1043115 - infinite loop in _XReply at startup

Status: UNCONFIRMED

(Core :: Graphics, defect)

Description

[Paul]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:32.0) Gecko/20100101 Firefox/32.0 (Beta/Release)
Build ID: 20140721115042

Steps to reproduce:

Upgraded to firefox_33.0~a2~hg20140722r209110 from the Ubuntu Mozilla Daily PPA, and started Firefox.


Actual results:

A single Firefox window appeared, with the tab bar visible yet containing only one tab and some graphical artefact in the empty space (looking like a very long stretched tab). Firefox spun on both cores for a long time (over 10 minutes) until killed. Before killing, attached gdb and got the following stack trace:

#0  0x00007ffa6b185430 in _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#1  0x00007ffa6b16a257 in XGetAtomName ()
   from /usr/lib/x86_64-linux-gnu/libX11.so.6
#2  0x00007ffa6c06ee64 in gdk_x11_xatom_to_atom_for_display ()
   from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#3  0x00007ffa6c064e96 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#4  0x00007ffa6c066116 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#5  0x00007ffa6c0661be in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#6  0x00007ffa6d3b7e04 in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007ffa6d3b8048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007ffa6d3b80ec in g_main_context_iteration ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007ffa6fbc1dac in nsAppShell::ProcessNextNativeEvent (
    this=<optimised out>, mayWait=<optimised out>)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/widget/gtk/nsAppShell.cpp:156
#10 0x00007ffa6fbef959 in nsBaseAppShell::DoProcessNextNativeEvent (
    this=this@entry=0x7ffa65b5d120, mayWait=mayWait@entry=false, 
    recursionDepth=recursionDepth@entry=0)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/widget/xpwidgets/nsBaseAppShell.cpp:140
#11 0x00007ffa6fbefa52 in nsBaseAppShell::OnProcessNextEvent (
    this=0x7ffa65b5d120, thr=0x7ffa743ec690, mayWait=false, recursionDepth=0)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/widget/xpwidgets/nsBaseAppShell.cpp:286
#12 0x00007ffa6f3117ff in nsThread::ProcessNextEvent (this=0x7ffa743ec690, 
    aMayWait=<optimised out>, aResult=0x7fff3fa4029f)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/xpcom/threads/nsThread.cpp:741
#13 0x00007ffa6f2cd997 in NS_ProcessNextEvent (aThread=<optimised out>, 
    aMayWait=aMayWait@entry=false)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/xpcom/glue/nsThreadUtils.cpp:265
#14 0x00007ffa6f4be924 in mozilla::ipc::MessagePump::Run (this=0x7ffa65b5f140, 
    aDelegate=0x7ffa74381360)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/ipc/glue/MessagePump.cpp:99
#15 0x00007ffa6f4b0093 in RunHandler (this=0x7ffa74381360)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/ipc/chromium/src/base/message_loop.cc:222
#16 MessageLoop::Run (this=0x7ffa74381360)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/ipc/chromium/src/base/message_loop.cc:196
#17 0x00007ffa6fbef45b in nsBaseAppShell::Run (this=0x7ffa65b5d120)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/widget/xpwidgets/nsBaseAppShell.cpp:164
#18 0x00007ffa70506d40 in nsAppStartup::Run (this=0x7ffa5e36a0b0)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/toolkit/components/startup/nsAppStartup.cpp:278
#19 0x00007ffa704e7aa3 in XREMain::XRE_mainRun (this=this@entry=0x7fff3fa40510)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/toolkit/xre/nsAppRunner.cpp:4013
#20 0x00007ffa704e7cf2 in XREMain::XRE_main (this=this@entry=0x7fff3fa40510, 
    argc=argc@entry=1, argv=argv@entry=0x7fff3fa41a08, 
    aAppData=aAppData@entry=0x7fff3fa40710)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/toolkit/xre/nsAppRunner.cpp:4084
#21 0x00007ffa704e7f24 in XRE_main (argc=1, argv=0x7fff3fa41a08, 
    aAppData=0x7fff3fa40710, aFlags=<optimised out>)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/toolkit/xre/nsAppRunner.cpp:4298
#22 0x00007ffa756e73c1 in do_main (argc=1, argv=0x7fff3fa41a08, 
    xreDirectory=0x7ffa7434d6c0)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/browser/app/nsBrowserApp.cpp:282
#23 0x00007ffa756e6b7c in main (argc=1, argv=0x7fff3fa41a08)
    at /build/buildd/firefox-33.0~a2~hg20140722r209110/browser/app/nsBrowserApp.cpp:643

The call to _XReply at the top of the trace does not return:

(gdb) next
Single stepping until exit from function _XReply,
which has no line number information.
^CQuit


Expected results:

Firefox should have started as usual.

Comment 1

[Paul Silaghi, QA [:pauly]]

Please check if the issue occurs using Firefox in safe mode (with your addons disabled):
http://support.mozilla.com/kb/Safe+Mode

And on a new, empty profile:
http://support.mozilla.org/en-US/kb/Managing-profiles#w_starting-the-profile-manager

Comment 2

[[:Aleksej]]

If the above helps, disabling hardware acceleration might be useful.  Maybe by putting this into the prefs.js file in your profile:

user_pref("layers.acceleration.disabled", true);

Also, your build may be different from Mozilla ones.  Can you reproduce it with a build from https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/ ?  Nightly builds are called "mozilla-central"

Comment 3

[Paul]

After upgrading to the latest PPA version of Firefox 33, there's an error in related libraries, followed by a segfault:

[xcb] Too much data requested from _XRead
[xcb] This is most likely caused by a broken X extension library
[xcb] Aborting, sorry about that.
firefox: ../../src/xcb_io.c:736: _XRead: Assertion `!xcb_xlib_too_much_data_requested' failed.

Safe Mode works, but if I disable all add-ons while in Safe Mode and restart in normal mode, the infinite loop recurs.

Creating a new profile, or resetting the existing profile, solve the issue, but I lose all history, tabs, bookmarks, and other customisations.

Is this likely caused by custom settings in about:config, or some other modifications?