RFR: 8231490: Ugly racy writes to ZipUtils.defaultBuf

Wed Nov 3 21:54:27 UTC 2021

This change applies the minimal fix suggested in
https://bugs.openjdk.java.net/browse/JDK-8231490.
The bug text suggests possibilities for reworking, but notes that
this change is enough to fix the data race.
Adding a regression test is probaby not feasible but we do observe
that Java TSAN no longer reports a race after the change.

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Commit messages:
 - 8231490: Fix a data race in java.util.zip.Inflater

Changes: https://git.openjdk.java.net/jdk/pull/6242/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6242&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8231490
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6242.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6242/head:pull/6242

PR: https://git.openjdk.java.net/jdk/pull/6242