chris@jupiter:~/Emulation/Game Boy$ LANG="en_US.UTF-8" gdb /usr/local/stow/mednafen-0.8.C-rc1/bin/mednafen
GNU gdb 6.8-debian
Copyright (C) 2008 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-linux-gnu"...
(gdb) run fortress_of_fear.gb
Starting program: /usr/local/stow/mednafen-0.8.C-rc1/bin/mednafen fortress_of_fear.gb
[Thread debugging using libthread_db enabled]
[New Thread 0x7f71309e9750 (LWP 5000)]
Starting Mednafen 0.8.C-rc1
 Loading settings from "/home/chris/.mednafen/mednafen.cfg"...
 Compiled against SDL 1.2.13, running with SDL 1.2.13

 Initializing joysticks...
  Joystick 0 - Logitech Logitech RumblePad 2 USB - Unique ID: 080e4a1ee1ed960b
 Loading fortress_of_fear.gb...

  ROM:       64KiB
  ROM CRC32: 0x104eb503
  ROM MD5:   0xf9445b104ebb70d8fb91c8c64452c0a4

  Loading cheats from /home/chris/.mednafen/cheats/gb.cht...
   0 cheats loaded.

 Initializing sound...
[New Thread 0x7f712794f950 (LWP 5003)]
  Using "OSS(/dev/dsp*)" audio driver with device "/dev/dsp":
   Bits: 16
   Rate: 48000
   Channels: 2
   Byte order: CPU Native
   Buffer size: 4864 sample frames(101.333333 ms)
[New Thread 0x7f712714e950 (LWP 5004)]
 Initializing video...
  Video Mode: 1600 x 1200 x 32 bpp
  OpenGL: Yes
   Pixel shader: none
  Fullscreen: Yes
  Special Scaler: None
  Scanlines: Off
  Destination Rectangle: X=160, Y=24, W=1280, H=1152
  OpenGL Implementation: NVIDIA Corporation GeForce 8800 GT/PCI/SSE2 3.0.0 NVIDIA 180.44
  Checking extensions:
   GL_ARB_texture_non_power_of_two found.
  Using non-power-of-2 sized textures.
  Checking maximum texture size...
   Apparently it is at least: 8192 x 8192
 Initializing video...
  Video Mode: 1280 x 1152 x 32 bpp
  OpenGL: Yes
   Pixel shader: none
  Fullscreen: No
  Special Scaler: None
  Scanlines: Off
  Destination Rectangle: X=0, Y=0, W=1280, H=1152
  OpenGL Implementation: NVIDIA Corporation GeForce 8800 GT/PCI/SSE2 3.0.0 NVIDIA 180.44
  Checking extensions:
   GL_ARB_texture_non_power_of_two found.
  Using non-power-of-2 sized textures.
  Checking maximum texture size...
   Apparently it is at least: 8192 x 8192

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7f712714e950 (LWP 5004)]
0x00000000004e74bb in gbReadMemory (address=40963) at gb.cpp:823
823	      retval = gbMemoryMap[address>>12][address & 0x0fff & gbRamSizeMask];

(gdb) bt
#0  0x00000000004e74bb in gbReadMemory (address=40963) at gb.cpp:823
#1  0x00000000004f5269 in GBZ80_RunOp () at gbCodes.h:620
#2  0x00000000004e7cc0 in Emulate (espec=0x7f712714e020) at gb.cpp:2097
#3  0x000000000041339f in MDFNI_Emulate (espec=0x7f712714e020) at mednafen.cpp:554
#4  0x0000000000479783 in GameLoop (arg=0x0) at drivers/main.cpp:735
#5  0x00007f712f3bae47 in ?? () from /usr/lib/libSDL-1.2.so.0
#6  0x00007f712f400369 in ?? () from /usr/lib/libSDL-1.2.so.0
#7  0x00007f712f64b3ba in start_thread () from /lib/libpthread.so.0
#8  0x00007f712e770fcd in clone () from /lib/libc.so.6
#9  0x0000000000000000 in ?? ()

(gdb) bt full
#0  0x00000000004e74bb in gbReadMemory (address=40963) at gb.cpp:823
	retval = 255 '�'
#1  0x00000000004f5269 in GBZ80_RunOp () at gbCodes.h:620
	clockTicks = 2
	opcode = 126 '~'
	tempRegister = {B = {B0 = 96 '`', B1 = 195 '�'}, W = 50016}
	tempValue = 13 '\r'
	offset = 0 '\0'
#2  0x00000000004e7cc0 in Emulate (espec=0x7f712714e020) at gb.cpp:2097
	linedrawn = {true <repeats 58 times>, false <repeats 86 times>}
	clockTicks = 1
	doret = 0
#3  0x000000000041339f in MDFNI_Emulate (espec=0x7f712714e020) at mednafen.cpp:554
No locals.
#4  0x0000000000479783 in GameLoop (arg=0x0) at drivers/main.cpp:735
	espec = {pixels = 0x2493590, LineWidths = 0x248c790, IsFMV = 0x0, skip = 0, SoundBuf = 0x7f712714e058, SoundBufSize = 0x7f712714e06c, soundmultiplier = 1, NeedRewind = false, NeedSoundReverse = false}
	sound = (int16 *) 0xff1160
	ssize = 804
	fskip = 0
	ThisBackBuffer = 0
#5  0x00007f712f3bae47 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#6  0x00007f712f400369 in ?? () from /usr/lib/libSDL-1.2.so.0
No symbol table info available.
#7  0x00007f712f64b3ba in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#8  0x00007f712e770fcd in clone () from /lib/libc.so.6
No symbol table info available.
#9  0x0000000000000000 in ?? ()
No symbol table info available.