[LON-CAPA-admin] using random labels on gifs

[Todd Ruskell]

Guy,

I am finally having some time again to look more closely at our
non-displaying random-label figures.

When I look at the problem located at:
http://loncapa.mines.edu/priv/csmphyslib/type54_potential/EquipotentialContours.problem

as a co-author, this is what I see in the logs.

in /var/log/httpd/error_log:
[Thu Sep 25 11:07:24 2003] [notice] child pid 21740 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:24 2003] [notice] child pid 21739 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21744 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21743 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21742 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21741 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21738 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21737 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21736 exit signal
Segmentation fault (11)
[Thu Sep 25 11:07:25 2003] [notice] child pid 21735 exit signal
Segmentation fault (11)
 

in /home/httpd/perl/logs/lonnet.log:
Thu Sep 25 11:07:24 2003 (21738): Subscribe returned not_found:
/home/httpd/html/res/home/csmphyslib/public_html/type54_potential/EquipotentialContours.problem.meta

For every access, I seem to get the 10 seg faults, and one "meta file
not found".  

The really funny thing is that the pdf file, complete with figure, is
generated just fine.  We had some issues with gnuplot on our first
install.  I don't know if you use gnuplot for the random labels or not,
but if so, that may be a first clue.

I get the same behaviour with other random label problems:
http://loncapa.mines.edu/priv/csmphyslib/type55_potential/EquipotentialLines.problem

I noticed that I also get the "meta file not found" error, but not the
seg-faulted processes with these problems, even though they are not
random label problems, and one of them contains no graph at all.
http://loncapa.mines.edu/priv/csmphyslib/type55_potential/RadialElectField.problem
http://loncapa.mines.edu/priv/csmphyslib/type55_potential/SymmetricCross.problem
http://loncapa.mines.edu/priv/csmphyslib/type55_potential/SphericalInsulatingShell.problem

I have included all of the above problems in a course called "Test
Course".  When I access the problems as either course coordinator or
student, I no longer seem to get the "meta file not found" error, but I
still get the 10 lines of seg fault in the error_log file, for the
random-label problems.

Occasionally, the gif will show up properly the first time it is viewed,
but upon a reload, it disappears.  Students can still print the proper
image just fine.

I have added albertel:msu to the course as both student and instructor
if that will help.

Thanks for you help.  We seem to be giving you a fair number of
challenges.


Todd


On Wed, 2003-08-06 at 11:03, Guy Albertelli II wrote:
> Hi Craig,
> 
> 
> >     We have run into a problem with using random labels on gif images in 
> > course problems. 
> 
> 
> Are there any error messages in 
> 
> /var/log/httpd/error_log
> /home/httpd/perl/logs/lonnet.log
> 
> That seem relavent?
> 
>