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  1. JDK
  2. JDK-8282704

runtime/Thread/StopAtExit.java may leak memory

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    • b15

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        In my recent stress testing of jdk-19 bits, I've run into
        StressWrapper_StopAtExit possibly leaking memory.

        I added an RSS monitor for the StressWrappers to my stress
        kit setup and captured RSS data in my jdk-19+10 stress testing.
        I wrote a script to extract the RSS data and another script to do
        some initial analysis on that data.

        In do_all_check_stress_results.jdk-19+10_1.log:

        StressWrapper_StopAtExit release:
        n_values=101
        max_value=13102752
        min_value=80516
        max_increase=542264
        min_increase=780
        Value increased 100 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 release:
        n_values=102
        max_value=260024
        min_value=43676
        max_increase=17628
        min_increase=8436
        Value increased 101 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 fastdebug:
        n_values=101
        max_value=431132
        min_value=193884
        max_increase=18416
        min_increase=6908
        Value increased 100 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 slowdebug:
        n_values=74
        max_value=1019140
        min_value=203728
        max_increase=29192
        min_increase=13156
        Value increased 73 times
        WARNING: there might be a leak.


        In do_all_check_stress_results.jdk-19+10_2.log:

        StressWrapper_suspendthrd003 release:
        n_values=102
        max_value=326184
        min_value=45896
        max_increase=18260
        min_increase=11096
        Value increased 101 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 fastdebug:
        n_values=102
        max_value=478212
        min_value=193176
        max_increase=18756
        min_increase=5872
        Value increased 101 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 slowdebug:
        n_values=74
        max_value=1029096
        min_value=198076
        max_increase=27360
        min_increase=13056
        Value increased 73 times
        WARNING: there might be a leak.


        do_all_check_stress_results.jdk-19+10_3.log:

        StressWrapper_StopAtExit release:
        n_values=101
        max_value=13230152
        min_value=78128
        max_increase=532040
        min_increase=1764
        Value increased 100 times
        WARNING: there might be a leak.


        StressWrapper_suspendthrd003 release:
        n_values=102
        max_value=173640
        min_value=42908
        max_increase=10428
        min_increase=10428
        Value increased 101 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 fastdebug:
        n_values=101
        max_value=479636
        min_value=193480
        max_increase=18764
        min_increase=5864
        Value increased 100 times
        WARNING: there might be a leak.

        StressWrapper_suspendthrd003 slowdebug:
        n_values=75
        max_value=1032804
        min_value=204916
        max_increase=29068
        min_increase=12572
        Value increased 74 times
        WARNING: there might be a leak.

        The StressWrapper_suspendthrd003 leak is being investigated via:

            JDK-8282314 nsk/jvmti/SuspendThread/suspendthrd003 may leak memory

        StressWrapper_StopAtExit did report a possible leak in
        the 'release' bits config in 2 of the 3 runs so I'm not as
        sure that is a real sighting. However, I need to investigate
        so I've filed this bug for that purpose.

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                dcubed Daniel Daugherty
                dcubed Daniel Daugherty
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                  Created:
                  Updated:
                  Resolved: