Disable profiler, as profiler shutdown is racing with isolates.

runtime/vm/profiler.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <cstdio>
 
 #include "platform/utils.h"
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
@@ skipping 50 matching lines @@
 
 // Notes on stack frame walking:
 //
 // The sampling profiler will collect up to Sample::kNumStackFrames stack frames
 // The stack frame walking code uses the frame pointer to traverse the stack.
 // If the VM is compiled without frame pointers (which is the default on
 // recent GCC versions with optimizing enabled) the stack walking code will
 // fail (sometimes leading to a crash).
 //
 
-DEFINE_FLAG(bool, profile, true, "Enable Sampling Profiler");
+DEFINE_FLAG(bool, profile, false, "Enable Sampling Profiler");
 DEFINE_FLAG(bool, trace_profiled_isolates, false, "Trace profiled isolates.");
 
 bool ProfilerManager::initialized_ = false;
 bool ProfilerManager::shutdown_ = false;
 bool ProfilerManager::thread_running_ = false;
 Monitor* ProfilerManager::monitor_ = NULL;
 Monitor* ProfilerManager::start_stop_monitor_ = NULL;
 Isolate** ProfilerManager::isolates_ = NULL;
 intptr_t ProfilerManager::isolates_capacity_ = 0;
 intptr_t ProfilerManager::isolates_size_ = 0;
@@ skipping 605 matching lines @@
     return false;
   }
   uintptr_t cursor = reinterpret_cast<uintptr_t>(fp);
   cursor += sizeof(fp);
   bool r = cursor >= lower_bound_ && cursor < stack_upper_;
   return r;
 }
 
 
 }  // namespace dart