(gdb) br QEgl::hasExtension
Function "QEgl::hasExtension" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 2 (QEgl::hasExtension) pending.
(gdb) run
Starting program: /usr/lib/qt4/examples/opengl/textures/textures
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
[New Thread 0xb42b7420 (LWP 3004)]
[New Thread 0xb38ff420 (LWP 3005)]
[New Thread 0xb2eff420 (LWP 3006)]
PVR:(Warning): PVRSRVOpenDCDevice: Warning - 138 returned [95, /bridged_pvr_dc_glue.c]

Breakpoint 2, 0xb6df7ef2 in QEgl::hasExtension(char const*) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
(gdb) s
Single stepping until exit from function _ZN4QEgl12hasExtensionEPKc,
which has no line number information.
[Thread 0xb2eff420 (LWP 3006) exited]
0xb6df7ffc in QEgl::display() () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
(gdb) bt
#0  0xb6df7ffc in QEgl::display() () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#1  0xb6df9524 in QEgl::chooseConfig(QEglProperties const*, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#2  0xb6df9b38 in QEglContext::chooseConfig(QEglProperties const&, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#3  0xb6fb3a1a in QGLContext::chooseContext(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#4  0xb6f8798e in QGLContext::create(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#5  0xb6fb3bf0 in QGLWidget::setContext(QGLContext*, QGLContext const*, bool) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#6  0xb6f87026 in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#7  0xb6f87026 in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) s
Single stepping until exit from function _ZN4QEgl7displayEv,
which has no line number information.

Breakpoint 2, 0xb6df7ef2 in QEgl::hasExtension(char const*) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
(gdb) bt
#0  0xb6df7ef2 in QEgl::hasExtension(char const*) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#1  0xb6df801e in QEgl::display() () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#2  0xb6df9524 in QEgl::chooseConfig(QEglProperties const*, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#3  0xb6df9b38 in QEglContext::chooseConfig(QEglProperties const&, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#4  0xb6fb3a1a in QGLContext::chooseContext(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#5  0xb6f8798e in QGLContext::create(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#6  0xb6fb3bf0 in QGLWidget::setContext(QGLContext*, QGLContext const*, bool) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#7  0xb6f87026 in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#8  0xb6f87026 in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) s
Single stepping until exit from function _ZN4QEgl12hasExtensionEPKc,
which has no line number information.
0xb6df801e in QEgl::display() () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
(gdb) s
Single stepping until exit from function _ZN4QEgl7displayEv,
which has no line number information.
0xb6df9524 in QEgl::chooseConfig(QEglProperties const*, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
(gdb)
Single stepping until exit from function _ZN4QEgl12chooseConfigEPK14QEglPropertiesNS_16PixelFormatMatchE,
which has no line number information.
0xb6df9b38 in QEglContext::chooseConfig(QEglProperties const&, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
(gdb) bt
#0  0xb6df9b38 in QEglContext::chooseConfig(QEglProperties const&, QEgl::PixelFormatMatch) () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
#1  0xb6fb3a1a in QGLContext::chooseContext(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#2  0xb6f8798e in QGLContext::create(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#3  0xb6fb3bf0 in QGLWidget::setContext(QGLContext*, QGLContext const*, bool) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#4  0xb6f87026 in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#5  0xb6f87026 in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) s
Single stepping until exit from function _ZN11QEglContext12chooseConfigERK14QEglPropertiesN4QEgl16PixelFormatMatchE,
which has no line number information.
0xb6fb3a1a in QGLContext::chooseContext(QGLContext const*) () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
(gdb) s
Single stepping until exit from function _ZN10QGLContext13chooseContextEPKS_,
which has no line number information.
Warning:
Cannot insert breakpoint 0.
Error accessing memory address 0x0: Input/output error.

0xb6fb4e7c in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
(gdb) bt
#0  0xb6fb4e7c in ?? () from /usr/lib/arm-linux-gnueabihf/libQtOpenGL.so.4
#1  0x00000000 in ?? ()
(gdb) (gdb) (gdb) ~~~~~which has no line number information.
Undefined command: "".  Try "help".
(gdb) 0xb6df801e in QEgl::display() () from /usr/lib/arm-linux-gnueabihf/libQtGui.so.4
Undefined command: "0xb6df801e".  Try "help".
(gdb) (gdb) list
Undefined command: "".  Try "help".
(gdb) No symbol table is loaded.  Use the "file" command.
(gdb) (gdb) s
Undefined command: "".  Try "help".
(gdb) Single stepping until exit from function _ZN4QEgl7displayEv,
Undefined command: "Single".  Try "help".
(gdb) s
Cannot find bounds of current function