[Mongrel] Mongrel Processes Dying

mongrel_users at homerlex.mailshell.com mongrel_users at homerlex.mailshell.com
Thu Sep 28 09:43:07 EDT 2006

I haven't turned on core dumps yet.  Things were quite for a couple days but this morning a few processes died and I see some new Segmentation faults:

/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.0/lib/action_view/base.rb:410: [BUG] Segmentation fault ruby 1.8.4 (2005-12-24) [i686-linux]

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.14.0/lib/active_record/connection_adapters/mysql_adapter.rb:148: [BUG] /usr/local/lib/ruby/gems/1.8/gems/mongrel- [BUG] /usr/local/lib/ruby/gems/1.8/gems/mongrel- [BUG] Segmentation fault ruby 1.8.4 (2005-12-24) [i686-linux]

/usr/local/lib/ruby/gems/1.8/gems/mongrel- [BUG] Segmentation fault ruby 1.8.4 (2005-12-24) [i686-linux]

-----Original Message-----
From: mongrel-users-bounces at rubyforge.org [mailto:mongrel-users-bounces at rubyforge.org] On Behalf Of Zed A. Shaw
Sent: Tuesday, September 26, 2006 10:35 AM
To: mongrel-users at rubyforge.org
Subject: Re: [Mongrel] Mongrel Processes Dying

On Tue, 26 Sep 2006 05:50:37 -0700
mongrel_users at homerlex.mailshell.com wrote:

> We are seeing mongrel processes dying in our mongrel cluster.  What is 
> the best way to troubleshoot this?
> We have ruby 1.8.4, Rails 1.1.0 (upgrading soon), MySql 4.1 running on 
> Red Hat Enterprise Linux ES release 4, Apache 2.2, mongrel-, 
> mongrel_cluster-0.2.0
> I saw the following messages in the mongrel.log but not sure if theay 
> are related to the processes dying.  It would be nice if the log had date/time for each entry!
> /usr/local/lib/ruby/1.8/net/http.rb:562: [BUG] Segmentation fault ruby 
> 1.8.4 (2005-12-24) [i686-linux]

These are segmentation faults inside Ruby's http code.  Not sure how you're getting those but you'll need to investigate how your system is apparently totally different from everyone else's.  For example, why is it in /usr/local?  I'm thinking maybe you're mixing ruby installations/versions.

And, it's really hard to change http.rb to produce timestamps during a segfault.  Actually the fact that ruby is giving you a line number is pretty magical, so be thankful.  Normally you'd have to gdb a core file for that.

Which brings up another thing, turn on core dumps and that might help track it down.

Zed A. Shaw, MUDCRAP-CE Master Black Belt Sifu 

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