MiniMix_3h hang

[pshipton]

https://openj9-jenkins.osuosl.org/job/Test_openjdk11_j9_special.system_x86-64_linux_Release_testList_4/34
MiniMix_3h_0

https://openj9-artifactory.osuosl.org/artifactory/ci-openj9/Test/Test_openjdk11_j9_special.system_x86-64_linux_Release_testList_4/34/system_test_output.tar.gz

LT  16:37:55.464 - Completed 81.1%. Number of tests started=1297758 (+0)
LT  16:38:00.778 - **POSSIBLE HANG DETECTED**

It's likely the following, all the load threads are waiting on load-7.

2LKMONINUSE      sys_mon_t:0x00007F8540002F78 infl_mon_t: 0x00007F8540002FF8:
3LKMONOBJECT       net/adoptopenjdk/test/concurrent/support/jsr166y/WaiterTask@0x0000000088D05BF0: <unowned>
3LKNOTIFYQ            Waiting to be notified:
3LKWAITNOTIFY            "load-7" (J9VMThread:0x0000000000539E00)

3XMTHREADINFO      "load-7" J9VMThread:0x0000000000539E00, omrthread_t:0x00007F85C04F3EB8, java/lang/Thread:0x000000008358B970, state:CW, prio=5
3XMJAVALTHREAD            (java/lang/Thread getId:0x1E, isDaemon:false)
3XMJAVALTHRCCL            jdk/internal/loader/ClassLoaders$AppClassLoader(0x000000008302B3D8)
3XMTHREADINFO1            (native thread ID:0x54B, native priority:0x5, native policy:UNKNOWN, vmstate:CW, vm thread flags:0x00000181)
3XMTHREADINFO2            (native stack address range from:0x00007F859E307000, to:0x00007F859E348000, size:0x41000)
3XMCPUTIME               CPU usage total: 2145.199472425 secs, current category="Application"
3XMTHREADBLOCK     Waiting on: net/adoptopenjdk/test/concurrent/support/jsr166y/WaiterTask@0x0000000088D05BF0 Owned by: <unowned>
3XMHEAPALLOC             Heap bytes allocated since last GC cycle=0 (0x0)
3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at java/lang/Object.wait(Native Method)
4XESTACKTRACE                at java/lang/Object.wait(Object.java:219(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinTask.externalAwaitDone(ForkJoinTask.java:330(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinTask.doJoin(ForkJoinTask.java:398(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinTask.join(ForkJoinTask.java:721(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinPool.invoke(ForkJoinPool.java:2423)
4XESTACKTRACE                at net/adoptopenjdk/test/concurrent/jsr166y/ForkJoinPoolTest.testAPI(ForkJoinPoolTest.java:229(Compiled Code))

3XMTHREADINFO      "ForkJoinPool-1-worker-1" J9VMThread:0x0000000000BDE100, omrthread_t:0x00007F852A22D938, java/lang/Thread:0x0000000088CCF790, state:CW, prio=5
3XMJAVALTHREAD            (java/lang/Thread getId:0xA9FD, isDaemon:true)
3XMJAVALTHRCCL            jdk/internal/loader/ClassLoaders$AppClassLoader(0x000000008302B3D8)
3XMTHREADINFO1            (native thread ID:0x38A9, native priority:0x5, native policy:UNKNOWN, vmstate:CW, vm thread flags:0x00000481)
3XMTHREADINFO2            (native stack address range from:0x00007F853D2B1000, to:0x00007F853D2F2000, size:0x41000)
3XMCPUTIME               CPU usage total: 0.116171191 secs, current category="Application"
3XMHEAPALLOC             Heap bytes allocated since last GC cycle=0 (0x0)
3XMTHREADINFO3           Java callstack:
4XESTACKTRACE                at java/lang/Thread.sleepImpl(Native Method)
4XESTACKTRACE                at java/lang/Thread.sleep(Thread.java:991(Compiled Code))
4XESTACKTRACE                at java/lang/Thread.sleep(Thread.java:974(Compiled Code))
4XESTACKTRACE                at net/adoptopenjdk/test/concurrent/support/jsr166y/WaiterTask.exec(WaiterTask.java:74(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinTask.doExec(ForkJoinTask.java:290(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinPool.scan(ForkJoinPool.java:1656(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinPool.runWorker(ForkJoinPool.java:1594(Compiled Code))
4XESTACKTRACE                at java/util/concurrent/ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)

[pshipton]

Closing as dup of #11868