[jdk11u-dev] RFR: 8274338: com/sun/jdi/RedefineCrossEvent.java failed "assert(m != __null) failed: NULL mirror" [v2]

[Zhengyu Gu]

> Backport for parity with Oracle 11.0.15.
> 
> The original patch applies cleanly, but some of CDS tests fail due to following new assertion in `ClassLoaderData::loaded_classes_do()`
> 
> `  // To call this, one must have the MultiArray_lock held, but the _klasses list still has lock free reads.
>   assert_locked_or_safepoint(MultiArray_lock);
> `
> The solution is to take `MultiArray_lock` in `MetaspaceShared::link_and_cleanup_shared_classes()` method
> 
> Test:
> - [x]  tier1

Zhengyu Gu has updated the pull request incrementally with one additional commit since the last revision:

  @phohensee's comment

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/584/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/584/files/b600af8f..66b11d14

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=584&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=584&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/584.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/584/head:pull/584

PR: https://git.openjdk.java.net/jdk11u-dev/pull/584