mark@c2stable ~ $ gdb /opt/firefox/firefox core 
GNU gdb (Gentoo 7.3.1 p2) 7.3.1
Copyright (C) 2011 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 "x86_64-pc-linux-gnu".                                                                            
For bug reporting instructions, please see:                                                                                  
<http://bugs.gentoo.org/>...
/opt/firefox/firefox: No such file or directory.                                                                                 
[New LWP 10099]                                                                                                                  
[New LWP 10113]                                                                                                                  
[New LWP 10107]                                                                                                                  
[New LWP 10108]
[New LWP 10114]                                                                                                                       
[New LWP 10104]                                                                                                                       
[New LWP 10111]                                                                                                                       
[New LWP 10105]                                                                                                                       
[New LWP 10110]                                                                                                                       
[New LWP 10109]
[New LWP 10100]                                                                                                                         
[New LWP 10112]
[New LWP 10115]                                                                                                                            
[New LWP 10106]                                                                                                                            
Core was generated by `/usr/lib64/firefox/plugin-container
/opt/Adobe/flash-player/flash-plugin/libfla'.                                   
Program terminated with signal 11, Segmentation fault.
#0  0x00007febcf73f1c5 in ?? ()
(gdb) thread apply all backtrace full                                                                                                        

Thread 14 (LWP 10106):                                                                                                                        
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 13 (LWP 10115):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 12 (LWP 10112):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 11 (LWP 10100):
#0  0x00007febcd558b13 in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 10 (LWP 10109):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 9 (LWP 10110):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 8 (LWP 10105):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 7 (LWP 10111):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 6 (LWP 10104):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 5 (LWP 10114):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 4 (LWP 10108):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 3 (LWP 10107):
---Type <return> to continue, or q <return> to quit---
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 2 (LWP 10113):
#0  0x00007febcf94d47c in ?? ()
No symbol table info available.
#1  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 1 (LWP 10099):
#0  0x00007febcf73f1c5 in ?? ()
No symbol table info available.
#1  0x00007fffa4e1ee10 in ?? ()
No symbol table info available.
#2  0x00007febce7f3a02 in ?? ()
No symbol table info available.
#3  0x0000000000000001 in ?? ()
No symbol table info available.
#4  0x000000bebd4e20c0 in ?? ()
No symbol table info available.
#5  0x4120212121232323 in ?? ()
No symbol table info available.
#6  0x6552203a54524f42 in ?? ()
No symbol table info available.
#7  0x3331207473657571 in ?? ()
No symbol table info available.
#8  0x6142203a39322e36 in ?? ()
No symbol table info available.
#9  0x656d656c706d4964 in ?? ()
No symbol table info available.
#10 0x206e6f697461746e in ?? ()
No symbol table info available.
#11 0x2072657672657328 in ?? ()
No symbol table info available.
#12 0x746f6e2073656f64 in ?? ()
No symbol table info available.
#13 0x656d656c706d6920 in ?? ()
No symbol table info available.
#14 0x617265706f20746e in ?? ()
No symbol table info available.
#15 0x32203b296e6f6974 in ?? ()
No symbol table info available.
#16 0x7473657571657220 in ?? ()
No symbol table info available.
#17 0x66203a6f67612073 in ?? ()
No symbol table info available.
#18 0x7261762f20656c69 in ?? ()
No symbol table info available.
#19 0x726f702f706d742f in ?? ()
No symbol table info available.
#20 0x7777772f65676174 in ?? ()
No symbol table info available.
#21 0x2f746e65696c632d in ?? ()
No symbol table info available.
#22 0x2d786f6665726966 in ?? ()
No symbol table info available.
#23 0x722d312e302e3031 in ?? ()
No symbol table info available.
#24 0x6d2f6b726f772f31 in ?? ()
No symbol table info available.
#25 0x722d616c6c697a6f in ?? ()
No symbol table info available.
#26 0x742f657361656c65 in ?? ()
No symbol table info available.
#27 0x782f74696b6c6f6f in ?? ()
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#28 0x313158736e2f6572 in ?? ()
No symbol table info available.
#29 0x6e6148726f727245 in ?? ()
No symbol table info available.
#30 0x7070632e72656c64 in ?? ()
No symbol table info available.
#31 0x3120656e696c202c in ?? ()
No symbol table info available.
#32 0x00007febcf003039 in ?? ()
No symbol table info available.
#33 0x00007febcd847dcd in ?? ()
No symbol table info available.
#34 0x00007febc9f76510 in ?? ()
No symbol table info available.
#35 0x00007febcfd46000 in ?? ()
No symbol table info available.
#36 0x0000000000000000 in ?? ()
No symbol table info available.
(gdb) 
(gdb) quit
mark@c2stable ~ $