(gdb) bt
#0  0xf7ffcdb9 in __kernel_vsyscall ()
#1  0xf75f0616 in raise () from /lib/i386-linux-gnu/libc.so.6
#2  0xf75d83f7 in abort () from /lib/i386-linux-gnu/libc.so.6
#3  0xf763538c in ?? () from /lib/i386-linux-gnu/libc.so.6
#4  0xf763d70f in ?? () from /lib/i386-linux-gnu/libc.so.6
#5  0xf763f077 in ?? () from /lib/i386-linux-gnu/libc.so.6
#6  0xf65572cd in ?? () from /usr/lib/i386-linux-gnu/libxcb.so.1
#7  0xf6554bee in ?? () from /usr/lib/i386-linux-gnu/libxcb.so.1
#8  0xf6555149 in ?? () from /usr/lib/i386-linux-gnu/libxcb.so.1
#9  0xf6555203 in xcb_writev () from /usr/lib/i386-linux-gnu/libxcb.so.1
#10 0xf65b0071 in _XSend () from /usr/lib/i386-linux-gnu/libX11.so.6
#11 0xf65a5dc9 in XQueryExtension () from /usr/lib/i386-linux-gnu/libX11.so.6
#12 0xf65998d0 in XInitExtension () from /usr/lib/i386-linux-gnu/libX11.so.6
#13 0xf66d4627 in XRenderFindDisplay () from /usr/lib/i386-linux-gnu/libXrender.so.1
#14 0xf66d4948 in XRenderQueryExtension () from /usr/lib/i386-linux-gnu/libXrender.so.1
#15 0xf66ddf67 in _XcursorGetDisplayInfo () from /usr/lib/i386-linux-gnu/libXcursor.so.1
#16 0xf66de4ac in XcursorSupportsARGB () from /usr/lib/i386-linux-gnu/libXcursor.so.1
#17 0xf66e11c3 in XcursorNoticeCreateBitmap () from /usr/lib/i386-linux-gnu/libXcursor.so.1
#18 0x082bac0f in XCreatePixmap ()
#19 0x082b9e0a in XCreateBitmapFromData ()
#20 0x082b786f in X11_CreateEmptyCursor () at /mnt/data2/SDL2-2.0.10/src/video/x11/SDL_x11mouse.c:53
#21 X11_ShowCursor (cursor=0x0) at /mnt/data2/SDL2-2.0.10/src/video/x11/SDL_x11mouse.c:288
#22 0x081feb44 in SDL_SetCursor_REAL (cursor=<optimized out>) at /mnt/data2/SDL2-2.0.10/src/events/SDL_mouse.c:1046
#23 SDL_SetRelativeMouseMode_REAL (enabled=SDL_TRUE) at /mnt/data2/SDL2-2.0.10/src/events/SDL_mouse.c:847
#24 0x08146dd9 in IN_ToggleClientMouse (newstate=1, oldstate=2) at ../engine/client/input.c:211
#25 0x08149654 in Key_SetKeyDest (key_dest=1) at ../engine/client/keys.c:828
#26 0x0810f331 in UI_SetActiveMenu (fActive=false) at ../engine/client/cl_gameui.c:80
#27 0x08128a1a in SCR_BeginLoadingPlaque (is_background=false) at ../engine/client/cl_scrn.c:353
#28 0x08068f1e in Host_RunFrame (time=0.0112613803) at ../engine/common/host_state.c:152
#29 COM_Frame (time=0.0112613803) at ../engine/common/host_state.c:194
#30 0x080687d2 in Host_Main (argc=3, argv=0xffffd074, progname=0x83e3b5d "valve", bChangeGame=0, func=0x807e2f0 <Launcher_ChangeGame>) at ../engine/common/host.c:1039
#31 0x080490bf in main (argc=3, argv=0xffffd074) at ../engine/common/launcher.c:106