Updates:
        Owner: [email protected]
        Cc: [email protected]

Comment #3 on issue 19240 by [email protected]: Crash -  
DebugUtil::BreakDebugger()
http://code.google.com/p/chromium/issues/detail?id=19240

This crash is still seen in the latest 4.0.203.4 release. for example,
http://crash/reportdetail?reportid=5b554d2d674b849c:

Thread 2 *CRASHED* (EXC_BREAKPOINT / EXC_I386_BPT @0x01e5fb14)
0x01e5fb14      [Google Chrome Framework        - debug_util_posix.cc:116]
DebugUtil::BreakDebugger()
0x01e73058      [Google Chrome Framework        + 0x003ba058]   
0x01cfad0a      [Google Chrome Framework        - async_resource_handler.cc:145]
AsyncResourceHandler::OnResponseCompleted(int, URLRequestStatus const&,  
std::string
const&)
0x01d3d47c      [Google Chrome Framework        -  
safe_browsing_resource_handler.cc:146]
SafeBrowsingResourceHandler::OnResponseCompleted(int, URLRequestStatus  
const&,
std::string const&)
0x01d04278      [Google Chrome Framework        - 
buffered_resource_handler.cc:87]
BufferedResourceHandler::OnResponseCompleted(int, URLRequestStatus const&,
std::string const&)
0x01d2c2ea      [Google Chrome Framework        - 
resource_dispatcher_host.cc:1404]
ResourceDispatcherHost::OnResponseCompleted(URLRequest*)
0x01d2c408      [Google Chrome Framework        - 
resource_dispatcher_host.cc:1367]
ResourceDispatcherHost::OnReadCompleted(URLRequest*, int)
0x020b1865      [Google Chrome Framework        - url_request_job.cc:471]
URLRequestJob::NotifyReadComplete(int)
0x020ad4a8      [Google Chrome Framework        - url_request_http_job.cc:482]
URLRequestHttpJob::OnReadCompleted(int)
0x0206cb79      [Google Chrome Framework        - ../base/task.h:543]
net::HttpCache::Transaction::DoCallback(int)
0x0206cb9f      [Google Chrome Framework        - http_cache.cc:715]
net::HttpCache::Transaction::HandleResult(int)
0x0204b170      [Google Chrome Framework        - ../base/task.h:543]   
(anonymous
namespace)::SyncCallback::OnFileIOComplete(int)
0x020525a7      [Google Chrome Framework        - file_posix.cc:237]    
(anonymous
namespace)::InFlightIO::InvokeCallback((anonymous  
namespace)::BackgroundIO*, bool)
0x01e74db0      [Google Chrome Framework        - message_loop.cc:314]   
MessageLoop::RunTask(Task*)
0x01e753dd      [Google Chrome Framework        - message_loop.cc:322]
MessageLoop::DeferOrRunPendingTask(MessageLoop::PendingTask const&)
0x01e76772      [Google Chrome Framework        - message_loop.cc:429]   
MessageLoop::DoWork()
0x01e7a425      [Google Chrome Framework        - message_pump_libevent.cc:224]
base::MessagePumpLibevent::Run(base::MessagePump::Delegate*)
0x01e758f0      [Google Chrome Framework        - message_loop.cc:199]   
MessageLoop::RunInternal()
0x01e75975      [Google Chrome Framework        - message_loop.cc:155]   
MessageLoop::Run()
0x01e8e36c      [Google Chrome Framework        - thread.cc:156]         
base::Thread::ThreadMain()
0x01e7e420      [Google Chrome Framework        - platform_thread_posix.cc:26]  
 
ThreadFunc
0x93c90154      [libSystem.B.dylib      + 0x00032154]   _pthread_start
0x93c90011      [libSystem.B.dylib      + 0x00032011]   thread_start

It is a CHECK failure at async_resource_handler.cc:145:

140   // If we still have a read buffer, then see about caching it for  
later...
141   if (g_spare_read_buffer) {
142     read_buffer_ = NULL;
143   } else if (read_buffer_.get()) {
144     // TODO(willchan): Remove after debugging bug 16371.
145     CHECK(read_buffer_->data());
146     read_buffer_.swap(&g_spare_read_buffer);
147   }

Will, could you take a look at this?

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