Comment 4 for bug 77859

As suggested by Peter Cherriman (https://launchpad.net/~pjcherriman) in comment:

https://launchpad.net/ubuntu/+source/firefox/+bug/77859/comments/3

I've installed the firefox-dbg package (ie, debug symbols), and regenerated the core dump and run gdb over it. Like him I see:

nsPasswordManager::AttachToInput (this=0x89f6368, aElement=0x0) at nsPasswordManager.cpp:1962

as the topmost item on the stack prior to the signal handler being invoked, so I too suspect that aElement=0x0 is somehow involved in the segmentation fault.

Full gdb backtrace follows.

Ewen

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ewen@wat:/var/tmp$ ulimit -c unlimited
ewen@wat:/var/tmp$ firefox &
[1] 26943
ewen@wat:/var/tmp$
[1]+ Segmentation fault (core dumped) firefox
ewen@wat:/var/tmp$ ls -l core*
-rw------- 1 ewen ewen 55312384 2007-01-06 12:38 core.26943
ewen@wat:/var/tmp$ gdb /usr/lib/firefox/firefox-bin core.26943
GNU gdb 6.4-debian
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welcome to change it and/or distribute copies of it under certain conditions.
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This GDB was configured as "i486-linux-gnu"...Using host libthread_db library "/
lib/tls/i686/cmov/libthread_db.so.1".

Core was generated by `/usr/lib/firefox/firefox-bin -a firefox'.
Program terminated with signal 11, Segmentation fault.

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /usr/lib/firefox/libmozjs.so...Reading symbols from /usr/li
b/debug/usr/lib/firefox/libmozjs.so...done.
done.
[....]
Loaded symbols for /usr/lib/firefox/components/libnkgnomevfs.so
#0 0xffffe410 in __kernel_vsyscall ()
(gdb) bt
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb7d8d790 in raise () from /lib/tls/i686/cmov/libpthread.so.0
#2 0x08055e0b in nsProfileLock::FatalSignalHandler (signo=-1210510412)
    at nsProfileLock.cpp:206
#3 <signal handler called>
#4 0xb67e65cc in nsPasswordManager::AttachToInput (this=0x89f6368,
    aElement=0x0) at nsPasswordManager.cpp:1962
#5 0xb67e7724 in nsPasswordManager::OnStateChange (this=0x89f6368,
    aWebProgress=0x86a6cec, aRequest=0x86939b4, aStateFlags=131088, aStatus=0)
    at nsPasswordManager.cpp:948
#6 0xb5dd3e62 in nsDocLoader::FireOnStateChange (this=0x8205c88,
    aProgress=0x86a6cec, aRequest=0x86939b4, aStateFlags=131088, aStatus=0)
    at nsDocLoader.cpp:1210
#7 0xb5dd3ea0 in nsDocLoader::FireOnStateChange (this=0x835a5b8,
    aProgress=0x86a6cec, aRequest=0x86939b4, aStateFlags=131088, aStatus=0)
    at nsDocLoader.cpp:1217
#8 0xb5dd3ea0 in nsDocLoader::FireOnStateChange (this=0x86a6cd8,
    aProgress=0x86a6cec, aRequest=0x86939b4, aStateFlags=131088, aStatus=0)
    at nsDocLoader.cpp:1217
#9 0xb5dd423b in nsDocLoader::doStopDocumentLoad (this=0x86a6cd8,
    request=0x86939b4, aStatus=0) at nsDocLoader.cpp:833
#10 0xb5dd4313 in nsDocLoader::DocLoaderIsEmpty (this=0x86a6cd8)
    at nsDocLoader.cpp:739
#11 0xb5dd45df in nsDocLoader::OnStopRequest (this=0x86a6cd8,
    aRequest=0x890d118, aCtxt=0x0, aStatus=0) at nsDocLoader.cpp:662
#12 0xb723ae35 in nsLoadGroup::RemoveRequest (this=0x86a6740,
    request=0x890d118, ctxt=0x0, aStatus=0) at nsLoadGroup.cpp:732
#13 0xb56c0c6e in nsDocument::UnblockOnload (this=0x88ff600)
    at nsDocument.cpp:5015
#14 0xb56e256a in DestroyImagePLEvent (aEvent=0x8a09438)
    at nsImageLoadingContent.cpp:668
#15 0xb7e40351 in PL_DestroyEvent (self=0x8a09438) at plevent.c:727
#16 0xb7e403bd in PL_HandleEvent (self=0x8a09438) at plevent.c:699
#17 0xb7e40b2e in PL_ProcessPendingEvents (self=0x80d3758) at plevent.c:623
#18 0xb7e41ed0 in nsEventQueueImpl::ProcessPendingEvents (this=0x80d3710)
    at nsEventQueue.cpp:417
#19 0xb68a3449 in event_processor_callback (source=0x8312d28,
    condition=G_IO_IN, data=0x0) at nsAppShell.cpp:67
#20 0xb77bc52c in g_vasprintf () from /usr/lib/libglib-2.0.so.0
#21 0xb77958d6 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#22 0xb7798996 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#23 0xb7798cb8 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#24 0xb7bc7765 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#25 0xb68a38da in nsAppShell::Run (this=0x814e778) at nsAppShell.cpp:139
#26 0xb67c33d2 in nsAppStartup::Run (this=0x814e738) at nsAppStartup.cpp:150
#27 0x0804f321 in XRE_main (argc=3, argv=0xbf82acf4, aAppData=0x80595e0)
    at nsAppRunner.cpp:2380
#28 0x0804abe4 in main (argc=0, argv=0x0) at nsBrowserApp.cpp:61
#29 0xb752bea2 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#30 0x0804ab31 in _start () at ../sysdeps/i386/elf/start.S:119
(gdb)
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