RFR(S): 8141356: Explicitly stop CMS threads during VM termination.

Jon Masamitsu jon.masamitsu at oracle.com
Wed Nov 4 17:25:00 UTC 2015



On 11/3/2015 5:32 PM, Jungwoo Ha wrote:
> Somehow I didn't receive Jon's email.
> We've first noticed this on JDK8, but I think the bug is more 
> triggered with the tcmalloc + custom launcher.
>

Jungwoo,

Do you have a test that exhibits the bug?

Jon

>
>
> On Tue, Nov 3, 2015 at 4:14 PM, Carsten Varming <varming at gmail.com 
> <mailto:varming at gmail.com>> wrote:
>
>     Dear Jon,
>
>     I am pretty sure this has been that way for a long time. I have
>     never seen a problem, but I would like to see Hotspot shut down
>     its threads as well.
>
>     Carsten
>
>     On Tue, Nov 3, 2015 at 5:40 PM, Jon Masamitsu
>     <jon.masamitsu at oracle.com <mailto:jon.masamitsu at oracle.com>> wrote:
>
>         Jungwoo,
>
>         Did you first see this bug in jdk8?  I'm wondering if it
>         was always broken.
>
>         Jon
>
>         On 11/03/2015 01:14 PM, Jungwoo Ha wrote:
>>         BUG: https://bugs.openjdk.java.net/browse/JDK-8141356
>>         Webrev: http://cr.openjdk.java.net/~jwha/8141356/webrev.00/
>>         <http://cr.openjdk.java.net/%7Ejwha/8141356/webrev.00/>
>>
>>         Inside before_exit(), it says
>>
>>         // Stop concurrent GC threads
>>         Universe::heap()->stop();
>>
>>         but GenCollectedHeap never implemented stop() method, and
>>         thus calling empty SharedHeap::stop() method.
>>         This causes CMS threads to run during the VM termination and
>>         ends up crashing.
>>         ConcurrentMarkSweepThread::stop() is currently a dead code
>>         and never gets called.
>>         The patch just implemented GenCollectedHeap::stop() to call
>>         ConcurrentMarkSweepThread::stop().
>>
>>         Can someone sponsor this patch?
>>
>>         -- 
>>         Jungwoo Ha | Google | jwha at google.com <mailto:jwha at google.com>
>>
>
>
>
>
>
> -- 
> Jungwoo Ha | Java Platform Team | jwha at google.com <mailto:jwha at google.com>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/attachments/20151104/70d47c6d/attachment-0001.html>


More information about the hotspot-gc-dev mailing list