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Bug 786

Summary: d-pad on playstation controller causes segfault in SDL games
Product: SDL Reporter: twilightinzero
Component: joystickAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED DUPLICATE QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2 CC: icculus
Version: 1.2.13Keywords: target-1.2.14
Hardware: x86   
OS: Linux   

Description twilightinzero 2009-08-29 20:19:09 UTC 
Hi. In all SDL applications that make use of the joystick, when I press any direction on the directional pad when the controller is in analog mode, the application quits with a segmentation fault.

When the controller is not in analog mode, the d-pad is mapped to axes 0 and 1 and it works correctly. When it is in analog mode, the left analog stick has axes 0 and 1, the right analog stick has axes 2 and 3, and the d-pad has axes 4 and 5. It doesn't matter if I switch to analog mode before starting the application, or while running the application.

I spent several hours working with a developer for FCE Ultra, and he narrowed it down to SDL's JoystickUpdate function. He could not assist me further, as he doesn't know SDL's internals.

Here is a backtrace of the problem occuring in FCE Ultra:

#0  0xb7dc671d in EV_HandleEvents () from /usr/lib/libSDL-1.2.so.0
#1  0xb7dc6cdd in SDL_SYS_JoystickUpdate () from /usr/lib/libSDL-1.2.so.0
#2  0xb7d9f5f0 in SDL_JoystickUpdate () from /usr/lib/libSDL-1.2.so.0
#3  0xb7d744de in SDL_PumpEvents () from /usr/lib/libSDL-1.2.so.0
#4  0xb7d749f7 in SDL_PollEvent () from /usr/lib/libSDL-1.2.so.0
#5  0x080d96a8 in FCEUD_UpdateInput () at src/drivers/sdl/input.cpp:720
#6  0x080e0fcb in DoFun (frameskip=0) at src/drivers/sdl/sdl.cpp:241
#7  0x080e2133 in main (argc=2, argv=0xbfb9c3e4) at src/drivers/sdl/sdl.cpp:732

lsusb identifies the controller adapter like so:

ID 0925:8866 Lakeview Research WiseGroup Ltd, MP-8866 Dual Joypad
Comment 1 Ryan C. Gordon 2009-09-13 16:33:31 UTC 
Tagging this bug with "target-1.2.14" so we can try to resolve it for SDL 1.2.14.

Please note that we may choose to resolve it as WONTFIX. This tag is largely so we have a comprehensive wishlist of bugs to examine for 1.2.14 (and so we can close bugs that we'll never fix, rather than have them live forever in Bugzilla).

--ryan.
Comment 2 Ryan C. Gordon 2009-09-27 22:33:07 UTC 
Taking bug.

--ryan.
Comment 3 Sam Lantinga 2009-09-27 23:58:10 UTC 
twilightzero, this bug is already reported and we've got some open troubleshooting steps in bug 575.  Can you take a look and see if you can add anything there?

Thanks!

*** This bug has been marked as a duplicate of bug 575 ***