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From "Pavel Afremov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5135) DRL VM hangs during stress.Mix running on x86-64
Date Fri, 16 Nov 2007 15:23:43 GMT
DRL VM hangs during stress.Mix running on x86-64
------------------------------------------------

                 Key: HARMONY-5135
                 URL: https://issues.apache.org/jira/browse/HARMONY-5135
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
         Environment: Linux x86-64
            Reporter: Pavel Afremov



The safe_point called from hycond_wait, which called from many places include locktable_reader_enter
and locktable_writer_enter.
>From other side access to locatable there is in function hythread_reclaim_recources, which
works during stop the world. 
It leads to dead lock, when first thread, which catch locktable monitor goes into safe poin
and GC starts. In this case GC can't complete work, because one or several threads waiting
on following stack, when first thread free locktable monitor:

	#1 <pthread_mutex_lock>
	#2 <hymutex_lock>
#3<hythread_reclaim_resources>
#4 <vm_reclaim_native_objs>
#5 <gc_reclaim_heap>
#6 <fspace_alloc>
#7 ....

So it's a deadlock when firs thread waits when second thread free monitor, and send thread
waits when first thread free the other monitor.


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