From: Eric Hodel <drbrain@...7.net>
Date: 2005-11-17T07:46:35+09:00
Subject: Re: DRb Crashing

On Nov 16, 2005, at 9:36 AM, Hugh Sasse wrote:

> On Thu, 17 Nov 2005, James Edward Gray II wrote:
>
>> $ ruby client.rb
>> (druby://localhost:61676) /usr/local/lib/ruby/1.8/rinda/ 
>> tuplespace.rb:446:in
>> `move': undefined method `push' for :push:Symbol (NoMethodError)
>
> which means the parameter port is set to :push
>
>>        from (druby://localhost:61676)
>> /usr/local/lib/ruby/1.8/monitor.rb:229:in `synchronize'
>>        from (druby://localhost:61676)
>> /usr/local/lib/ruby/1.8/rinda/tuplespace.rb:443:in `move'
>>        from (druby://localhost:61676)
>> /usr/local/lib/ruby/1.8/drb/drb.rb:1552:in `perform_without_block'
>>        from (druby://localhost:61676)
>
> something to do with @obj and @argv. These are delivered by
> __send__.
>
>> /usr/local/lib/ruby/1.8/drb/drb.rb:1512:in `perform'
>>        from (druby://localhost:61676)
>> /usr/local/lib/ruby/1.8/drb/drb.rb:1586:in `main_loop'
>>        from (druby://localhost:61676)
>
> seems to come from cliemt.recvfrom.
>> /usr/local/lib/ruby/1.8/drb/drb.rb:1582:in `main_loop'
>         [...]
>> /usr/local/lib/ruby/1.8/drb/drb.rb:1624:in `start_service'
>>        from (druby://localhost:61676) server.rb:7
>>        from /usr/local/lib/ruby/1.8/rinda/rinda.rb:229:in `take'
>>        from client.rb:11
>
> All comments are from looking at the CVS, but the line numbers
> agree, AFAICS.
>> $ cat client.rb
>         [...]
>> __END__
>
> Looks fine to me.
>
>       I'm stumped.

This is likely not a problem that can be fixed with more Ruby code.

I ran the two files on DRb for over 4 hours continuously on a FreeBSD  
machine, which tells me that it is Mac-specific.  Mixing FreeBSD and  
Mac would always crash within 5 minutes at worst.  My best guess is  
that Marshal is not operating correctly or ObjectSpace#_id2ref is  
looking up bad objects.

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
FEC2 57F1 D465 EB15 5D6E  7C11 332A 551C 796C 9F04