Confused classes

[Warren Konkel <warren.konkel@gmail.com>]

I switched from mod_passenger to unicorn on a fairly high traffic site
and ran into a strange problem that forced me to move back to
mod_passenger... it seems as if classes would sometimes get mixed up
with each other.  If I had two Rails models:

  class Foo < ActiveRecord::Base;  end
  class Bar < ActiveRecord::Base;  end

Normally Foo.inspect and Bar.inspect would return:

  Foo(field1: integer, field2: integer)
  Bar(field3: integer, field4: integer)

When things were "broken" within a process, sometimes I would see:

   Foo(field3: integer, field4: integer)    <--- note field3/field4
actually belong to Bar, not Foo

And because of that, wacky errors would appear in my logs like:

   Foo.find_by_field1(12345) --> not a method
   Foo.create(:field1 => 12345)  --> column not found

I also noticed the problem with field serializing in ActiveRecord... given:

  class Boz < ActiveRecord::Base
    serialize :some_data
  end

When processes were working correctly,  Boz.find(1).some_data would
return an actual object (like a Hash).  When things were broken, the
raw serialized string from the database would be returned... almost as
if the Boz class "forgot" that it's supposed to deserialize
"some_data".

Could it be that class attributes are somehow being co-mingled when
unicorn is starting up under high concurrency?  Perhaps a mutex is
missing somewhere?
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