Bug #4861 for CGI-Session: segfault when using file and storable serializer

Wed Jan 07 16:27:04 2004 Guest - Ticket created

Subject:

segfault when using file and storable serializer

When using the following code, the program segfaults during object destruction. --- #! /usr/bin/perl use strict; use CGI::Session::File; my $session = new CGI::Session("driver:File;serializer:Storable", undef, {Directory => '/tmp/'}); sub skip_this{ $session->debug(); } print "done\n"; --- I found that if I used the default or FreezeThaw serializer it would not setfault. This initially led me to believe it might be the serializer, however, if I use a mysql store and the Storable serializer it does not segfault. So, I'm not sure if it is the serializer or the storage mechanism, or something else. That is why I'm posting this under CGI::Session instead of CGI::Session::File... I tried to reduce the problem further, but I've not been able to cause the Storable module (used in CGI::Session::File for freeze/thawing) itself to segfault and the fact that it works for the mysql driver also leads me to think it is somewhere in the session code. Thanks, --Phillip

Wed Jan 07 16:29:39 2004 Guest - Correspondence added

[guest - Wed Jan 7 16:27:04 2004]: Show quoted text

> When using the following code, the program segfaults during object > destruction. > > --- > > #! /usr/bin/perl > > use strict; > use CGI::Session::File; > > my $session = new CGI::Session("driver:File;serializer:Storable", > undef, {Directory => '/tmp/'}); > > sub skip_this{ > $session->debug(); > } > > print "done\n"; > > --- > > I found that if I used the default or FreezeThaw serializer it would > not setfault. This initially led me to believe it might be the > serializer, however, if I use a mysql store and the Storable > serializer it does not segfault. > > So, I'm not sure if it is the serializer or the storage mechanism, or > something else. That is why I'm posting this under CGI::Session > instead of CGI::Session::File... > > I tried to reduce the problem further, but I've not been able to cause > the Storable module (used in CGI::Session::File for freeze/thawing) > itself to segfault and the fact that it works for the mysql driver > also leads me to think it is somewhere in the session code. > > Thanks, > > --Phillip

More info... this is perl version 5.8.0 running on Debian Linux 2.4.20 SMP

Mon Jul 04 15:08:20 2005 MARKSTOS [...] cpan.org - Correspondence added

From:

markstos [...] cpan.org

[guest - Wed Jan 7 16:27:04 2004]: Show quoted text

> When using the following code, the program segfaults during object > destruction. > > --- > > #! /usr/bin/perl > > use strict; > use CGI::Session::File; > > my $session = new CGI::Session("driver:File;serializer:Storable", > undef, {Directory => '/tmp/'}); > > sub skip_this{ > $session->debug(); > } > > print "done\n"; > > --- > > I found that if I used the default or FreezeThaw serializer it would > not setfault. This initially led me to believe it might be the > serializer, however, if I use a mysql store and the Storable > serializer it does not segfault. > > So, I'm not sure if it is the serializer or the storage mechanism, or > something else. That is why I'm posting this under CGI::Session > instead of CGI::Session::File... > > I tried to reduce the problem further, but I've not been able to

cause Show quoted text

> the Storable module (used in CGI::Session::File for

freeze/thawing) Show quoted text

> itself to segfault and the fact that it works for the mysql driver > also leads me to think it is somewhere in the session code. > > Thanks, > > --Phillip

I reproduced this on FreeBSD 4.10. But I don't think this is a bug with CGI::Session, because you are calling the debug() method, which has never existed! (Maybe you meant dump()? ). Changing debug() to dump() makes the code work. Also, I think you meant 'use CGI::Session', not 'use CGI::Session::File'; I think this bug report is safe to close.

Wed Jul 06 12:36:21 2005 Guest - Correspondence added

[MARKSTOS - Mon Jul 4 15:08:20 2005]: Show quoted text

> [guest - Wed Jan 7 16:27:04 2004]: >

> > When using the following code, the program segfaults during object > > destruction. > > > > --- > > > > #! /usr/bin/perl > > > > use strict; > > use CGI::Session::File; > > > > my $session = new CGI::Session("driver:File;serializer:Storable", > > undef, {Directory => '/tmp/'}); > > > > sub skip_this{ > > $session->debug(); > > } > > > > print "done\n"; > > > > --- > > > > I found that if I used the default or FreezeThaw serializer it would > > not setfault. This initially led me to believe it might be the > > serializer, however, if I use a mysql store and the Storable > > serializer it does not segfault. > > > > So, I'm not sure if it is the serializer or the storage mechanism,

> or

> > something else. That is why I'm posting this under CGI::Session > > instead of CGI::Session::File... > > > > I tried to reduce the problem further, but I've not been able to

> cause

> > the Storable module (used in CGI::Session::File for

> freeze/thawing)

> > itself to segfault and the fact that it works for the mysql

> driver

> > also leads me to think it is somewhere in the session code. > > > > Thanks, > > > > --Phillip

> > I reproduced this on FreeBSD 4.10. > > But I don't think this is a bug with CGI::Session, because you are > calling the debug() method, which has never existed! (Maybe you meant > dump()? ). Changing debug() to dump() makes the code work.

Yep, I'm stupid. That fixes it. (tho I've long moved past this...) Show quoted text

> > Also, I think you meant 'use CGI::Session', not 'use > CGI::Session::File';

Hm... Just rechecked the docs... that does appear to be what the docs give as an example. That shouldn't cause a problem tho, should it? Especially since CGI::Session::File uses CGI::Session as a base class... Show quoted text

> > I think this bug report is safe to close.

Yes, I agree.

Thu Jul 21 20:52:59 2005 MARKSTOS [...] cpan.org - Taken

Thu Jul 21 20:53:21 2005 MARKSTOS [...] cpan.org - Status changed from 'new' to 'resolved'