[Bug 510548] Re: Crash on certain websites

[Lepe]

I installed firefox-dbg ant tried to debug the error using gdb (I
followed the instructions in other post as is the first time I use gdb).
This is the output:

$ firefox -g
sh /usr/lib/firefox-3.6.3pre/run-mozilla.sh /usr/bin/gdb /usr/lib/firefox-3.6.3pre/firefox-bin -x /tmp/mozargs.oOAzUP
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/lib/firefox-3.6.3pre/firefox...Reading symbols from /usr/lib/debug/usr/lib/firefox-3.6.3pre/firefox-bin...done.
(no debugging symbols found)...done.
(gdb) set args -a firefox --sync
(gdb) break gdk_x_error
Function "gdk_x_error" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (gdk_x_error) pending.
(gdb) run
Starting program: /usr/lib/firefox-3.6.3pre/firefox -a firefox --sync
[Thread debugging using libthread_db enabled]

(firefox:2856): GLib-WARNING **: g_set_prgname() called multiple times
[New Thread 0xb53ffb70 (LWP 2860)]
[New Thread 0xb4bfeb70 (LWP 2861)]
[New Thread 0xb43fdb70 (LWP 2862)]
[New Thread 0xb36ffb70 (LWP 2863)]
[New Thread 0xb2cffb70 (LWP 2864)]
[Thread 0xb2cffb70 (LWP 2864) exited]
[New Thread 0xb2cffb70 (LWP 2865)]
[New Thread 0xb17bdb70 (LWP 2876)]
[New Thread 0xb0fbcb70 (LWP 2878)]
[New Thread 0xafc58b70 (LWP 2884)]
[New Thread 0xaf457b70 (LWP 2886)]
[Thread 0xb0fbcb70 (LWP 2878) exited]
[Thread 0xb2cffb70 (LWP 2865) exited]
[Thread 0xb17bdb70 (LWP 2876) exited]
[Thread 0xaf457b70 (LWP 2886) exited]
[New Thread 0xb2cffb70 (LWP 2953)]
[New Thread 0xb0fbcb70 (LWP 2954)]
[New Thread 0xaf457b70 (LWP 2966)]
[New Thread 0xb17bdb70 (LWP 2980)]
[Thread 0xb17bdb70 (LWP 2980) exited]
[New Thread 0xaafffb70 (LWP 3003)]
[Thread 0xaafffb70 (LWP 3003) exited]
[New Thread 0xaafffb70 (LWP 3007)]
[Thread 0xafc58b70 (LWP 2884) exited]
[New Thread 0xafc58b70 (LWP 3009)]
[New Thread 0xb17bdb70 (LWP 3010)]
[New Thread 0xa9affb70 (LWP 3011)]
[New Thread 0xa92feb70 (LWP 3012)]
[New Thread 0xa77ffb70 (LWP 3013)]
[Thread 0xa77ffb70 (LWP 3013) exited]
[New Thread 0xa77ffb70 (LWP 3017)]
[New Thread 0xa56ffb70 (LWP 3018)]
[New Thread 0xa40ffb70 (LWP 3019)]
[Thread 0xa40ffb70 (LWP 3019) exited]
[New Thread 0xa40ffb70 (LWP 3020)]
[Thread 0xa40ffb70 (LWP 3020) exited]
[New Thread 0xa40ffb70 (LWP 3021)]
[Thread 0xa40ffb70 (LWP 3021) exited]
[New Thread 0xa40ffb70 (LWP 3022)]
[Thread 0xa40ffb70 (LWP 3022) exited]

(firefox:2856): GLib-GObject-WARNING **: invalid unclassed pointer in
cast to `GtkObject'

(firefox:2856): GLib-GObject-WARNING **: instance with invalid (NULL)
class pointer

(firefox:2856): GLib-GObject-CRITICAL **: g_signal_handler_disconnect:
assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(firefox:2856): GLib-GObject-WARNING **: instance with invalid (NULL)
class pointer

(firefox:2856): GLib-GObject-CRITICAL **: g_signal_handler_disconnect:
assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(firefox:2856): GLib-GObject-WARNING **: invalid unclassed pointer in
cast to `GtkObject'

(firefox:2856): GLib-GObject-WARNING **: instance with invalid (NULL)
class pointer

(firefox:2856): GLib-GObject-CRITICAL **: g_signal_handler_disconnect:
assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(firefox:2856): GLib-GObject-WARNING **: instance with invalid (NULL)
class pointer

(firefox:2856): GLib-GObject-CRITICAL **: g_signal_handler_disconnect: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
[New Thread 0xa40ffb70 (LWP 3023)]
[Thread 0xa40ffb70 (LWP 3023) exited]

Program received signal SIGSEGV, Segmentation fault.
0xb694d072 in g_type_check_instance_cast () from /usr/lib/libgobject-2.0.so.0
(gdb)

NOTE: I had to rename some files in order to use gdb as it was saying
that "firefox" was not a binary file (it was trying to read a shell
script in /usr/lib/firefox-3.6.3pre/firefox).

-- 
Crash on certain websites
https://bugs.launchpad.net/bugs/510548
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