[Qt-interest] UI Interaction Freezing when using QGraphicsView - How to Debug?

[Josiah Bryan]

Josiah Bryan wrote:
...
> Its a rather extreem freeze - in fact, even the system mouse freezes 
> (under gdb, when not running in gdb, mouse doesn't freeze but unrelated 
> apps still do, like the charts in gkrellm.)
...

Alright, it took 4+ hours, but I narrowed it down to the attached test 
case.

To reproduce:

- Build and run
- Attempt to drag any rectangle, even by a small amount.
- Repeat until system becomes unresponsive (mouse freezes, other 
programs freeze.)

On my system (specs below), the program freezes within 1 - 5 mouse 
interactions (drags.) This is with the both cores hovering around 5 - 
10% load before mouse interaction following program launch. RAM is 
around 1.5GB free at time of tests, disk usage minimal (~64K/sec xfer 
load.) No other graphic intensive programs running - email, terminals, 
KWrite, etc. No other opengl programs (that I know of) - certainly no 3D 
programs.

System info:

Running with 4GB RAM on an Intel(R) Core(TM)2 Duo CPU, both cores 
running at 3.00GHz. Graphics card is a Quadro NVS 290 (PCIe card) with 
256 MB RAM.

X -version reports:

X Window System Version 1.3.0
Release Date: 19 April 2007
X Protocol Version 11, Revision 0, Release 1.3
Build Operating System: Fedora Core 7 Red Hat, Inc.
Current Operating System: Linux josiah-desktop.pci.local 2.6.23.9-85.fc8 
#1 SMP Fri Dec 7 15:49:59 EST 2007 i686
Build Date: 17 October 2007
Build ID: xorg-x11-server 1.3.0.0-33.fc8

NVidia control center reports under "OpenGL/GLX Information", heading 
"Server GLX Information", that the vendor is NVIDIA, version 1.4, with 
the following extensions:

GLX_EXT_visual_info
GLX_EXT_visual_rating
GLX_SGIX_fbconfig
GLX_SGIX_pbuffer
GLX_SGI_video_sync
GLX_SGI_swap_control
GLX_EXT_texture_from_pixmap
GLX_ARB_multisample
GLX_NV_float_buffer
GLX_ARB_fbconfig_float
GLX_EXT_framebuffer_sRGB


Tested on XP - not able to reproduce there. No other linux machines 
tested yet. Will test my home system this evening (CentOS 5.2, dual 
head, etc.)

Anyone able to reproduce or offer tips on fixing? Anyone at trolltech 
able to comment?

Thanks in advance.
-josiah


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