berusky2: Segfault in XSync on exit

[apoleon]

Hi!

This is Debian bug http://bugs.debian.org/722639

At some point when existing the game it crashes with a segmentation fault.

The backtrace for that core dump is:

Core was generated by `berusky2'.
Program terminated with signal 11, Segmentation fault.
#0 XSync (dpy=0x0, discard=discard@entry=0) at ../../src/Sync.c:42

42 ../../src/Sync.c: No such file or directory.
(gdb) bt full
#0 XSync (dpy=0x0, discard=discard@entry=0) at ../../src/Sync.c:42

    rep = {type = 168 '\250', revertTo = 149 '\225', 
      sequenceNumber = 31744, length = 32546, focus = 2087582160, 
      pad1 = 32546, pad2 = 0, pad3 = 0, pad4 = 0, pad5 = 0}

#1 0x00007f227c044478 in X11_VideoQuit (this=0x1bb5dc0)

at ../../src/video/x11/SDL_x11video.c:1491

No locals.
#2 0x00007f227c036c3e in SDL_VideoQuit () at ../../src/video/SDL_video.c:1365

    video = 0x1bb5dc0
    this = 0x1bb5dc0
    ready_to_go = <optimized out>

#3 0x00007f227c0111d5 in SDL_QuitSubSystem (flags=flags@entry=65535)

at ../../src/SDL.c:196

No locals.
#4 0x00007f227c01127e in SDL_Quit () at ../../src/SDL.c:222

No locals.
#5 0x00007f227c0118bf in SDL_Parachute (sig=11) at ../../src/SDL_fatal.c:41

No locals.
#6

No locals.
#7 0x000000000055957c in ?? ()

No symbol table info available.
#8 0x00007f227ad57e0e in start_thread (arg=0x7f226ecf6700)

at pthread_create.c:311
    __res = <optimized out>
    pd = 0x7f226ecf6700
    now = <optimized out>
    unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139785864701696, 
            -124161288581994295, 0, 139786066463968, 4096, 
            139785864701696, 631574938200265, 587541738236105}, 
          mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, 
        data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
    not_first_call = 0
    pagesize_m1 = <optimized out>
    sp = <optimized out>
    freesize = <optimized out>
    __PRETTY_FUNCTION__ = "start_thread"

#9 0x00007f227a27593d in clone ()

at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

No locals.

This segfault might be related to some kind of threading issue. See also the next bug report about the "Abort in XCB code".

[stransky]

It's a segfault in the tread code, handled by SDL_Parachute(). The rest (Xsync failure) is just a follow up failure. The core will abort/crash even when XInitThreads() is called.