8254695: G1: Next mark bitmap clear not cancelled after marking abort

[tschatzl]

Hi all,

can I have reviews for this change that fixes aborting the concurrent next bitmap clear if aborted?

The problems are that we can enter the clear loop with the marking already aborted, so

• yielding does not return true any more (marking aborted while joining the STS) and we never abort in the loop if we join all conditions together
• and G1 at least clears the first part(s) of the bitmap as the check is done afterwards

Testing: tier1-5; no more reproducable crashes with other changes (JDK-8253600)

Thanks,
Thomas

---

Progress

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Issue

• JDK-8254695: G1: Next mark bitmap clear not cancelled after marking abort

Reviewers

• Ivan Walulya (@walulyai - Author)
• Stefan Johansson (@kstefanj - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/jdk pull/653/head:pull/653
$ git checkout pull/653

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (5979faa)

[walulyai]

lgtm.

[kstefanj]

Looks good.

[openjdk]

@tschatzl This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8254695: G1: Next mark bitmap clear not cancelled after marking abort

Reviewed-by: iwalulya, sjohanss

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 47 new commits pushed to the master branch:

• 3c2f5e0: 8254674: G1: Improve root location reference to dead obj verification message
• abe5137: 8254719: ZGC: Clean up includes
• 60159cf: 8253952: Refine ZipOutputStream.putNextEntry() to recalculate ZipEntry's compressed size
• 9359ff0: 8252221: Use multiple workers for Parallel GC pre-touching
• f44fc6d: 8254734: "dead loop detected" assert failure with patch from 8223051
• 7f73474: 8254773: Remove unimplemented ciReplay::is_loaded(Klass* klass)
• 167c192: 8254771: Remove unimplemented ciSignature::get_all_klasses
• 81a8ff1: 8254769: Remove unimplemented BCEscapeAnalyzer::{add_dependence, propagate_dependencies}
• 7e5eb49: 8253402: Convert vmSymbols::SID to enum class
• 038f58d: 8226236: [TESTBUG] win32: gc/metaspace/TestCapacityUntilGCWrapAround.java fails
• ... and 37 more: https://git.openjdk.java.net/jdk/compare/90de2894e90c0808ec98857bcd562897d14e2ffb...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[tschatzl]

Thanks @kstefanj @walulyai for your reviews.

[tschatzl]

/integrate

[openjdk]

@tschatzl Since your change was applied there have been 57 commits pushed to the master branch:

• 34583eb: 8254161: Prevent instantiation of EnumSet subclasses through deserialization
• 3d23bd8: 8254814: [Vector API] Fix an AVX512 crash after JDK-8223347
• 7c0d417: 8251535: Partial peeling at unsigned test adds incorrect loop exit check
• 5145bed: 8254125: Assertion in cppVtables.cpp during builds on 32bit Windows
• bdda205: 8254369: Node::disconnect_inputs may skip precedences
• 96bb6e7: 8251325: Miss 'L' for long value in if statement
• 546620b: 8254192: ExtraSharedClassListFile contains extra white space at end of line
• f3ce45f: 8254799: runtime/ErrorHandling/TestHeapDumpOnOutOfMemoryError.java fails with release VMs
• cda22e3: 8254811: JDK-8254158 broke ppc64, s390 builds
• 8ef88e5: 8249878: jfr_emergency_dump has secondary crashes
• ... and 47 more: https://git.openjdk.java.net/jdk/compare/90de2894e90c0808ec98857bcd562897d14e2ffb...master

Your commit was automatically rebased without conflicts.

Pushed as commit 1742c44.

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