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From BeeThere Admin <ad...@beethere.net>
Subject Re: Intermittent Segfaults
Date Mon, 20 Mar 2006 23:37:31 GMT
I don't know the details, it seems to be a pretty general problem. Gerald seems to be on it
though. He even said that he was working through the weekend (bless his heart :-)
 
The symptom on the user side, at least for me is a completely blank page. It looks like the
server sends back a 200 OK, but then nothing else. There doesn't seem to be any way to debug
the problem at the Embperl-user side because none of the page code ever gets executed, not
even your base.epl (or whatever you call it). A page refresh will usually result in the expected
page rendering, but at least for us, this is a critical issue holding a major release, business
deals, etc.
 
I looked into the logs because a user told me they couldn't get into a section of the site
because they only got a blank page. The page seems to be random, but I can easily reproduce
the problem in my dev environment now.
 
FYI,
 
-Carl
 
Bee Software LLC 
See us in action at: http://beethere.net/

----- Original Message ----
From: Hartmaier Alexander <Alexander.Hartmaier@t-systems.at>
To: embperl@perl.apache.org
Sent: Monday, March 20, 2006 12:50:29 PM
Subject: RE: Intermittent Segfaults


I just found out that I have segfaults on my servers too.
OS is debian testing
The apache startup message should include all infos you might want to know too:
[Mon Mar 20 18:27:05 2006] [notice] Apache/2.0.55 (Debian) Embperl/2.1.0 mod_ssl/2.0.55 OpenSSL/0.9.8a
mod_apreq2-20051231/2.5.7 mod_perl/2.0.2 Perl/v5.8.8 configured -- resuming normal operations

I've recompiled Embperl today to make sure it uses the current software versions but that
didn't help.

-Alex


-----Original Message-----
From: Gerald Richter [mailto:richter@ecos.de] 
Sent: Friday, March 17, 2006 9:16 PM
To: 'BeeThere Admin'; embperl@perl.apache.org
Subject: RE: Intermittent Segfaults


>  
> I have continued testing, and I can confidently say that the 
> problem is definitely not an out-of-memory issue. 

ok

> The new dev 
> version you sent is segfaulting about once for every 100 page 
> requests in dev now, with no load except me clicking around, 
> on a machine with 2G total RAM and plenty of free memory. 
>  
> The segfaults have occurred during pretty much every type of 
> page request, and also not occurred on those same requests. 
> Hitting refresh will always result in the page being 
> correctly sent, with not segfault, on at most a couple pushes.
>  
> Did you get the back-traces I sent? 

Yes. These backtraces are with the new version I sent, right? (I need to
make sure the line numbers of the backtrace matches my source)

> I sent them to your 
> personal account, but I realized that you may check the list 
> more. Every back-trace points to "EMBPERL2_Node_appendChild 
> .... at epdom.c:2835" as the point of segfaulting.
>  
> The only Embperl tags I ever use are the PerlBlock '[* *], [+ 
> +], [- -]' tags. Is there someway I can bypass this 'epdom' 
> code all together? (I don't see any reason for dom-parsing)
>  

This code also parses [..] tags, so you will need it. (It never builds a
full dom tree of your source, it only parses out the tags that you tell
Embperl to process)

I have to take a deeper look at the backtraces. I will come back to you as
soon as possible

Gerald





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