[15] RFR(T) 8237017: Shenandoah: Remove racy assertion

Roman Kennke rkennke at redhat.com
Mon Jan 13 16:24:49 UTC 2020

Yes please remove that.


> During concurrent weak root processing, it tries to CAS in NULL if the
> oop is dead, then asserts that the slot is indeed NULL.
> The assertion is racy, because there can be another thread to release
> the slot and then reuse it (that's why it uses CAS in the first place),
> that can result assertion to fail.
> Bug: https://bugs.openjdk.java.net/browse/JDK-8237017
> Webrev: http://cr.openjdk.java.net/~zgu/JDK-8237017/webrev.00/index.html
> Test:
>   hotspot_gc_shenandoah fastdebug on x86_64 Linux
> Thanks,
> -Zhengyu

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