Disable the aggressive memcmp checks under ASan.

scripts/slave/runtest.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.
 
 """A tool to run a chrome test executable, used by the buildbot slaves.
 
   When this is run, the current directory (cwd) should be the outer build
   directory (e.g., chrome-release/build/).
 
@@ skipping 1014 matching lines @@
       'llvm-build', 'Release+Asserts', 'bin', 'llvm-symbolizer'))
   tsan_options = ('suppressions=src/tools/valgrind/tsan_v2/suppressions.txt '
                   'report_signal_unsafe=0 '
                   'report_thread_leaks=0 '
                   'external_symbolizer_path=%s' % symbolizer_path)
   if options.factory_properties.get('tsan', False):
     os.environ['TSAN_OPTIONS'] = tsan_options
   if options.factory_properties.get('asan', False):
     # Set the path to llvm-symbolizer to be used by asan_symbolize.py
     os.environ['LLVM_SYMBOLIZER_PATH'] = symbolizer_path
+    # Avoid aggressive memcmp checks until http://crbug.com/178677 is fixed.
+    os.environ['ASAN_OPTIONS'] = 'strict_memcmp=0'
   # Set the number of shards environement variables.
   if options.total_shards and options.shard_index:
     os.environ['GTEST_TOTAL_SHARDS'] = str(options.total_shards)
     os.environ['GTEST_SHARD_INDEX'] = str(options.shard_index - 1)
 
   if options.results_directory:
     options.test_output_xml = os.path.normpath(os.path.join(
         options.results_directory, '%s.xml' % options.test_type))
     args.append('--gtest_output=xml:' + options.test_output_xml)
 
@@ skipping 26 matching lines @@
         '%d new files were left in %s: Fix the tests to clean up themselves.'
         ) % ((new_temp_files - temp_files), tempfile.gettempdir())
     # TODO(maruel): Make it an error soon. Not yet since I want to iron out all
     # the remaining cases before.
     #result = 1
   return result
 
 
 if '__main__' == __name__:
   sys.exit(main())