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Perl aborts with panic: POPSTACK #901

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p5pRT opened this issue Nov 29, 1999 · 2 comments
Closed

Perl aborts with panic: POPSTACK #901

p5pRT opened this issue Nov 29, 1999 · 2 comments

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@p5pRT
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p5pRT commented Nov 29, 1999

Migrated from rt.perl.org#1835 (status was 'resolved')

Searchable as RT1835$

@p5pRT
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p5pRT commented Nov 29, 1999

From zinie@cs.unibo.it

I'm developing an administration suite written in Perl, and in just another
cycle of run/stare at the error/patch, the error was 'panic​: POPSTACK'; as the
Guide suggests, I choose not to panic but to report this as a bug.

I include uuencoded (because I don't know if perlbug is going to ask me about
files to include as attachments), the minimum subset of code to reproduce the
error; the code contained in the file has no license in it yet, but it is
assumed under GPL.

To reproduce the bug, change to the 'connection' directory and type
./connection op=stat_ppp_log

You need to have CGI.pm to make it work.

I think the bug comes from me doing spaghetti object oriented programming
(Ehi, I'm italian and this is early development code, what would you expect?),
probably triggered by some error in the code.

In short, I use a sort of 'factory' classes that decide in the constructor
which implementation of them is good for this invocation and return an instance
of it, reading and compiling the correct perl module on the fly.

In my system the bug is perfectly reproducible.

I read the report at the bottom, and I saw informations probably about the
Debian mantainer of the perl package; my system is a Debian slink with kernel
2.2.13 on a Pentium 133 processor; CGI.pm is version 2.56-4.

Here's the beast; I'm at your disposal for any further information you might
need, or any experiment you might want me to do.

Thank you! Enrico

begin 644 connection.tar.gz
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`
end

Perl Info


Site configuration information for perl 5.00503:

Configured by torin at Wed Sep 22 00:18:38 PDT 1999.

Summary of my perl5 (5.0 patchlevel 5 subversion 3) configuration:
  Platform:
    osname=linux, osvers=2.0.36, archname=i386-linux
    uname='linux perv 2.0.36 #2 wed nov 18 03:00:48 pst 1998 i686 unknown '
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef useperlio=undef d_sfio=undef
  Compiler:
    cc='cc', optimize='-O2', gccversion=2.95.1 19990809 (prerelease)
    cppflags='-Dbool=char -DHAS_BOOL -D_REENTRANT -DDEBIAN -I/usr/local/include'
    ccflags ='-Dbool=char -DHAS_BOOL -D_REENTRANT -DDEBIAN -I/usr/local/include'
    stdchar='char', d_stdstdio=undef, usevfork=false
    intsize=4, longsize=4, ptrsize=4, doublesize=8
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    alignbytes=4, usemymalloc=n, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -lndbm -lgdbm -ldbm -ldb -ldl -lm -lc -lposix -lcrypt
    libc=, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
    cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib'

Locally applied patches:
    


@INC for perl 5.00503:
    /usr/lib/perl5/5.005/i386-linux
    /usr/lib/perl5/5.005
    /usr/local/lib/site_perl/i386-linux
    /usr/local/lib/site_perl
    /usr/lib/perl5
    .


Environment for perl 5.00503:
    HOME=/home/enrico
    LANG=it_IT
    LANGUAGE (unset)
    LD_LIBRARY_PATH (unset)
    LOGDIR (unset)
    PATH=/usr/local/jdk1.2/bin/:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
    PERL_BADLANG (unset)
    SHELL=/bin/bash

@p5pRT
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p5pRT commented Nov 29, 1999

From @vanstyn

In <E11sZdd-0000RM-00@​marvin.casa>, Enrico Zini writes​:
:I'm developing an administration suite written in Perl, and in just another
:cycle of run/stare at the error/patch, the error was 'panic​: POPSTACK'; as the
:Guide suggests, I choose not to panic but to report this as a bug.
:
:I include uuencoded (because I don't know if perlbug is going to ask me about
:files to include as attachments), the minimum subset of code to reproduce the
:error; the code contained in the file has no license in it yet, but it is
:assumed under GPL.

I'm sorry, but 2725 lines of code across 18 files is _not_ the minimum
subset of code to reproduce the bug.

:I think the bug comes from me doing spaghetti object oriented programming
:(Ehi, I'm italian and this is early development code, what would you expect?),
:probably triggered by some error in the code.

As far as I can tell, the POPSTACK occurs when a) a fatal error occurs
and b) the $SIG{__DIE__} handler invoked itself suffers a compile error
during an eval (trying to invoke Connection​::Reports​::CGI->new, which
doesn't exist). There may be some other factors and a few more nested
evals involved.

I believe it should be possible to reduce the problem to at most 100
lines of code across two or three files, which would make it a lot
easier to attempt to debug; but as the author of the code I think you
are better placed than I to do that.

Hugo van der Sanden

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