During `java -Xshare:dump -XX:-UseCompressedOops`, the location of the Java heap is chosen by the OS. Due to Address Space Layout Randomization, the heap will always start at a different location. This causes the archive for uncompressed oops ($JAVA_HOME/lib/server/classes_nocoops.jsa) to be non-deterministic.
The fix is to patch the archived object pointers to make it look like the heap starts at a fixed address -- I chose 0x10000000, but the exact value doesn't really matter. At runtime, the object pointers will be patched again according to the real location of the heap. Tested with tiers 1-5. I am running builds-tier5 several times to test the xxx-cmp-baseline builds. ------------- Commit messages: - 8282828: CDS uncompressed oops archive is not deterministic Changes: https://git.openjdk.java.net/jdk/pull/8478/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8478&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8282828 Stats: 86 lines in 6 files changed: 62 ins; 2 del; 22 mod Patch: https://git.openjdk.java.net/jdk/pull/8478.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8478/head:pull/8478 PR: https://git.openjdk.java.net/jdk/pull/8478
