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  1. JDK
  2. JDK-8314935

Shenandoah: Unable to throw OOME on back-to-back Full GCs

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    • gc
    • b15

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        If you run existing tier1 tests with Shenandoah, then this would show up:

        ```
        % CONF=macosx-aarch64-server-fastdebug make test TEST=runtime/ClassInitErrors/TestOutOfMemoryDuringInit.java TEST_VM_OPTS="-Xlog:gc:file=/tmp/gc.log -XX:+UseShenandoahGC"

        ...


        TEST RESULT: Error. Program `/Users/shipilev/Work/shipilev-jdk/build/macosx-aarch64-server-fastdebug/images/jdk/bin/java' timed out (timeout set to 480000ms, elapsed time including timeout handling was 491523ms).
        ```

        The GC log would give the never-ending cycle of Full GCs, never actually throwing OOME:

        ```
        [48.620s][info][gc] Trigger: Handle Allocation Failure
        [49.001s][info][gc] GC(64) Cancelling GC: Allocation Failure During Evacuation
        [49.002s][info][gc] GC(64) Cannot finish degeneration, upgrading to Full GC
        [49.522s][info][gc] GC(64) Pause Degenerated GC (Outside of Cycle) 62M->62M(64M) 901.858ms
        [49.522s][info][gc] Failed to allocate TLAB, 3096B
        [49.522s][info][gc] Cancelling GC: Allocation Failure
        [49.523s][info][gc] Trigger: Handle Allocation Failure
        [49.921s][info][gc] GC(65) Cancelling GC: Allocation Failure During Evacuation
        [49.923s][info][gc] GC(65) Cannot finish degeneration, upgrading to Full GC
        [50.389s][info][gc] GC(65) Pause Degenerated GC (Outside of Cycle) 62M->62M(64M) 865.560ms
        [50.389s][info][gc] Failed to allocate Shared, 24B
        [50.389s][info][gc] Cancelling GC: Allocation Failure
        [50.390s][info][gc] Trigger: Handle Allocation Failure
        [50.908s][info][gc] GC(66) Pause Full 62M->62M(64M) 517.640ms
        [50.908s][info][gc] Failed to allocate TLAB, 3184B
        [50.908s][info][gc] Cancelling GC: Allocation Failure
        [50.910s][info][gc] Trigger: Handle Allocation Failure
        ```

        Similar thing seems to happen with `compiler/uncommontrap/TestDeoptOOM.java`

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                wkemper William Kemper
                shade Aleksey Shipilev
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                  Created:
                  Updated:
                  Resolved: