segmentation fault related to the relaying of subprocess stdout.

[automatthew]

/usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/logger.rb:77: [BUG] Segmentation fault
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]

-- Control frame information -----------------------------------------------
c:0007 p:0012 s:0030 b:0029 l:000028 d:000028 METHOD /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/logger.rb:77
c:0006 p:0034 s:0024 b:0023 l:000022 d:000022 METHOD /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/logger.rb:32
c:0005 p:---- s:0018 b:0018 l:000017 d:000017 FINISH
c:0004 p:---- s:0016 b:0016 l:000015 d:000015 CFUNC  :copy_stream
c:0003 p:0126 s:0011 b:0011 l:000228 d:000010 BLOCK  /usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/process_manager.rb:100
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:---- s:0002 b:0002 l:000001 d:000001 TOP   

-- Ruby level backtrace information ----------------------------------------
/usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/process_manager.rb:100:in `block in spawn'
/usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/process_manager.rb:100:in `copy_stream'
/usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/logger.rb:32:in `write'
/usr/local/rbenv/versions/1.9.3-p194/lib/ruby/gems/1.9.1/gems/fate-0.2.12/lib/fate/logger.rb:77:in `format'

-- C level backtrace information -------------------------------------------
Segmentation fault

This looks to be a bug in Ruby's IO.copy_stream method, but the only references I could find are to non-Linux platforms.

Cygwin: http://www.ruby-forum.com/topic/214105

Bug report in Japanese possibly about Mac OS X: http://bugs.ruby-lang.org/issues/4866. After squinting at the Google Translated version, I think that the bug was closed because the assignee couldn't reproduce it on non Mac platforms.

I can avoid the use of IO.copy_stream by manually relaying from one IO object to another.