Segment fault when I select 464+ or 6128+ (Ubuntu 18.04)

[cpcbegin]

The emulator runs ok if I select CPC464, CPC664, CPC6128 & KC Compact but crash if I select 464+ or 6128+

I compile the emulator in Ubuntu 18.04 64 bits with these commands:

sudo apt install git build-essential libgtk2.0-dev libsdl1.2-dev libx11-dev
git clone https://github.com/rofl0r/arnold
cd arnold
git pull
cd src
./autogen.sh
./configure
make

[Chouzinho]

The same happens to me in Lubuntu 20.04. It works for cpc classic, but when I start the 6128 plus emulation, it crashes and gives a "segmentation fault"

[rofl0r]

thanks for the report. i suspect it is due to some undefined behavior exploited by newer gcc versions. you could try with an older gcc (for example if the binary is called gcc-6.4.0 run configure like CC=gcc-6.4.0 ./configure). also it would be interesting to see the warnings emitted by the gcc you use (run make >/dev/null 2>log.txt to get a file called log.txt containing all the warnings) so we can fix that.

[cpcbegin]

I change configure as you want and I get the same error. Now I'm trying with Ubuntu 20.04.

[rofl0r]

and, are there any warnings ? also each segfault report should be accompanied by a backtrace, produced by running the executable (optimally built with debug info) with gdb and typing bt when the segfault happens.

[rofl0r]

i just fixed the only crash that happened for me, but cpc+ setting seems to work fine.

[cpcbegin]

No, the emulator stop working as you can see in this short video.

[rofl0r]

ok, could you run gdb --args ./arnold instead, then hit "r" enter, wait for the crash, then type "bt" enter and show me the backtrace ?

[cpcbegin]

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Reading symbols from ./arnold...
(gdb) r
Starting program: /opt/linuxemus/arnoldrofl0r/src/arnold 
[Depuración de hilo usando libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Arnold Emulator (c) Kevin Thacker
Linux Port maintained by Andreas Micklei
----------------------------------------------------------
Compiled in ROMS:
  Amsdos    : 5559d010 to 555a1010, 1431666688 (0x55558000) bytes
  464   OS   : 555a1010 to 555a5010, 1431666688 (0x55558000) bytes
  464   Basic: 555a5010 to 555a9010, 1431666688 (0x55558000) bytes
  664   OS   : 555a9010 to 555ad010, 1431666688 (0x55558000) bytes
  664   Basic: 555ad010 to 555b1010, 1431666688 (0x55558000) bytes
  6128  OS   : 555b1010 to 555b5010, 1431666688 (0x55558000) bytes
  6128  Basic: 555b5010 to 555b9010, 1431666688 (0x55558000) bytes
  6128s OS   : 555b9010 to 555bd010, 1431666688 (0x55558000) bytes
  6128s Basic: 555bd010 to 555c1010, 1431666688 (0x55558000) bytes
  plus  Cart : 555c1010 to 555e1064, 1431781460 (0x55574054) bytes
  kcc   OS   : 555e1064 to 555e5064, 1431666688 (0x55558000) bytes
  kcc   Basic: 555e5064 to 555e9064, 1431666688 (0x55558000) bytes
----------------------------------------------------------
Opening /home/bobu/.arnold
Parsing /home/bobu/.arnold
tape: (null)
kbdtype: -1
[Nuevo Thread 0x7ffff19cd700 (LWP 5352)]
set_hwparams
Unable to set periods 2 for playback: Invalid argument
Setting of hwparams failed: Invalid argument
alsa_AudioPlaybackPossible(void): 0
/dev/dsp: No such file or directory
oss_AudioPlaybackPossible(void): 0
soundplugin: 0 (NONE)
Initializing SDL
[Nuevo Thread 0x7ffff11cc700 (LWP 5353)]
[Nuevo Thread 0x7fffdbfff700 (LWP 5354)]
[Thread 0x7fffdbfff700 (LWP 5354) terminado]
sdl_InitialiseKeyboardMapping(0)
Found 0 Joysticks
Initializing GTK+
[Nuevo Thread 0x7fffdbfff700 (LWP 5355)]
[Nuevo Thread 0x7fffdff36700 (LWP 5356)]
[Nuevo Thread 0x7fffdf735700 (LWP 5357)]
[Nuevo Thread 0x7fffdeee6700 (LWP 5358)]
Audio: 1
Joysticks: 1
Could not open /dev/console: Permiso denegado
Keyboard LED flashing will be disabled.
Opening window with resolution 384*272*0
BPP: 32
Red: M: 00ff0000 B: 8 S: 16
Green: M: 0000ff00 B: 8 S: 8
Blue: M: 000000ff B: 8 S: 0
Initialised CPC Emulation Core...
Initialised Audio...
Choose cpctype CPC 6128+ (5)

Thread 1 "arnold" received signal SIGSEGV, Segmentation fault.
0x0000555555578b43 in Z80_RD_OPCODE_BYTE (Offset=<optimized out>)
    at cpc/z80/z80.c:9782
9782    switch (Opcode)
(gdb) bt
#0  0x0000555555578b43 in Z80_RD_OPCODE_BYTE (Offset=<optimized out>)
    at cpc/z80/z80.c:9782
#1  Z80_ExecuteInstruction () at cpc/z80/z80.c:9780
#2  0x000055555556ae55 in Debugger_Execute () at cpc/debugger/gdebug.c:152
#3  0x0000555555559c05 in CPCEmulation_Run () at cpc/arnold.c:344
#4  0x0000555555586f51 in idlerun (data=<optimized out>) at unix/gtkui.c:820
#5  0x00007ffff7a0fe8e in g_main_context_dispatch ()
    at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007ffff7a10240 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007ffff7a10533 in g_main_loop_run ()
    at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007ffff7c82092 in gtk_main ()
    at /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#9  0x000055555558865b in gtkui_run () at unix/gtkui.c:859
#10 0x0000555555584d95 in init_main (argc=1, argv=0x7fffffffdff8)
    at unix/main.c:461
#11 0x0000555555559980 in main (argc=1, argv=0x7fffffffdff8) at unix/main.c:169
(gdb) 

[rofl0r]

thanks, the output was helpful. the issue was caused because your toolchain seems to default to create position-independent-executables (PIE). i was able to reproduce it and develop a fix.