[SOLVED] Eclipse with EPIC causing Segmentation fault running a simple Perl script

FrancisG · 08-12-2014, 11:26 AM

I am running Arch Linux using Xfce desktop.
I have tried the following script in Eclipse Keplar and Lunar with EPIC 0.5 and 0.6, but the same result.

Code:

#!/usr/bin/perl
use strict;
use warnings;
use DateTime;
DateTime->DefaultLocale("UTC");
my $dt0 = DateTime->now();
my $dateHour = $dt0->hour();
print $dateHour;
print "End\n";

If I run it in a terminal I just get a message 'Segmentation Fault'
If I comment out the DateTime lines, then it prints 'End' correctly

If I try and run it in the Debugger with DateTime lines commented out I get an error message:

An internal error occurred during: "Launching Test.pl".
java.lang.NullPointerException

and the log shows:

Code:

!SESSION 2014-08-12 16:10:14.453 -----------------------------------------------
eclipse.buildId=4.3.0.M20130911-1000
java.version=1.7.0_65
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_GB
Framework arguments:  -product org.eclipse.epp.package.java.product
Command-line arguments:  -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.java.product

!ENTRY org.eclipse.core.jobs 4 2 2014-08-12 16:11:50.113
!MESSAGE An internal error occurred during: "child count update".
!STACK 0
java.lang.NullPointerException
	at org.epic.debug.db.StackFrame.readTopFrameVars(StackFrame.java:397)
	at org.epic.debug.db.StackFrame.getVariables(StackFrame.java:226)
	at org.eclipse.debug.internal.ui.model.elements.StackFrameContentProvider.getAllChildren(StackFrameContentProvider.java:51)
	at org.eclipse.debug.internal.ui.model.elements.StackFrameContentProvider.getChildCount(StackFrameContentProvider.java:28)
	at org.eclipse.debug.internal.ui.model.elements.ElementContentProvider.retrieveChildCount(ElementContentProvider.java:114)
	at org.eclipse.debug.internal.ui.model.elements.ElementContentProvider$2.run(ElementContentProvider.java:63)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)

I have updated all my Perl modules (yes the DateTime module is installed!)
I have not been able to find any useful info on the EPIC forum or by searching the web.
Any ideas?

FrancisG · 08-12-2014, 01:15 PM

In answer to myself I think it is probably a Path Issue of some sort.
If I try this script:

Code:

#!/usr/bin/perl
use strict;
use warnings;
print "Check PadWalker Version";
require PadWalker;
print eval { PadWalker->VERSION};

I get 'Segmentation fault', so it is not finding any of the modules.
I have tried adding these paths to the project

Code:

/usr/lib/perl5/site_perl
/usr/share/perl5/site_perl
/usr/lib/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib/perl5/core_perl
/usr/share/perl5/core_perl

and

Code:

$PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl
$PERL5LIB=/usr/lib/perl5/site_perl:/usr/share/perl5/site_perl:/usr/lib/perl5/vendor_perl:/usr/share/perl5/vendor_perl:/usr/lib/perl5/core_perl:/usr/share/perl5/core_perl

I have installed perl-padwalker and perl-datetime and still no good. The PadWalker.pm is in /usr/lib/perl5/vendor_perl and /usr/lib/perl5/site_perl so they are definately in the path.
Very odd.

FrancisG · 08-13-2014, 02:08 AM

It turned out to be a CPAN problem in the end.
I cleared the .cpan folder
reran the cpan configuration
then ran the command in the cpan environment

Code:

recompile

as suggested by Perl Monks for another Segmentation fault problem
and everything works perfectly again.
Phew!