Bug ID: JDK-8364082 jdk/jfr/event/gc/heapsummary/TestHeapSummaryEventPSParOld.java Eden should be placed first in young

Type: Bug
Component: hotspot
Sub-Component: jfr
Affected Version: 26
Priority: P2
Status: Resolved
Resolution: Fixed
OS: generic
CPU: generic
Submitted: 2025-07-24
Updated: 2025-08-02
Resolved: 2025-07-25
JDK 26
26 b09Fixed
The following test failed in the JDK26 CI:

jdk/jfr/event/gc/heapsummary/TestHeapSummaryEventPSParOld.java

Here's a snippet from the log file:

#section:main
----------messages:(8/581)----------
command: main -XX:+UnlockExperimentalVMOptions -XX:-UseFastUnorderedTimeStamps -XX:+UseParallelGC jdk.jfr.event.gc.heapsummary.TestHeapSummaryEventPSParOld
reason: User specified action: run main/othervm -XX:+UnlockExperimentalVMOptions -XX:-UseFastUnorderedTimeStamps -XX:+UseParallelGC jdk.jfr.event.gc.heapsummary.TestHeapSummaryEventPSParOld 
started: Thu Jul 24 17:32:33 UTC 2025
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.jfr,java.management
Process id: 3547548
finished: Thu Jul 24 17:32:34 UTC 2025
elapsed time (seconds): 0.435
----------configuration:(3/51)----------
Boot Layer
  add modules: jdk.jfr java.management

----------System.out:(498/8976)----------
Event:jdk.GCHeapSummary {
  startTime = 17:32:34.044 (2025-07-24)
  gcId = 1
  when = "Before GC"
  heapSpace = {
    start = 0xD0000000
    committedEnd = 0xE6480000
    committedSize = 356.5 MB
    reservedEnd = 0x100000000
    reservedSize = 768.0 MB
  }
  heapUsed = 4.7 MB
}


Event:jdk.PSHeapSummary {
  startTime = 17:32:34.044 (2025-07-24)
  gcId = 1
  when = "Before GC"
  oldSpace = {
    start = 0xD0000000
    committedEnd = 0xDF800000
    committedSize = 248.0 MB
    reservedEnd = 0xF0000000
    reservedSize = 512.0 MB
  }
  oldObjectSpace = {
    start = 0xD0000000
    end = 0xDF800000
    used = 2.8 MB
    size = 248.0 MB
  }
  youngSpace = {
    start = 0xF0000000
    committedEnd = 0xF7C00000
    committedSize = 124.0 MB
    reservedEnd = 0x100000000
    reservedSize = 256.0 MB
  }
  edenSpace = {
    start = 0xF1F00000
    end = 0xF7C00000
    used = 1.9 MB
    size = 93.0 MB
  }
  fromSpace = {
    start = 0xF0F80000
    end = 0xF1F00000
    used = 0 bytes
    size = 15.5 MB
  }
  toSpace = {
    start = 0xF0000000
    end = 0xF0F80000
    used = 0 bytes
    size = 15.5 MB
  }
}


Event:jdk.MetaspaceSummary {
  startTime = 17:32:34.044 (2025-07-24)
  gcId = 1
  when = "Before GC"
  gcThreshold = 21.0 MB
  metaspace = {
    committed = 2.9 MB
    used = 2.7 MB
    reserved = 1.1 GB
  }
  dataSpace = {
    committed = 2.6 MB
    used = 2.5 MB
    reserved = 64.0 MB
  }
  classSpace = {
    committed = 320.0 kB
    used = 235.6 kB
    reserved = 1.0 GB
  }
}


Event:jdk.GCHeapSummary {
  startTime = 17:32:34.050 (2025-07-24)
  gcId = 1
  when = "After GC"
  heapSpace = {
    start = 0xD0000000
    committedEnd = 0xE6480000
    committedSize = 356.5 MB
    reservedEnd = 0x100000000
    reservedSize = 768.0 MB
  }
  heapUsed = 2.8 MB
}


Event:jdk.PSHeapSummary {
  startTime = 17:32:34.050 (2025-07-24)
  gcId = 1
  when = "After GC"
  oldSpace = {
    start = 0xD0000000
    committedEnd = 0xDF800000
    committedSize = 248.0 MB
    reservedEnd = 0xF0000000
    reservedSize = 512.0 MB
  }
  oldObjectSpace = {
    start = 0xD0000000
    end = 0xDF800000
    used = 2.8 MB
    size = 248.0 MB
  }
  youngSpace = {
    start = 0xF0000000
    committedEnd = 0xF7C00000
    committedSize = 124.0 MB
    reservedEnd = 0x100000000
    reservedSize = 256.0 MB
  }
  edenSpace = {
    start = 0xF1F00000
    end = 0xF7C00000
    used = 0 bytes
    size = 93.0 MB
  }
  fromSpace = {
    start = 0xF0F80000
    end = 0xF1F00000
    used = 0 bytes
    size = 15.5 MB
  }
  toSpace = {
    start = 0xF0000000
    end = 0xF0F80000
    used = 0 bytes
    size = 15.5 MB
  }
}


Event:jdk.MetaspaceSummary {
  startTime = 17:32:34.050 (2025-07-24)
  gcId = 1
  when = "After GC"
  gcThreshold = 21.0 MB
  metaspace = {
    committed = 2.9 MB
    used = 2.7 MB
    reserved = 1.1 GB
  }
  dataSpace = {
    committed = 2.6 MB
    used = 2.5 MB
    reserved = 64.0 MB
  }
  classSpace = {
    committed = 320.0 kB
    used = 235.6 kB
    reserved = 1.0 GB
  }
}


Event:jdk.GCHeapSummary {
  startTime = 17:32:34.050 (2025-07-24)
  gcId = 2
  when = "Before GC"
  heapSpace = {
    start = 0xD0000000
    committedEnd = 0xE6480000
    committedSize = 356.5 MB
    reservedEnd = 0x100000000
    reservedSize = 768.0 MB
  }
  heapUsed = 4.7 MB
}


Event:jdk.PSHeapSummary {
  startTime = 17:32:34.050 (2025-07-24)
  gcId = 2
  when = "Before GC"
  oldSpace = {
    start = 0xD0000000
    committedEnd = 0xDF800000
    committedSize = 248.0 MB
    reservedEnd = 0xF0000000
    reservedSize = 512.0 MB
  }
  oldObjectSpace = {
    start = 0xD0000000
    end = 0xDF800000
    used = 2.8 MB
    size = 248.0 MB
  }
  youngSpace = {
    start = 0xF0000000
    committedEnd = 0xF7C00000
    committedSize = 124.0 MB
    reservedEnd = 0x100000000
    reservedSize = 256.0 MB
  }
  edenSpace = {
    start = 0xF1F00000
    end = 0xF7C00000
    used = 1.9 MB
    size = 93.0 MB
  }
  fromSpace = {
    start = 0xF0F80000
    end = 0xF1F00000
    used = 0 bytes
    size = 15.5 MB
  }
  toSpace = {
    start = 0xF0000000
    end = 0xF0F80000
    used = 0 bytes
    size = 15.5 MB
  }
}


Event:jdk.MetaspaceSummary {
  startTime = 17:32:34.050 (2025-07-24)
  gcId = 2
  when = "Before GC"
  gcThreshold = 21.0 MB
  metaspace = {
    committed = 2.9 MB
    used = 2.7 MB
    reserved = 1.1 GB
  }
  dataSpace = {
    committed = 2.6 MB
    used = 2.5 MB
    reserved = 64.0 MB
  }
  classSpace = {
    committed = 320.0 kB
    used = 235.6 kB
    reserved = 1.0 GB
  }
}


Event:jdk.GCHeapSummary {
  startTime = 17:32:34.057 (2025-07-24)
  gcId = 2
  when = "After GC"
  heapSpace = {
    start = 0xD0000000
    committedEnd = 0xE6480000
    committedSize = 356.5 MB
    reservedEnd = 0x100000000
    reservedSize = 768.0 MB
  }
  heapUsed = 2.8 MB
}


Event:jdk.PSHeapSummary {
  startTime = 17:32:34.057 (2025-07-24)
  gcId = 2
  when = "After GC"
  oldSpace = {
    start = 0xD0000000
    committedEnd = 0xDF800000
    committedSize = 248.0 MB
    reservedEnd = 0xF0000000
    reservedSize = 512.0 MB
  }
  oldObjectSpace = {
    start = 0xD0000000
    end = 0xDF800000
    used = 2.8 MB
    size = 248.0 MB
  }
  youngSpace = {
    start = 0xF0000000
    committedEnd = 0xF7C00000
    committedSize = 124.0 MB
    reservedEnd = 0x100000000
    reservedSize = 256.0 MB
  }
  edenSpace = {
    start = 0xF1F00000
    end = 0xF7C00000
    used = 0 bytes
    size = 93.0 MB
  }
  fromSpace = {
    start = 0xF0F80000
    end = 0xF1F00000
    used = 0 bytes
    size = 15.5 MB
  }
  toSpace = {
    start = 0xF0000000
    end = 0xF0F80000
    used = 0 bytes
    size = 15.5 MB
  }
}


Event:jdk.MetaspaceSummary {
  startTime = 17:32:34.057 (2025-07-24)
  gcId = 2
  when = "After GC"
  gcThreshold = 21.0 MB
  metaspace = {
    committed = 2.9 MB
    used = 2.7 MB
    reserved = 1.1 GB
  }
  dataSpace = {
    committed = 2.6 MB
    used = 2.5 MB
    reserved = 64.0 MB
  }
  classSpace = {
    committed = 320.0 kB
    used = 235.6 kB
    reserved = 1.0 GB
  }
}


Event:jdk.GCHeapSummary {
  startTime = 17:32:34.057 (2025-07-24)
  gcId = 3
  when = "Before GC"
  heapSpace = {
    start = 0xD0000000
    committedEnd = 0xE6480000
    committedSize = 356.5 MB
    reservedEnd = 0x100000000
    reservedSize = 768.0 MB
  }
  heapUsed = 4.7 MB
}


Event:jdk.PSHeapSummary {
  startTime = 17:32:34.057 (2025-07-24)
  gcId = 3
  when = "Before GC"
  oldSpace = {
    start = 0xD0000000
    committedEnd = 0xDF800000
    committedSize = 248.0 MB
    reservedEnd = 0xF0000000
    reservedSize = 512.0 MB
  }
  oldObjectSpace = {
    start = 0xD0000000
    end = 0xDF800000
    used = 2.8 MB
    size = 248.0 MB
  }
  youngSpace = {
    start = 0xF0000000
    committedEnd = 0xF7C00000
    committedSize = 124.0 MB
    reservedEnd = 0x100000000
    reservedSize = 256.0 MB
  }
  edenSpace = {
    start = 0xF1F00000
    end = 0xF7C00000
    used = 1.9 MB
    size = 93.0 MB
  }
  fromSpace = {
    start = 0xF0F80000
    end = 0xF1F00000
    used = 0 bytes
    size = 15.5 MB
  }
  toSpace = {
    start = 0xF0000000
    end = 0xF0F80000
    used = 0 bytes
    size = 15.5 MB
  }
}


Event:jdk.MetaspaceSummary {
  startTime = 17:32:34.057 (2025-07-24)
  gcId = 3
  when = "Before GC"
  gcThreshold = 21.0 MB
  metaspace = {
    committed = 2.9 MB
    used = 2.7 MB
    reserved = 1.1 GB
  }
  dataSpace = {
    committed = 2.6 MB
    used = 2.5 MB
    reserved = 64.0 MB
  }
  classSpace = {
    committed = 320.0 kB
    used = 235.6 kB
    reserved = 1.0 GB
  }
}


Event:jdk.GCHeapSummary {
  startTime = 17:32:34.066 (2025-07-24)
  gcId = 3
  when = "After GC"
  heapSpace = {
    start = 0xD0000000
    committedEnd = 0xE6480000
    committedSize = 356.5 MB
    reservedEnd = 0x100000000
    reservedSize = 768.0 MB
  }
  heapUsed = 2.8 MB
}


Event:jdk.PSHeapSummary {
  startTime = 17:32:34.066 (2025-07-24)
  gcId = 3
  when = "After GC"
  oldSpace = {
    start = 0xD0000000
    committedEnd = 0xDF800000
    committedSize = 248.0 MB
    reservedEnd = 0xF0000000
    reservedSize = 512.0 MB
  }
  oldObjectSpace = {
    start = 0xD0000000
    end = 0xDF800000
    used = 2.8 MB
    size = 248.0 MB
  }
  youngSpace = {
    start = 0xF0000000
    committedEnd = 0xF7C00000
    committedSize = 124.0 MB
    reservedEnd = 0x100000000
    reservedSize = 256.0 MB
  }
  edenSpace = {
    start = 0xF1F00000
    end = 0xF7C00000
    used = 0 bytes
    size = 93.0 MB
  }
  fromSpace = {
    start = 0xF0F80000
    end = 0xF1F00000
    used = 0 bytes
    size = 15.5 MB
  }
  toSpace = {
    start = 0xF0000000
    end = 0xF0F80000
    used = 0 bytes
    size = 15.5 MB
  }
}


Event:jdk.MetaspaceSummary {
  startTime = 17:32:34.066 (2025-07-24)
  gcId = 3
  when = "After GC"
  gcThreshold = 21.0 MB
  metaspace = {
    committed = 2.9 MB
    used = 2.7 MB
    reserved = 1.1 GB
  }
  dataSpace = {
    committed = 2.6 MB
    used = 2.5 MB
    reserved = 64.0 MB
  }
  classSpace = {
    committed = 320.0 kB
    used = 235.6 kB
    reserved = 1.0 GB
  }
}


----------System.err:(16/1260)----------
java.lang.RuntimeException: Eden should be placed first in young expected: 4026531840 but was: 4059037696
	at jdk.test.lib.Asserts.fail(Asserts.java:715)
	at jdk.test.lib.Asserts.assertEquals(Asserts.java:208)
	at jdk.jfr.event.gc.heapsummary.HeapSummaryEventAllGcs.checkPSYoungStartEnd(HeapSummaryEventAllGcs.java:164)
	at jdk.jfr.event.gc.heapsummary.HeapSummaryEventAllGcs.checkPSEventContent(HeapSummaryEventAllGcs.java:138)
	at jdk.jfr.event.gc.heapsummary.HeapSummaryEventAllGcs.test(HeapSummaryEventAllGcs.java:76)
	at jdk.jfr.event.gc.heapsummary.TestHeapSummaryEventPSParOld.main(TestHeapSummaryEventPSParOld.java:37)
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
	at java.base/java.lang.reflect.Method.invoke(Method.java:565)
	at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
	at java.base/java.lang.Thread.run(Thread.java:1474)

JavaTest Message: Test threw exception: java.lang.RuntimeException: Eden should be placed first in young expected: 4026531840 but was: 4059037696
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: Eden should be placed first in young expected: 4026531840 but was: 4059037696
----------rerun:(44/8480)*----------
The fix for this issue is integrated in jdk-26+9-838.
25-07-2025
Changeset: 52155dbb Branch: master Author: Albert Mingkun Yang <ayang@openjdk.org> Date: 2025-07-25 07:22:34 +0000 URL: https://git.openjdk.org/jdk/commit/52155dbbb0107c5077a6be7edfd91d4311411fc3
25-07-2025
A pull request was submitted for review. Branch: master URL: https://git.openjdk.org/jdk/pull/26466 Date: 2025-07-24 18:59:15 +0000
24-07-2025
Bumping from P4 -> P2. Normally I would bump from P4 -> P3 since this appears to be a solid 5 failures per Tier3. However, this also appears to be a regression and we start those out at P2.
24-07-2025