(gdb) t a a bt

Thread 3 (Thread -1211090032 (LWP 6192)):
#0  0x00110402 in __kernel_vsyscall ()
#1  0x009045f1 in select () from /lib/libc.so.6
#2  0x00a00215 in ?? () from /usr/lib/libxcb.so.1
#3  0x00a01ed9 in xcb_wait_for_reply () from /usr/lib/libxcb.so.1
#4  0x00a5815d in _XReply () from /usr/lib/libX11.so.6
#5  0x00d5c18f in XRenderQueryFormats () from /usr/lib/libXrender.so.1
#6  0x00d5c95a in XRenderQueryVersion () from /usr/lib/libXrender.so.1
#7  0x00d71e01 in _XcursorGetDisplayInfo () from /usr/lib/libXcursor.so.1
#8  0x00d7220d in XcursorSupportsARGB () from /usr/lib/libXcursor.so.1
#9  0x00d7493c in XcursorNoticeCreateBitmap () from /usr/lib/libXcursor.so.1
#10 0x00a2e835 in _XNoticeCreateBitmap () from /usr/lib/libX11.so.6
#11 0x00a2ec4d in XCreatePixmap () from /usr/lib/libX11.so.6
#12 0x00a2daff in XCreateBitmapFromData () from /usr/lib/libX11.so.6
#13 0x0015e29a in pgm_glx_backend_create_window (backend=0x98f95e8)
    at pgmglxbackend.c:488
#14 0x0015bad9 in pgm_backend_create_window (backend=0x98f95e8)
    at pgmbackend.c:88
#15 0x0015a033 in render_loop (data=0x98f9000) at pgmcontext.c:961
#16 0x00b726df in ?? () from /lib/libglib-2.0.so.0
#17 0x009ca50b in start_thread () from /lib/libpthread.so.0
#18 0x0090bb2e in clone () from /lib/libc.so.6
---Type <return> to continue, or q <return> to quit---

Thread 2 (Thread -1270781040 (LWP 6193)):
#0  0x00110402 in __kernel_vsyscall ()
#1  0x00901ac3 in poll () from /lib/libc.so.6
#2  0x00b52583 in ?? () from /lib/libglib-2.0.so.0
#3  0x00b528f9 in g_main_loop_run () from /lib/libglib-2.0.so.0
#4  0x0015e8dd in event_loop (data=0x98f95e8) at pgmglxbackend.c:843
#5  0x00b726df in ?? () from /lib/libglib-2.0.so.0
#6  0x009ca50b in start_thread () from /lib/libpthread.so.0
#7  0x0090bb2e in clone () from /lib/libc.so.6

Thread 1 (Thread -1208990016 (LWP 6159)):
#0  0x00110402 in __kernel_vsyscall ()
#1  0x009ce5d5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#2  0x001596dc in pgm_context_new (glviewport=0x98f50c0) at pgmcontext.c:1141
#3  0x00162d12 in pgm_gl_viewport_init (glviewport=0x98f50c0)
    at pgmglviewport.c:1067
#4  0x00ce415a in g_type_create_instance () from /lib/libgobject-2.0.so.0
#5  0x00ccb1a2 in ?? () from /lib/libgobject-2.0.so.0
#6  0x00cc93eb in g_object_newv () from /lib/libgobject-2.0.so.0
#7  0x00cc9f8e in g_object_new_valist () from /lib/libgobject-2.0.so.0
#8  0x00cca140 in g_object_new () from /lib/libgobject-2.0.so.0
#9  0x001603cc in pgm_gl_viewport_new () at pgmglviewport.c:1077
---Type <return> to continue, or q <return> to quit---
#10 0x0012311f in pgm_viewport_factory_create (factory=0x9836c60, 
    viewport=0xbffb9b14) at ./pgmviewportfactory.c:448
#11 0x08048bf0 in main (argc=Cannot access memory at address 0x80
) at text.c:75
#0  0x00110402 in __kernel_vsyscall ()
(gdb)