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Bug 1648

Summary: repeatable crash from ToME4, Linux, Intel integrated graphics
Product: SDL Reporter: Greg Wooledge <wooledg-libsdl>
Component: *don't know*Assignee: Ryan C. Gordon <icculus>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2    
Version: HG 2.0   
Hardware: x86   
OS: Linux   
URL: http://forums.te4.org/viewtopic.php?f=42&t=35276

Description Greg Wooledge 2012-11-27 13:23:44 UTC 
The game ToME4 (http://www.te4.org/) uses SDL2/HG and crashes repeatably on some computers, but not others.  The corresponding bug on the game's bug-tracking forum is http://forums.te4.org/viewtopic.php?f=42&t=35276 and contains some information which I'll also repeat here.

Debian 6.0, i386.  SDL version 6710:e650705e2c1d tip

The game also uses SDL_image and SDL_ttf.

The crash is accompanied by this text on the terminal window from which it was launched:
*** glibc detected *** ./t-engine: free(): invalid next size (fast): 0xa8ce9748 ***
(along with a stack trace)

Running the game under gdb, here's a slightly more useful trace at the time of the crash:

(gdb) where
#0  0xb7fe2424 in __kernel_vsyscall ()
#1  0xb7c01781 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb7c04bb2 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb7c37e75 in ?? () from /lib/i686/cmov/libc.so.6
#4  0xb7c41f71 in ?? () from /lib/i686/cmov/libc.so.6
#5  0xb7c437c8 in ?? () from /lib/i686/cmov/libc.so.6
#6  0xb7c468ad in free () from /lib/i686/cmov/libc.so.6
#7  0xb7a31dfd in XFree () from /usr/lib/libX11.so.6
#8  0xb7a31e4c in _XFreeEventCookies () from /usr/lib/libX11.so.6
#9  0xb7a2124d in XNextEvent () from /usr/lib/libX11.so.6
#10 0xb7f6f8f5 in XNextEvent (a=0x820bcb8, b=0xbffff888)
    at ../SDL/src/video/x11/SDL_x11sym.h:88
#11 0xb7f7e6fe in X11_DispatchEvent (_this=0x820b5e0)
    at ../SDL/src/video/x11/SDL_x11events.c:165
#12 X11_PumpEvents (_this=0x820b5e0)
    at ../SDL/src/video/x11/SDL_x11events.c:697
#13 0xb7efd2a4 in SDL_PumpEvents () at ../SDL/src/events/SDL_events.c:310
#14 0xb7efd7da in SDL_WaitEventTimeout (event=0xbffffa04, timeout=0)
    at ../SDL/src/events/SDL_events.c:343
#15 0xb7efd8b5 in SDL_PollEvent (event=0xbffffa04)
    at ../SDL/src/events/SDL_events.c:325
#16 0x08050e5d in main (argc=1, argv=0xbffffb14) at ../src/main.c:1083

The graphics hardware, from lspci -nn:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e12] (rev 03)
00:02.1 Display controller [0380]: Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e13] (rev 03)

Unfortunately I do not have a simple test case that can reproduce the crash.  I only know how to do it by launching and playing the game.
Comment 1 Sam Lantinga 2012-11-27 20:37:29 UTC 
Crashes in free() and malloc() tend to be memory corruption in your application.  Valgrind under Linux is a great way to find memory corruption problems.

Cheers!