From: Eric Hodel <drbrain@...7.net>
Date: 2005-11-17T07:48:08+09:00
Subject: Re: DRb Crashing

On Nov 16, 2005, at 2:46 PM, Eric Hodel wrote:

> 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.

I should also note that disabling the GC on the client does not  
affect the frequency of crashes.

-- 
Eric Hodel - drbrain@segment7.net - http://segment7.net
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