hugin-devs team mailing list archive

[Bernd Kreuss <792896@xxxxxxxxxxxxxxxxxx>]

Ok, here is some more information.

I removed the nightly and instead added the official  hugin/next
repository from launchpad. Everything that I write now refers to this
version. To retrieve the backtrace I did the following:

$ sudo apt-get build-dep hugin
$ apt-get source hugin

$ cd hugin-2012.0.0~beta1+dfsg
$ geany debian/rules 
and comment the line dh_strip around line 162 to build it with debugging symbols

$ dpkg-buildpackage -us -uc -nc
Build it and create .deb packages

$ sudo dpkg -i ../hugin*.deb
Install them

$ gdb hugin
(gdb) run

provole the crash (just open the fast preview and if it does not yert
crash on its own then enable the Overview, this will surely crash it)

(gdb) backtrace
Program received signal SIGSEGV, Segmentation fault.
0x00000000 in ?? ()
(gdb) backtrace
#0  0x00000000 in ?? ()
#1  0x081e91ac in OverviewOutlinesTool::draw (this=0x8c198a8)
    at /home/bernd/hugin-2012.0.0~beta1+dfsg/src/hugin1/hugin/OverviewOutlinesTool.cpp:194
#2  0x081e348b in PanosphereOverviewToolHelper::AfterDrawImagesBack (this=0x91d6e10)
    at /home/bernd/hugin-2012.0.0~beta1+dfsg/src/hugin1/hugin/ToolHelper.cpp:706
#3  0x081876e9 in GLPanosphereOverviewRenderer::Redraw (this=0x8ffe7c0)
    at /home/bernd/hugin-2012.0.0~beta1+dfsg/src/hugin1/hugin/GLRenderer.cpp:312

OverviewOutlinesTool.cpp:194 looks like this:

    glBlendEquation(GL_FUNC_ADD);

comment it (because GL_FUNC_ADD is the default anyways)

    // glBlendEquation(GL_FUNC_ADD);

now I built the package with this modification (I have no idea how to
convince dpkg-buildpackage to just recompile what was modified, I can
either clean everything with -Tclean and rebuild from scratch or it
won't compile anything at all, probably just a file I would need to
touch but I don't know which one)

The patched version works like a charm, it will not crash and I can even
*use* the Overview globe (which I have seen for the first time today and
which is a very nice feature), everything is working perfectly well!

Developers: I can reproduce the crash everytime and I have now set up
the environment to build from source (based on this launchpad source
package) and If you want me to insert debugging code to catch this
exception and log various stuff of interest on my system to investigate
what exactly is going on then please tell me, send me a patch (post it
here) and I will apply and test and report back.

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https://bugs.launchpad.net/bugs/792896

Title:
  Fast Preview Hangs or Crashes since 2011.0

Status in Hugin - Panorama Tools GUI:
  Fix Released

Bug description:
  EDIT (August 6, 2011): summarized known information

  *WORKAROUND FOR USERS*: disable the Overview

  1- start Hugin
  2- load a project
  3- go to the Fast Preview Window.  don't touch anything else but described below as this could trigger the bug
  4- hit the button Show/Hide to hide the Overview
  5- quit Hugin
  Now Hugin should perform well.

  
  *AFFECTED SYSTEMS*

  - CPU: all systems with more than one thread, that is multi-core CPUs as well as single-core CPUs with hyperthreading.
  - Operating Systems: due to the different implementations of threading and OpenGL on different platform, some systems are more prone to error than others.  Mac OS X seems to be the least affected.  Windows seems to be the most affected.

  
  *AFFECTED VERSIONS*

  - All versions of Hugin since the introduction of the Overview in the Fast Preview are affected.  That is, all versions after revision 4808:8c577b320714 2011-01-09 12:21:18
  - This includes the final releases of 2011.0.0 as well as all beta/candidate releases of 2011.2.0

  
  *SUMMARY FOR DEVELOPERS / BUG HUNTERS*

  This is most likely a threading issue. Lukáš' hypothesis: "a race
  condition in OpenGL calls, when OGL is called by separate threads from
  both overview and fast preview. The reason is that OpenGL is not
  thread-safe and it can cause various problems when used within multi-
  threaded application."

  Run 'valgrind --tool=helgrind hugin' and try to reproduce the error to
  produce a useful backtrace like
  https://bugs.launchpad.net/hugin/+bug/792896/+attachment/2253077/+files
  /valgrind-out.txt

  
  *ORIGINAL BUG REPORT BELOW FOR COMPLETION:*

  Upgraded from 2010.4 to 2011.0.0 and it has hung 3 times in about 15
  sessions.  All three hangs happened while doing the same thing.....
  new session, load images, load a lens profile, set the canvas size
  (Calculate optimal size), save-as and save profile then click on GL
  (fast preview) button.  Fast preview window comes up, shows anchor
  image and then hangs.

  Is not reproducible.  Running 2011.0.0.0fd3e119979c built by Matthew
  Petroff on 64-bit Win7.

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