Re: [bug-gawk] : in debug mode, every eval causes double free of memory

[Jan Chaloupka]

Hi,

it is up-to date version from repo, i.e. gawk-4.1.1.tar.xz . Also tested 
on the latest source codes from git from 2014-05-05 16:50:23, hash 
bce72232ae0d79d8af6b5aa1986b78c04d6c7c28 . Crash occurs again.

Have you tried to run it with valgrind? This does not occur on all 
systems, as glibc does not have to be so strict about double frees.

Jan

On 05/06/2014 09:04 PM, Aharon Robbins wrote:
> Hi. Thanks for this report.
>
> > Date: Tue, 06 May 2014 15:44:36 +0200
> > From: Jan Chaloupka <address@hidden>
> > To: address@hidden
> > Subject: [bug-gawk] : in debug mode, every eval causes double free of memory
> >
> > Hi,
> >
> > every time a gawk is started in debug mode, eval command is run
> > correctly, but then double free of memory occurs. Occurs on Fedora 20.
> >
> > Steps to reproduce:
> >
> > 1) gawk -f /tmp/emptygawk.awk --debug
> > 2) type eval ""
> >
> > /tmp/emptygawk.awk is empty file.
> >
> > Reported in https://bugzilla.redhat.com/show_bug.cgi?id=1089073.
> >
> > I've been able to trace the problem to debug.c:5567 and debug.c:5569.
> > free_context frees memory. destroy_symbol then frees it for the second
> > time. But why it is happening, it requires deeper knowledge of the
> > source code.
> >
> > Regards
> > Jan
> You don't state which version of gawk you're using. The bugzilla looks
> like it's based on 4.1.0. I cannot reproduce this problem using 4.1.1
> on my 64 bit Ubuntu 12.04 system.
>
> I don't have access to a Fedora 20 system.
>
> Can you please try with either the released 4.1.1 code or the
> gawk-4.1-stable branch in the git repo from Savannah?
>
> Thanks,
>
> Arnold

--
Jan Chaloupka
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