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  1. JDK
  2. JDK-8320561

Inconsistency in monitorinflation logging

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    • Bug
    • Resolution: Fixed
    • P4
    • 24
    • 22
    • hotspot
    • b09

    Description

      While investigating JDK-8320515 I noticed this inconsistency in the -Xlog:monitorinflation logging output:

      [35.415s][trace][monitorinflation] Checking in_use_list:
      [35.415s][trace][monitorinflation] count=4, max=4
      [35.415s][trace][monitorinflation] in_use_count=4 equals ck_in_use_count=4
      [35.415s][trace][monitorinflation] in_use_max=4 equals ck_in_use_max=4
      [35.415s][trace][monitorinflation] No errors found in in_use_list checks.
      [35.415s][trace][monitorinflation] In-use monitor info:
      [35.415s][trace][monitorinflation] (B -> is_busy, H -> has hash code, L -> lock status)
      [35.416s][trace][monitorinflation] monitor BHL object object type
      [35.416s][trace][monitorinflation] ================== === ================== ==================
      [35.416s][trace][monitorinflation] 0x00007efd38002190 000 0x000000041592bd78 CompleteExit$2
      [35.416s][trace][monitorinflation] 0x00007efd380020a0 000 0x000000041592bbb0 CompleteExit$1
      [35.416s][trace][monitorinflation] 0x00007efe08324bb0 010 0x000000041592a918 java.lang.Thread
      [35.416s][trace][monitorinflation] 0x00007efd640010b0 100 0x0000000415909f38 java.lang.ref.NativeReferenceQueue$Lock (is_busy: waiters=1, contentions=0, owner=0x0000000000000000, cxq=0x0000000000000000, EntryList=0x0000000000000000)
      [35.463s][info ][monitorinflation] Starting the final audit.
      [35.463s][trace][monitorinflation] Checking in_use_list:
      [35.463s][trace][monitorinflation] count=4, max=4
      [35.463s][trace][monitorinflation] in_use_count=4 equals ck_in_use_count=4
      [35.463s][trace][monitorinflation] in_use_max=4 equals ck_in_use_max=4
      [35.463s][trace][monitorinflation] No errors found in in_use_list checks.
      [35.463s][trace][monitorinflation] In-use monitor info:
      [35.463s][trace][monitorinflation] (B -> is_busy, H -> has hash code, L -> lock status)
      [35.463s][trace][monitorinflation] monitor BHL object object type
      [35.463s][trace][monitorinflation] ================== === ================== ==================
      [35.463s][trace][monitorinflation] 0x00007efd640010b0 100 0x0000000415909f38 java.lang.ref.NativeReferenceQueue$Lock (is_busy: waiters=1, contentions=0, owner=0x0000000000000000, cxq=0x0000000000000000, EntryList=0x0000000000000000)

      Note that initially we have 4 in-use monitors and we list all 4 of them. But then some are released and we only list the remaining java.lang.ref.NativeReferenceQueue$Lock monitor, but the count still says 4.

      [35.463s][trace][monitorinflation] count=4, max=4
      [35.463s][trace][monitorinflation] in_use_count=4 equals ck_in_use_count=4

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              dholmes David Holmes
              dholmes David Holmes
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