Re: [Denemo-devel] Denemo sporadic crash on startup.

[Richard Shann]

I am fairly sure this started about May 5th, but unfortunately the
commits about this time make denemo un-compilable, so it is difficult to
test.
My suspicion is that it is this change:

commit b56cad8dba8df69afcdf5d32afd1c665d011d3b9
added an external program to generate commands.c

I think it causes a memory corruption which then shows itself in
unpredictable ways.

Richard


On Wed, 2013-05-15 at 17:21 +0100, Richard Shann wrote:
> I have noticed a crash that occurs occasionally on start up.
> I have devised the following script
> 
> echo "COUNTER is " $1 && ./denemo -a "(d-Quit)" && COUNTER=$1 && let 
> COUNTER=COUNTER+1 &&  [ $COUNTER -le 500 ] && run_forever.sh $COUNTER fi
> 
> You need to have this in the path, and to have the version of denemo you
> are testing in the cwd.
> 
> This runs Denemo up to 500 times. Run on recent versions of Denemo it
> crashes after a certain number of iterations (I have seen it last for
> 216, other times just a few dozen or less).
> 
> The crash is either a segmentation fault, or sometimes an exit by the
> memory allocator complaining of corruption. The call stack in this case
> goes back to a scheme error callback.
> 
> I have run the test on the latest release without it crashing (I had no
> limit, and it got up between 600 and 1000 iterations and then my O/S
> seized up - I was running the system monitor and it showed swap starting
> to get used up, then most everything froze and I lost control over mouse
> and keyboard - disk activity was continuing and I forced a shut down
> after a while).
> 
> With it happening so rarely this will be difficult to pin down to a
> particular check-in. I think it goes back a couple of weeks or so at
> least.
> 
> If anyone cares to run the test please let me know what you find - I am
> running gtk2 and guile-1.8.7
> 
> Richard
> 
> 
> 
> 
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