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  1. JDK
  2. JDK-8241071

Generation of classes.jsa with -Xshare:dump is not deterministic

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    • b22

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      In the effort of creating a reproducible build, we have so far turned a blind eye towards classes.jsa, since the generated binary is different every time.

      The most common causes for this kind of issues are binary formats that contains raw, unsorted dumps of hash maps, and timestamps. Fixing the output so it remains stable upon repeated runs on the same environment makes it possible to verify the consistency of the build.

      In some rare cases, there have been other bugs hiding in non-determinism. It is also good to be sure that the cause for non-determinism in classes.jsa is not such a bug.

      I'm currently making a change in the build system, where I'd like to be more sure that I do not affect the content of classes.jsa. So if this is possible to fix relatively soon, I'd be very happy.

      ----
      Review thread: http://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2020-April/039135.html
      ----
      For debugging determinism issues with classes.jsa, see https://wiki.openjdk.java.net/display/HotSpot/Debugging+CDS+DeterministicDump.java+test+failures

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          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. JDK-8243936 NonWriteable system properties are actually writeable

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8241271 Make hotspot build reproducible

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          relates to

          Bug - A problem which impairs or prevents the functions of the product. JDK-8245335 [TESTBUG] DeterministicDump.java fails with release JVM

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8244489 Zero and minimal VM build failure after JDK-8241071 (MetaspaceShared::symbol_space_alloc is undefined)

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8244536 cds/DeterministicDump.java failed: File content different

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Enhancement - null JDK-8275867 Make ImmutableCollections deterministic if running with TraceBytecodes/StopInterpreterAt

          • P4 - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

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              iklam Ioi Lam
              ihse Magnus Ihse Bursie
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