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[Launchpad Bug Tracker <1902029@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package openjdk-lts -
11.0.9.1+1-0ubuntu1~20.10

---------------
openjdk-lts (11.0.9.1+1-0ubuntu1~20.10) groovy-security; urgency=medium

  * Backport from Hirsute.

openjdk-lts (11.0.9.1+1-0ubuntu1) hirsute; urgency=medium

  * OpenJDK 11.0.9+11 build (release).

  [ Matthias Klose ]
  * Configure --with-jvm-features=shenandoahgc for hotspot builds.
    LP: #1902029.

  [ Tiago Stürmer Daitx ]
  * Filter out recurring failed tests.
    - debian/failed-tests-problemlist.txt: list of tests known to
      have failed in the past.
    - debian/tests/control: add zip as some tests depend on it.
    - debian/tests/hotspot, debian/tests/jaxp, debian/test/jdk,
      debian/tests/langtools: exclude tests listed as failed tests,
      exit if jtreg exits 77 as no test was actually ran.
    - debian/tests/jtreg-autopkgtest.in: reduce retries from 3 to 2,
      exit early if test results are the same on retry, output time
      along name and status.
    - debian/tests/jtreg-autopkgtest.sh: regenerated.
    - d/p/hotspot-test-fix-npe-on-missing-file.patch: recurse only
      if src file exists, fixes test when libatk is a dangling link.

openjdk-lts (11.0.9+11-0ubuntu2) hirsute; urgency=medium

  * d/p/jdk-8254982-tzdata2020c.patch: update to tzdata2020c.

 -- Tiago Stürmer Daitx <tiago.daitx@xxxxxxxxxx>  Tue, 10 Nov 2020
04:18:42 +0000

** Changed in: openjdk-lts (Ubuntu)
       Status: New => Fix Released

** Changed in: openjdk-lts (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1902029

Title:
  openjdk-lts 11.0.9+ could include Shenandoah GC on amd64

Status in openjdk-lts package in Ubuntu:
  Fix Released

Bug description:
  In OpenJDK 11.0.9, the Shenandoah GC has been backported from OpenJDK 15, and is considered "Ready for Production". References:
  https://wiki.openjdk.java.net/display/shenandoah/Main
  https://mail.openjdk.java.net/pipermail/jdk-updates-dev/2020-October/004007.html (11.0.9 release notes)
  https://bugs.openjdk.java.net/browse/JDK-8250784 (the backport issue, with pointers to review discussions)

  Just like ZGC, it is an optional feature, which must be explicitly enabled at build time. Some vendors enable it already:
  https://wiki.openjdk.java.net/display/shenandoah/Main#Main-Releases
  For instance, Fedora enables it on x86_64 (amd64), now without any specific patch (prior to 11.0.9, they were shipping the backport patch):
  https://src.fedoraproject.org/rpms/java-11-openjdk/blob/master/f/java-11-openjdk.spec

  I think Ubuntu should do the same, enable it on amd64 (just like ZGC),
  and backport to Bionic/Focal. For some use-cases, Shenandoah has
  already proved it brings valuable improvements compared to G1GC, it
  would be nice being able to use it on Ubuntu-based containers/systems
  too.

  I will attach an untested patch, just to show what I think is the
  required change to debian/rules.

  ============

  > We also need:

  > 1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  $ lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  > 2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  $ apt-cache policy openjdk-11-jre-headless
  openjdk-11-jre-headless:
    Installed: 11.0.9+11-0ubuntu1~18.04.1
    Candidate: 11.0.9+11-0ubuntu1~18.04.1
    Version table:
   *** 11.0.9+11-0ubuntu1~18.04.1 500
          500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
          100 /var/lib/dpkg/status
       10.0.1+10-3ubuntu1 500
          500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

  > 3) What you expected to happen

  $ java -XX:+UseShenandoahGC -Xlog:gc -version
  [0.004s][info][gc] Heuristics ergonomically sets -XX:+ExplicitGCInvokesConcurrent
  [0.004s][info][gc] Heuristics ergonomically sets -XX:+ShenandoahImplicitGCInvokesConcurrent
  [0.005s][info][gc] Using Shenandoah
  openjdk version "11.0.9" 2020-XX-XX
  ...

  > 4) What happened instead

  $ java -XX:+UseShenandoahGC -Xlog:gc -version
  Unrecognized VM option 'UseShenandoahGC'
  Error: Could not create the Java Virtual Machine.
  Error: A fatal exception has occurred. Program will exit.

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