Disable buffering in apply_issue.py to try to find out the problem.

apply_issue.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Applies an issue from Rietveld.
 """
 
 import getpass
 import logging
 import optparse
 import os
 import subprocess
 import sys
 import urllib2
 
 import breakpad  # pylint: disable=W0611
 
 import checkout
 import fix_encoding
 import gclient_utils
 import rietveld
 import scm
 
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 
 
+class Unbuffered(object):
+  """Disable buffering on a file object."""
+  def __init__(self, stream):
+    self.stream = stream
+
+  def write(self, data):
+    self.stream.write(data)
+    self.stream.flush()
+
+  def __getattr__(self, attr):
+    return getattr(self.stream, attr)
+
+
 def main():
+  sys.stdout = Unbuffered(sys.stdout)
   parser = optparse.OptionParser(description=sys.modules[__name__].__doc__)
   parser.add_option(
       '-v', '--verbose', action='count', default=0,
       help='Prints debugging infos')
   parser.add_option(
       '-e', '--email',
       help='Email address to access rietveld.  If not specified, anonymous '
            'access will be used.')
   parser.add_option(
       '-w', '--password', default=None,
@@ skipping 122 matching lines @@
       if sys.platform == 'win32':
         gclient_path += '.bat'
       return subprocess.call(
           [gclient_path, 'sync', '--revision', base_rev], cwd=gclient_root)
   return 0
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   sys.exit(main())