RFR 8228490: Shenandoah: Shenandoah concurrent root evacuation may race against OopStorage::release()
Zhengyu Gu
zgu at redhat.com
Wed Jul 24 15:46:04 UTC 2019
Concurrent evacuating OopStorage backed roots, may race against
OopStorage::release() calls. Therefore, it needs to update the roots
with Atomic::cmpxchg(), to avoid overwriting the roots if they are released.
Bug: https://bugs.openjdk.java.net/browse/JDK-8228490
Webrev: http://cr.openjdk.java.net/~zgu/JDK-8228490/webrev.00/index.html
Test:
hotspot_gc_shenandoah (fastdebug and release)
jcstress fastdebug
nightly tests
Thanks,
-Zhengyu
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