[Bug 2109015] Re: openjdk JTREG test failures on s390x zEDC

[Frank Heimes]

** Also affects: ubuntu-z-systems
   Importance: Undecided
       Status: New

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => bugproxy (bugproxy)

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Title:
  openjdk JTREG test failures on s390x zEDC

Status in Ubuntu on IBM z Systems:
  New
Status in openjdk-21 package in Ubuntu:
  New

Bug description:
  While building the April 2025 OpenJDK security updates, various JTREG
  (regression) tests that use zlib have failed. The failures are
  consistent and most probably related to hardware-accelerated
  compression using zEDC on s390x.

  The following failures have been observed with openjdk-* packages:

  FAILED: java/util/zip/ZipFile/CopyJar.java
  FAILED: java/util/zip/CloseInflaterDeflaterTest.java
  FAILED: tools/pack200/PackTestZip64.java
  FAILED: tools/jmod/hashes/HashesTest.java
  FAILED: sun/security/tools/jarsigner/PreserveRawManifestEntryAndDigest.java
  FAILED: java/util/zip/DeInflate.java
  FAILED: java/util/zip/CloseInflaterDeflaterTest.java
  FAILED: tools/jlink/JLinkReproducibleTest.java
  FAILED: java/util/zip/CloseInflaterDeflaterTest.java
  FAILED: tools/jlink/JLinkReproducibleTest.java
  FAILED: tools/jar/modularJar/JarToolModuleDescriptorReproducibilityTest.java

  I confirm that all of these tests pass with environment variable
  DFLTCC=0,  which disables hardware-accelerated compression. This in
  turn points to an issue with hardware-acceleration on s390x.

  Last month, I noted a similar failure in the Java's TCK test-suite
  [1].

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