Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8241081

Shenandoah: Do not modify update-watermark concurrently

    XMLWordPrintable

    Details

    • Subcomponent:
      gc
    • Resolved In Build:
      b15
    • CPU:
      generic
    • OS:
      generic
    • Verification:
      Not verified

      Backports

        Description

        JDK-8240873 introduced short-cutting arraycopy-barriers on objects beyond the update-watermark. Concurrently updating the update-watermark after a region has been completely updated proves problematic: we see various different crashes related to this. Strengthening the fences around it doesn't fully solve the problem, apparently the problem is deeper. It doesn't seem worth to keep doing this for very little gain.

          Attachments

            Issue Links

            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8243601 Shenandoah: Do not modify update-watermark concurrently

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved
            relates to

            Enhancement - null JDK-8240873 Shenandoah: Short-cut arraycopy barriers

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

              Activity

                People

                Assignee:
                rkennke Roman Kennke
                Reporter:
                rkennke Roman Kennke
                Votes:
                0 Vote for this issue
                Watchers:
                3 Start watching this issue

                  Dates

                  Created:
                  Updated:
                  Resolved: