Forum: Ruby on Rails Segmentation fault on page requests

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Cody Caughlan (Guest)
on 2006-05-20 21:01
(Received via mailing list)
Hi,

I am new to Rails and got the "Agile Web Dev with Rails book",
following along with the examples...starting the Depot sample app, but
am running into segmentation faults and my WEBrick console looks like
this:

<error>
http://127.0.0.1:3000/admin/ -> /admin/show/1
c:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.1/lib/action_controller
ration.rb:45: [BUG] Segmentation fault
ruby 1.8.2 (2004-12-25) [i386-mswin32]


This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.
</error>

The core Ruby/Rails distribution source file that throws this error is
not always the same (e.g my console says it has also been thrown by
"c:/ruby/lib/ruby/1.8/webrick/accesslog.rb:51:")

It doesnt always happen in the same action. Sometimes when I "Edit" a
product, sometimes when I just cancel an edit or sometimes just doing
a basic list action. It doesnt happen *every* time, somewhere around
50%.

I did a search for "segmentation fault" on this list and I can see
that others have experienced issues similar to this.

Environment: Windows 2000
- Ruby: 1.8.2
- MySQL 5.0.16 on a separate Linux machine
- latest Rails (1.1.2)
- MySQL bindings retrieved via "gem install mysql" and then choosing
Option 1( mysql 2.7.2006.05.10 (mswin32)" (I also tried a slightly
dated version "mysql 2.7.2006.04.21", same result..


Thanks in advance
/Cody
Thanks!
Bill W. (Guest)
on 2006-05-20 21:22
(Received via mailing list)
Hi Cody,

Cody Caughlan wrote:

> I am new to Rails and got the "Agile Web Dev with Rails book", following
> along with the examples...starting the Depot sample app,
> but am running into segmentation faults and my WEBrick console looks like
> this:

Don't know for sure if this is your problem, but...

One source of segmentation faults has been traced to an incompatibility
with
the compiled MySQL driver on Win2K (both a patch and a permanent fix are
"in
the works").  The quick workaround is to eliminate the compiled driver
and
let Rails pick up the native Ruby version (which it will automatically).
Try renaming /ruby/lib/ruby/site_ruby/1.8/i386-msvcrt/mysql.so to
something
(like mysql.sob ;-) ) and see if that helps.

Best regards,
Bill
Cody Caughlan (Guest)
on 2006-05-20 21:25
(Received via mailing list)
Bill-

Thanks for the advice. Unfortunately, it did not work. Same seg fault
message after my 3rd page request :)

/Cody
Bryan D. (Guest)
on 2006-05-21 17:40
I had this same problem, and I'm still waiting for a fix. When's that
patch coming out?
Bill W. (Guest)
on 2006-05-21 21:12
(Received via mailing list)
Hi Cody,

Cody Caughlan wrote:

> Thanks for the advice. Unfortunately, it did not work. Same seg fault
> message after my 3rd page request :)

Sorry to hear that.  I was hopeful but had my doubts given that you're
running MySQL on a seperate box.  So...

I'm going to forward your initial posting to the developers who are
working
on the driver problem.  With a little luck, they may see your problem as
an
opportunity ;-)

As far as getting you going in the short term, if your situation allows,
I'd
recommend using a local version of MySQL for now.  My earlier
recommendation
will definitely allow you to move forward with working through the AWD
book.
The least painful way to proceed, in my experience, is to use Instant
Rails
in the short term.  It provides a standalone environment that's there
when
you need it but not 'integrated' into the rest of your environment so
there's very little opportunity for conflict.

You can pick it up here:  http://instantrails.rubyforge.org/wiki/wiki.pl

The 1.3a release uses the pure Ruby adapter which is what you'd want.

HTH,
Bill
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