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From "Jie Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MESOS-209) A race bug in ProcessManager::spawn in libprocess.
Date Mon, 18 Jun 2012 23:56:42 GMT
Jie Yu created MESOS-209:
----------------------------

             Summary: A race bug in ProcessManager::spawn in libprocess.
                 Key: MESOS-209
                 URL: https://issues.apache.org/jira/browse/MESOS-209
             Project: Mesos
          Issue Type: Bug
          Components: c++-api
    Affects Versions: 0.9.0
         Environment: All platforms.
            Reporter: Jie Yu
            Priority: Critical


This is a race bug found in ProcessManager::spawn in libprocess. Below is the description
of this bug.

------------------------------------------------------------------------------------------------------
UPID ProcessManager::spawn(ProcessBase* process, bool manage)
{
  ...

  // Use the garbage collector if requested.
  if (manage) {
    dispatch(gc, &GarbageCollector::manage<ProcessBase>, process);
  }

  // Add process to the run queue (so 'initialize' will get invoked).
  enqueue(process);

  VLOG(2) << "Spawned process " << process->self();

  return process->self();
}
------------------------------------------------------------------------------------------------------

If a user spawns a process which is very short and sets 'manage' to true. It is likely that
the pointer 'process' becomes a dangling pointer after enqueue(..) is called. As a result,
a random segfault will be thrown when 'process->self()' is called.

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