[gecode-users] Bugs in Gecode/J

[Mikael Zayenz Lagerkvist]

Hi,

I did have a look at your most recent crashes, and I'm not sure where
the problem is exactly. I cannot reproduce them on my machine.

Since the crashes are random, my guess is that the problem might come
from the fact that you are running on a multi-core machine (as seen in
the hs_err_pid log). The problem might be that the Java-C++ interface
does not work correctly under concurrent garbage-collection. However,
this is just a guess.

We will definitely look into these crashes more carefully in the
future, but I don't have any hope of finding the problem soon.

Cheers,
Mikael

On Mon, Apr 21, 2008 at 2:48 AM, Malcolm Ryan <malcolmr at cse.unsw.edu.au> wrote:
> I don't mean to hassle you, but I just need to know whether you think
>  you can help me with this problem. I am working towards a close paper
>  deadline and I need to know whether to stick with Gecode/J in the hope
>  that we will be able to sort out these problems, or whether I need to
>  look for another solution.
>
>  Thanks,
>
>  Malcolm
>
>
>
>  On 16/04/2008, at 9:37 PM, Malcolm Ryan wrote:
>
>  > I've moved everything over to one of our Linux boxes and the
>  > problems have changed. I'm now using the following java:
>  >
>  > java version "1.6.0_04"
>  > Java(TM) SE Runtime Environment (build 1.6.0_04-b12)
>  > Java HotSpot(TM) Server VM (build 10.0-b19, mixed mode)
>  >
>  > I'm getting intermittent crashes with the message:
>  >
>  > #
>  > # An unexpected error has been detected by Java Runtime Environment:
>  > #
>  > #  SIGSEGV (0xb) at pc=0x2f605c9f, pid=13779, tid=3084274576
>  > #
>  > # Java VM: Java HotSpot(TM) Server VM (10.0-b19 mixed mode linux-x86)
>  > # Problematic frame:
>  > # C  [libgecodesearch.so.12+0x1c9f]  _ZN6Gecode6Search3DFS4nextEv
>  > +0x2af
>  > #
>  > # An error report file with more information is saved as:
>  > # /tmp_amd/adams/import/1/malcolmr/exps/aiide08/hs_err_pid13779.log
>  > #
>  > # If you would like to submit a bug report, please visit:
>  > #   http://java.sun.com/webapps/bugreport/crash.jsp
>  > # The crash happened outside the Java Virtual Machine in native code.
>  > # See problematic frame for where to report the bug.
>  > #
>  >
>  > I've attached the hs_err_pid*.log file. If you want to try it
>  > yourself, there is a new jar file at:
>  > http://www.cse.unsw.edu.au/~malcolmr/aiide08.jar.
>  > I've made it automatically run one of the problematic experiments.
>  > So all you need to do is:
>  > jar -xf aiide08.jar Maps
>  > java -cp aiide08.jar -Xmx2G exps.PatricksExperiment
>  >
>  > Sometimes it runs fine. Sometimes it crashes. You may need to try it
>  > 10 times or so.
>  >
>  > Malcolm
>  >
>  >
>  > <hs_err_pid13779.log>
>
>
> >
>  >
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>
>
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-- 
Mikael Zayenz Lagerkvist, http://www.ict.kth.se/~zayenz/