Band-aid fix for test hangs:

base/process_util_posix.cc

 // 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.
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <stdlib.h>
 #include <sys/resource.h>
@@ skipping 123 matching lines @@
 
   return status;
 }
 
 // Android has built-in crash handling.
 #if !defined(OS_ANDROID)
 void StackDumpSignalHandler(int signal, siginfo_t* info, ucontext_t* context) {
   if (debug::BeingDebugged())
     debug::BreakDebugger();
 
+#if defined(OS_MACOSX)
+  // TODO(phajdan.jr): Fix hangs caused by using malloc below.

[Scott Hess - ex-Googler, 2012/10/30 23:59:55]

Ref a tracking bug for this, and maybe s/malloc/tcmalloc/.

   DLOG(ERROR) << "Received signal " << signal;
   debug::StackTrace().PrintBacktrace();
+#endif
 
   // TODO(shess): Port to Linux.
 #if defined(OS_MACOSX)
   // TODO(shess): Port to 64-bit.
 #if ARCH_CPU_32_BITS
   char buf[1024];
   size_t len;
 
   // NOTE: Even |snprintf()| is not on the approved list for signal
   // handlers, but buffered I/O is definitely not on the list due to
@@ skipping 1182 matching lines @@
   if (IsChildDead(process))
     return;
 
   BackgroundReaper* reaper = new BackgroundReaper(process, 0);
   PlatformThread::CreateNonJoinable(0, reaper);
 }
 
 #endif  // !defined(OS_MACOSX)
 
 }  // namespace base