Carsten,
I've filed the following new bug to track this potential issue:
JDK-8072439 fix for 8047720 may need more work
https://bugs.openjdk.java.net/browse/JDK-8072439
Dan
On 2/3/15 12:00 PM, Carsten Varming wrote:
Greetings all,
I was recently introduced to the deadlock described in JDK-8047720 and
fixed in JDK9. The fix seems a little messy to me, and it looks like
it left some very short races in the code. So I decided to clean up
the code. See attached diff.
The change takes a step back and acquires PeriodicTask_lock in
WatcherThread::stop (like before the fix in JDK9), but this time
safepoints are allowed to proceed when acquiring PeriodicTask_lock,
preventing the deadlock.
Let me know what you think,
Carsten
