RFR (XXXS) 8173693 disable post_class_unload() for non JavaThread initiators

[serguei.spitsyn at oracle.com]

Dan,

It looks good.
Thank you for the work around.

Thanks,
Serguei


On 1/31/17 09:18, Daniel D. Daugherty wrote:
> Greetings,
>
> I have a very small work around for a JVM/TI event posting bug:
>
>     JDK-8173693 disable post_class_unload() for non JavaThread initiators
>     https://bugs.openjdk.java.net/browse/JDK-8173693
>
> This work around disables the JVM/TI post_class_unload() function
> when the thread requesting the event is not a JavaThread. See:
>
>     JDK-8173658 JvmtiExport::post_class_unload() is broken for 
> non-JavaThread initiators
>     https://bugs.openjdk.java.net/browse/JDK-8173658
>
> for the gory details of what can (and has) gone wrong.
>
> Fixing JDK-8173658 is non-trivial so this work around is proposed
> to avoid allowing a Class Unload event to crash the VM or silently
> corrupt the non JavaThread that tried to post the event.
>
> Webrev URL: http://cr.openjdk.java.net/~dcubed/8173693-webrev/0-jdk9-hs/
>
> Testing: Oracle internal VM/NSK JVM/TI test suite
>          JPRT testing (in progress)
>
>
> Thanks, in advance, for any comments, questions or suggestions.
>
> Dan