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Posted to asp@perl.apache.org by Tim Moore <Ti...@formscape.com> on 2002/10/04 15:32:12 UTC
RE: MLDBM errors
> -----Original Message-----
> From: Josh Chamas [mailto:josh@chamas.com]
> Tim Moore wrote:
> >
> > StateDir is set to /tmp/asp, which according to Solaris is
> mounted under
> > 'swap' Filesystem (not NFS though). Could be a problem
> being under 'swap' ?
> >
> > P.S. I've checked out the directories/files it's
> complaining about, but they
> > look fine.
> >
>
> That is probably not it necessarily. I used to have NodeWorks
> StateDir under Solaris swap /tmp/ for years just fine.
> But somethng must have been getting it corrupt.
>
> > We don't use $Application and have very minimal use of
> $Session. In fact all
> > we use $Session for is to get the session ID, and we're
> planning to drop
> > session support anyway (as we will need to spread across
> multiple servers),
> > so we could just set NoState to 1 as you say.
> >
>
> Sounds like a plan.
>
More on those errors I'm getting. We haven't dropped the session support yet
but we had some more 'lock' ups and the following in the apache error log...
MLDBM error: Please make sure
MLDBM/Serializer/<soh><soh><soh><soh>/Dumper.pm is a properly installed
package.
Perl says: "Unrecognized character \x11 at
/opt/our_product/perl/lib/site_perl/5.6.1//MLDBM/Serializer/ line 1.
Compilation failed in require at
/opt/our_product/perl/lib/site_perl/5.6.1/MLDBM.pm line 107.
" at /opt/our_product/perl/lib/site_perl/5.6.1/MLDBM/Sync.pm line 214
[Fri Oct 4 13:42:54 2002] [error] can't tie to MLDBM with args:
/tmp/asp/server/internal,258,416; error: at
/opt/our_product/perl/lib/site_perl/5.6.1/MLDBM/Sync.pm line 214.
Attempt to free non-existent shared string at
/opt/our_product/perl/lib/site_perl/5.6.1/Apache/ASP.pm line 430.
Attempt to free non-existent shared string at
/opt/our_product/perl/lib/site_perl/5.6.1/Apache/ASP.pm line 430.
Attempt to free non-existent shared string at
/opt/our_product/perl/lib/site_perl/5.6.1/Apache/ASP/Session.pm line 179.
The line that talks about Dumper.pm not being installed correctly (possibly)
features four <soh> characters (whatever they are, but 'nedit' shows them as
<soh>). Strange thing is the missing directory name is Data which is present
on the disc and the number of <soh> characters matches the name 'Data'. This
has occurred now on a fresh install on another machine.
Our 'lock' up is at about the time of the MLDBM error, and after a while it
clears and then we get the shared string errors.
For info the versions of the components as far as Apache::ASP is concerned
are...
Apache::ASP - 2.37
MLDBM - 2.01
MLDBM::Sync - 0.30
Digest::MD5 - 2.20
Seems that only Apache::ASP is out of date, though I can't find 2.37 on CPAN
any more (not at http://cpan.org/modules/by-module/Apache anyway). 2.35 and
2.41 is there, though the readme for 2.41 doesn't say what's changed since
2.35.
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Re: MLDBM errors
Posted by Josh Chamas <jo...@chamas.com>.
Tim Moore wrote:
>
> More on those errors I'm getting. We haven't dropped the session support yet
> but we had some more 'lock' ups and the following in the apache error log...
>
> MLDBM error: Please make sure
> MLDBM/Serializer/<soh><soh><soh><soh>/Dumper.pm is a properly installed
> package.
> Perl says: "Unrecognized character \x11 at
> /opt/our_product/perl/lib/site_perl/5.6.1//MLDBM/Serializer/ line 1.
> Compilation failed in require at
I am betting now that your data you are storing is doing some
kind of unlikely buffer overflow in some lib like SDBM_File
or Data::Dumper, so try changing these with the StateSerializer
and StateDB config settings. Once a perl lib has a buffer
overflow, it can whack perl data structures arbitrarily
resulting in really odd errors.
> Seems that only Apache::ASP is out of date, though I can't find 2.37 on CPAN
> any more (not at http://cpan.org/modules/by-module/Apache anyway). 2.35 and
> 2.41 is there, though the readme for 2.41 doesn't say what's changed since
> 2.35.
>
Look at the CHANGES file in recent distributions for
what has changed since 2.35.
Regards,
Josh
________________________________________________________________
Josh Chamas, Founder phone:925-552-0128
Chamas Enterprises Inc. http://www.chamas.com
NodeWorks Link Checking http://www.nodeworks.com
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