0x00007f0ebc5da6f6 in _MD_WaitUnixProcess (process=0x7f0e2a83a9e8, 
exitCode=0x7fff6797be24) at 
/build/buildd/firefox-35.0.1+build1/nsprpub/pr/src/md/unix/uxproces.c:824
  #3  0x00007f0eb772aaa2 in nsProcess::Monitor (aArg=<optimized out>) at 
/build/buildd/firefox-35.0.1+build1/xpcom/threads/nsProcessCommon.cpp:276
  #4  0x00007f0eb772ac5f in nsProcess::RunProcess (this=0x7f0e43cd2350, 
aBlocking=128, aMyArgv=0x7f0e2b3e5f60, aObserver=0xffffffffffffffff, 
aHoldWeak=false, aArgsUTF8=false)
      at 
/build/buildd/firefox-35.0.1+build1/xpcom/threads/nsProcessCommon.cpp:540
  #5  0x00007f0eb772ad6b in nsProcess::CopyArgsAndRunProcess 
(this=0x7f0e43cd2350, aBlocking=<optimized out>, aArgs=0x7fff6797c088, 
aCount=<optimized out>, aObserver=0x0, 
      aHoldWeak=<optimized out>) at 
/build/buildd/firefox-35.0.1+build1/xpcom/threads/nsProcessCommon.cpp:375
  #6  0x00007f0eb7b4e3da in 
nsOSHelperAppService::GetHandlerAndDescriptionFromMailcapFile (aFilename=..., 
aMajorType=..., aMinorType=..., aHandler=..., aDescription=..., 
aMozillaFlags=...)
      at 
/build/buildd/firefox-35.0.1+build1/uriloader/exthandler/unix/nsOSHelperAppService.cpp:1091
  #7  0x00007f0eb7b4e5ed in nsOSHelperAppService::DoLookUpHandlerAndDescription 
(aMajorType=..., aMinorType=..., aHandler=..., aDescription=..., 
aMozillaFlags=..., 
      aUserData=aUserData@entry=false) at 
/build/buildd/firefox-35.0.1+build1/uriloader/exthandler/unix/nsOSHelperAppService.cpp:913
  #8  0x00007f0eb7b4f0f3 in nsOSHelperAppService::GetFromType 
(this=this@entry=0x7f0e9e25c640, aMIMEType=...)
      at 
/build/buildd/firefox-35.0.1+build1/uriloader/exthandler/unix/nsOSHelperAppService.cpp:1412
  #9  0x00007f0eb7b4f54b in nsOSHelperAppService::GetMIMEInfoFromOS 
(this=0x7f0e9e25c640, aType=..., aFileExt=..., aFound=0x7fff6797cad6)
      at 
/build/buildd/firefox-35.0.1+build1/uriloader/exthandler/unix/nsOSHelperAppService.cpp:1479
  #10 0x00007f0eb7b54998 in nsExternalHelperAppService::GetFromTypeAndExtension 
(this=0x7f0e9e25c640, aMIMEType=..., aFileExt=..., _retval=0x7fff6797cf10)
      at 
/build/buildd/firefox-35.0.1+build1/uriloader/exthandler/nsExternalHelperAppService.cpp:2552
  #11 0x00007f0eb7730ef3 in NS_InvokeByIndex (that=<optimized out>, 
methodIndex=<optimized out>, paramCount=<optimized out>, params=<optimized out>)
      at 
/build/buildd/firefox-35.0.1+build1/xpcom/reflect/xptcall/md/unix/xptcinvoke_x86_64_unix.cpp:164
  #12 0x00007f0eb7a6a250 in Invoke (this=0x7fff6797ce98) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNative.cpp:2396
  #13 Call (this=0x7fff6797ce98) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNative.cpp:1748
  #14 XPCWrappedNative::CallMethod (ccx=..., 
mode=mode@entry=XPCWrappedNative::CALL_METHOD) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNative.cpp:1715
  #15 0x00007f0eb7a70852 in XPC_WN_CallMethod (cx=0x7f0ebcc5b1a0, argc=2, 
vp=0x7f0ea4938358) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNativeJSOps.cpp:1247
  #16 0x00007f0eb90f10c5 in CallJSNative (args=..., native=<optimized out>, 
cx=<optimized out>) at 
/build/buildd/firefox-35.0.1+build1/js/src/jscntxtinlines.h:231
  #17 js::Invoke (cx=0x7f0ebcc5b1a0, args=..., construct=(js::CONSTRUCT | 
unknown: 4294967263)) at 
/build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:481
  #18 0x00007f0eb90e40fd in Interpret (cx=0x7f0ebcc5b1a0, state=...) at 
/build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:2546
  #19 0x00007f0eb90f0d2a in js::RunScript (cx=0x7f0ebcc5b1a0, state=...) at 
/build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:431
  #20 0x00007f0eb90f0f74 in js::Invoke (cx=0x7f0ebcc5b1a0, args=..., 
construct=(js::CONSTRUCT | unknown: 4294967263), 
construct@entry=js::NO_CONSTRUCT)
      at /build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:500
  #21 0x00007f0eb90f15c1 in js::Invoke (cx=cx@entry=0x7f0ebcc5b1a0, thisv=..., 
fval=..., argc=0, argv=<optimized out>, rval=...)
      at /build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:537
  #22 0x00007f0eb8f8df4a in JS_CallFunctionValue (cx=0x7f0ebcc5b1a0, obj=..., 
fval=..., args=..., rval=...) at 
/build/buildd/firefox-35.0.1+build1/js/src/jsapi.cpp:5086
  #23 0x00007f0eb7a6694d in nsXPCWrappedJSClass::CallMethod 
(this=0x7f0e7035bb80, wrapper=0x3f2000000920060, methodIndex=1, 
info_=0xffffffffffffffff, nativeParams=0x7f0e378fb000)
      at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedJSClass.cpp:1187
  #24 0x00007f0eb7731a87 in PrepareAndDispatch (self=0x7f0e70344a80, 
methodIndex=<optimized out>, args=<optimized out>, gpregs=0x7fff6797e980, 
fpregs=0x7fff6797e9b0)
      at 
/build/buildd/firefox-35.0.1+build1/xpcom/reflect/xptcall/md/unix/xptcstubs_x86_64_linux.cpp:122
  #25 0x00007f0eb7731005 in SharedStub () from /usr/lib/firefox/libxul.so
  #26 0x00007f0eb7730ef3 in NS_InvokeByIndex (that=<optimized out>, 
methodIndex=<optimized out>, paramCount=<optimized out>, params=<optimized out>)
      at 
/build/buildd/firefox-35.0.1+build1/xpcom/reflect/xptcall/md/unix/xptcinvoke_x86_64_unix.cpp:164
  #27 0x00007f0eb7a6a250 in Invoke (this=0x7fff6797eba8) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNative.cpp:2396
  #28 Call (this=0x7fff6797eba8) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNative.cpp:1748
  #29 XPCWrappedNative::CallMethod (ccx=..., 
mode=mode@entry=XPCWrappedNative::CALL_METHOD) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNative.cpp:1715
  #30 0x00007f0eb7a70852 in XPC_WN_CallMethod (cx=0x7f0e35dc7f60, argc=0, 
vp=0x7f0ea49381e8) at 
/build/buildd/firefox-35.0.1+build1/js/xpconnect/src/XPCWrappedNativeJSOps.cpp:1247
  #31 0x00007f0eb90f10c5 in CallJSNative (args=..., native=<optimized out>, 
cx=<optimized out>) at 
/build/buildd/firefox-35.0.1+build1/js/src/jscntxtinlines.h:231
  #32 js::Invoke (cx=0x7f0e35dc7f60, args=..., construct=(js::CONSTRUCT | 
unknown: 4294967263)) at 
/build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:481
  #33 0x00007f0eb90e40fd in Interpret (cx=0x7f0e35dc7f60, state=...) at 
/build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:2546
  #34 0x00007f0eb90f0d2a in js::RunScript (cx=0x7f0e35dc7f60, state=...) at 
/build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:431
  #35 0x00007f0eb90f0f74 in js::Invoke (cx=0x7f0e35dc7f60, args=..., 
construct=(js::CONSTRUCT | unknown: 4294967263), 
construct@entry=js::NO_CONSTRUCT)
      at /build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:500
  #36 0x00007f0eb90f15c1 in js::Invoke (cx=cx@entry=0x7f0e35dc7f60, thisv=..., 
fval=..., argc=1, argv=<optimized out>, rval=...)
      at /build/buildd/firefox-35.0.1+build1/js/src/vm/Interpreter.cpp:537
  #37 0x00007f0eb8f8dfaa in JS::Call (cx=cx@entry=0x7f0e35dc7f60, thisv=..., 
thisv@entry=..., fval=..., fval@entry=..., args=..., rval=..., rval@entry=...)
      at /build/buildd/firefox-35.0.1+build1/js/src/jsapi.cpp:5098
  #38 0x00007f0eb7e97a60 in mozilla::dom::Function::Call 
(this=this@entry=0x7f0e3852ea00, cx=0x7f0e35dc7f60, aThisVal=..., 
aThisVal@entry=..., arguments=..., aRetVal=..., aRetVal@entry=..., 
      aRv=...) at 
/build/buildd/firefox-35.0.1+build1/obj-x86_64-linux-gnu/dom/bindings/FunctionBinding.cpp:36
  #39 0x00007f0eb7ce02d6 in mozilla::dom::Function::Call<nsCOMPtr<nsISupports> 
> (this=this@entry=0x7f0e3852ea00, thisObjPtr=..., arguments=..., aRetVal=..., 
aRetVal@entry=..., aRv=..., 
      
aExceptionHandling=aExceptionHandling@entry=mozilla::dom::CallbackObject::eReportExceptions)
 at ../../dist/include/mozilla/dom/FunctionBinding.h:58
  #40 0x00007f0eb7ce0469 in nsGlobalWindow::RunTimeoutHandler 
(this=this@entry=0x7f0e256f4c00, aTimeout=aTimeout@entry=0x7f0e43af8400, 
aScx=<optimized out>)
      at /build/buildd/firefox-35.0.1+build1/dom/base/nsGlobalWindow.cpp:12244
  #41 0x00007f0eb7ce0d77 in nsGlobalWindow::RunTimeout (this=0x7f0e256f4c00, 
aTimeout=0x7f0e43af8400) at 
/build/buildd/firefox-35.0.1+build1/dom/base/nsGlobalWindow.cpp:12468
  #42 0x00007f0eb7ce0f78 in nsGlobalWindow::TimerCallback (aTimer=<optimized 
out>, aClosure=<optimized out>) at 
/build/buildd/firefox-35.0.1+build1/dom/base/nsGlobalWindow.cpp:12714
  #43 0x00007f0eb772e932 in nsTimerImpl::Fire (this=0x7f0e4435f18c) at 
/build/buildd/firefox-35.0.1+build1/xpcom/threads/nsTimerImpl.cpp:618
  #44 0x00007f0eb772eaa2 in nsTimerEvent::Run (this=0x7f0e623af890) at 
/build/buildd/firefox-35.0.1+build1/xpcom/threads/nsTimerImpl.cpp:711
  #45 0x00007f0eb772c1cc in nsThread::ProcessNextEvent (this=0x7f0ebcceaa00, 
aMayWait=<optimized out>, aResult=0x7fff6798089f)
      at /build/buildd/firefox-35.0.1+build1/xpcom/threads/nsThread.cpp:830
  #46 0x00007f0eb773d20f in NS_ProcessNextEvent (aThread=<optimized out>, 
aMayWait=aMayWait@entry=false) at 
/build/buildd/firefox-35.0.1+build1/xpcom/glue/nsThreadUtils.cpp:265
  #47 0x00007f0eb78f1b2a in mozilla::ipc::MessagePump::Run 
(this=0x7f0eac429e80, aDelegate=0x7f0eac407500) at 
/build/buildd/firefox-35.0.1+build1/ipc/glue/MessagePump.cpp:99
  #48 0x00007f0eb78e3947 in RunHandler (this=0x7f0eac407500) at 
/build/buildd/firefox-35.0.1+build1/ipc/chromium/src/base/message_loop.cc:223
  #49 MessageLoop::Run (this=0x7f0eac407500) at 
/build/buildd/firefox-35.0.1+build1/ipc/chromium/src/base/message_loop.cc:197
  #50 0x00007f0eb82fdb8e in nsBaseAppShell::Run (this=0x7f0e4435f18c) at 
/build/buildd/firefox-35.0.1+build1/widget/xpwidgets/nsBaseAppShell.cpp:164
  #51 0x00007f0eb8a1758b in nsAppStartup::Run (this=0x7f0ea243d060) at 
/build/buildd/firefox-35.0.1+build1/toolkit/components/startup/nsAppStartup.cpp:281
  #52 0x00007f0eb8a46e99 in XREMain::XRE_mainRun 
(this=this@entry=0x7fff67980b28) at 
/build/buildd/firefox-35.0.1+build1/toolkit/xre/nsAppRunner.cpp:4191
  #53 0x00007f0eb8a47112 in XREMain::XRE_main (this=this@entry=0x7fff67980b28, 
argc=argc@entry=1, argv=argv@entry=0x7fff67982038, 
aAppData=aAppData@entry=0x7fff67980d38)
      at /build/buildd/firefox-35.0.1+build1/toolkit/xre/nsAppRunner.cpp:4267
  #54 0x00007f0eb8a47346 in XRE_main (argc=1, argv=0x7fff67982038, 
aAppData=0x7fff67980d38, aFlags=<optimized out>) at 
/build/buildd/firefox-35.0.1+build1/toolkit/xre/nsAppRunner.cpp:4485
  #55 0x00007f0ebdfa244c in do_main (argc=1, argv=0x7fff67982038, 
xreDirectory=0x7f0ebcc53780) at 
/build/buildd/firefox-35.0.1+build1/browser/app/nsBrowserApp.cpp:287
  #56 0x00007f0ebdfa1bc3 in main (argc=1, argv=0x7fff67982038) at 
/build/buildd/firefox-35.0.1+build1/browser/app/nsBrowserApp.cpp:652

  It looks like Firefox launched another process and was waiting for it
  to exit - though I couldn't tell which process it was. (All of the
  arguments in the stack trace were optimized out.)

  I found all processes whose parent PID was Firefox:
  23079 ?        Sl     0:14 /usr/lib/firefox/plugin-container 
/opt/google/talkplugin/libnpgoogletalk.so -greomni /usr/lib/firefox/omni.ja 
-appomni /usr/lib/firefox/browser/omni.ja -appdir /usr/lib/firefox/brows
  23456 ?        Sl     2:02 /usr/lib/firefox/plugin-container 
/usr/lib/flashplugin-installer/libflashplayer.so -greomni 
/usr/lib/firefox/omni.ja -appomni /usr/lib/firefox/browser/omni.ja -appdir 
/usr/lib/firefo
  25393 ?        Z      0:00 [sh] <defunct>

  I'm guessing it's the last one. Maybe there's a race condition where
  the process exits before Firefox starts waiting for it?

  The bug only happened the first time, and I couldn't reproduce it
  again.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: firefox 35.0.1+build1-0ubuntu0.14.10.1
  Uname: Linux 3.19.0-031900rc6-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.7-0ubuntu8.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dima       2529 F.... pulseaudio
  BuildID: 20150125221831
  Channel: Unavailable
  CurrentDesktop: KDE
  Date: Mon Feb  2 14:22:43 2015
  EcryptfsInUse: Yes
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions:
   English (South Africa) Language Pack - [email protected]
   English (GB) Language Pack - [email protected]
   Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
  InstallationDate: Installed on 2013-04-05 (668 days ago)
  InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 
(20121017.1)
  IpRoute:
   default via 172.16.20.1 dev eth0  proto static 
   172.16.20.0/24 dev eth0  proto kernel  scope link  src 172.16.20.177  metric 
1 
   172.16.84.0/22 dev wlan0  proto kernel  scope link  src 172.16.84.241  
metric 9
  Plugins:
   Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
   IcedTea-Web Plugin (using IcedTea-Web 1.5.2 (1.5.2-1ubuntu2~14.10)) - 
/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/IcedTeaPlugin.so 
(icedtea-7-plugin)
   Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so 
(google-talkplugin)
   Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so 
(google-talkplugin)
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=35.0.1/20150125221831 (In use)
  RelatedPackageVersions:
   icedtea-7-plugin  1.5.2-1ubuntu2~14.10
   google-talkplugin 5.38.6.0-1
  RunningIncompatibleAddons: True
  SourcePackage: firefox
  UpgradeStatus: Upgraded to utopic on 2014-09-29 (126 days ago)
  dmi.bios.date: 01/22/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.name: 085X6F
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: 
dmi:bvnDellInc.:bvrA08:bd01/22/2013:svnDellInc.:pnDellSystemXPSL321X:pvr:rvnDellInc.:rn085X6F:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L321X
  dmi.sys.vendor: Dell Inc.

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