RFR (S) 8048215: [TESTBUG] java/lang/management/ManagementFactory/ThreadMXBeanProxy.java Expected non-null LockInfo

David Holmes david.holmes at oracle.com
Mon Oct 15 11:55:11 UTC 2018


Thanks for the review Daniel!

David

On 15/10/2018 7:47 PM, Daniel Fuchs wrote:
> Hi David,
> 
> Good finding! Looks reasonable to me.
> 
> best regards,
> 
> -- daniel
> 
> On 15/10/2018 05:23, David Holmes wrote:
>> bug: https://bugs.openjdk.java.net/browse/JDK-8048215
>> webrev: http://cr.openjdk.java.net/~dholmes/8048215/webrev/
>>
>> Simple race condition in the test. The main thread does checks that 
>> are only valid once the target thread has called o.wait() but there's 
>> nothing to ensure that point of execution is reached. The failure is 
>> easily reprodcued by just putting in a sleep after:
>>
>> Object o = new Object();
>>
>> Fix is to add a shared 'waiter' Object that the target waits upon and 
>> for which the main also synchronizes on such that the main thread 
>> can't proceed until wait() has been called and released the monitor.
>>
>> Thanks,
>> David
> 


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