Index: lldb/trunk/source/Utility/TaskPool.cpp
===================================================================
--- lldb/trunk/source/Utility/TaskPool.cpp
+++ lldb/trunk/source/Utility/TaskPool.cpp
@@ -61,8 +61,9 @@
     if (m_thread_count < max_threads)
     {
         m_thread_count++;
-        lock.unlock();
-
+        // Note that this detach call needs to happen with the m_tasks_mutex held. This prevents the thread
+        // from exiting prematurely and triggering a linux libc bug
+        // (https://sourceware.org/bugzilla/show_bug.cgi?id=19951).
         std::thread (Worker, this).detach();
     }
 }