From: "Timothy J. Wood" <tjw@...>
Date: 2006-02-06T02:50:19+09:00
Subject: Is the SQLite3 gem known to have memory corruption?


   Running the following produces bizarre results (trimmed down from  
an actual app):

-----
#!/opt/local/bin/ruby

require 'rubygems'
require_gem 'sqlite3-ruby'

def each_batch(size=1)
   until false
     batch = []
     (1..20).each {|i| batch << "x"}
     yield batch
   end
end

database = SQLite3::Database.new("/tmp/test.db")
counter = 0
each_batch {|batch|
   database.transaction {
     counter += batch.length
     print "OK\n"
   }
}
-----

   For a while it prints "OK", but then eventually:

./test_bad_batch.rb:20: undefined method `length' for 4085314:Fixnum  
(NoMethodError)
         from /opt/local/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.1.0/ 
lib/sqlite3/database.rb:593:in `transaction'
         from ./test_bad_batch.rb:19
         from ./test_bad_batch.rb:11:in `each_batch'
         from ./test_bad_batch.rb:11:in `each_batch'
         from ./test_bad_batch.rb:18


   That is the 'batch' is getting yielded as random pointer instead  
of the array generated inside each_batch!

   I've tried narrowing this further (particularly getting rid of  
SQLite usage), but this is the simplest case I can come up with so far.

   I'm running on Mac OS X 10.4.4 with ruby 1.8.4 installed via  
Darwin Ports (as well as rubygems installed from there and then  
sqlite3 installed via that copy of gems).

----
% /opt/local/bin/ruby -v
ruby 1.8.4 (2005-12-24) [powerpc-darwin8.3.0]

% /opt/local/bin/gem list sqlite3-ruby

*** LOCAL GEMS ***

sqlite3-ruby (1.1.0)
     SQLite3/Ruby is a module to allow Ruby scripts to interface with a
     SQLite3 database.
----

   I've tried both the system supplied sqlite (v3.1.3) and the latest  
version (installed via Darwin Ports), 3.3.3.

   Any info would be helpful!

-tim