Test serviceability/sa/TestJhsdbJstackLock.java *highly* intermittently fail to find expected line in jhsdb output.

The log is:

'LingeredAppWithLock' '0b023fa7-6163-484a-8e84-c3293d499b1e.lck' ]

 stdout: [Attaching to process ID 46496, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 12-ea+10
Deadlock Detection:

No deadlocks found.

"Thread-3" #16 prio=5 tid=0x000000b3703d2000 nid=0x3b68 waiting on condition [0x000000b37165f000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
   JavaThread state: _thread_blocked
 - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame)
 - LingeredAppWithLock.lockMethod(java.lang.Object) @bci=7, line=32 (Interpreted frame)
- locked <0x0000000754100010> (a java.lang.Class for int)
 - LingeredAppWithLock.lambda$main$3() @bci=3, line=43 (Interpreted frame)
 - LingeredAppWithLock$$Lambda$4.run() @bci=0 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=834 (Interpreted frame)


"Thread-2" #15 prio=5 tid=0x000000b3703d1800 nid=0x6c34 waiting on condition [0x000000b37155e000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
   JavaThread state: _thread_blocked
 - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame)
 - LingeredAppWithLock.lockMethod(java.lang.Object) @bci=7, line=32 (Interpreted frame)
- locked <0x00000007540303f8> (a java.lang.Thread)
 - LingeredAppWithLock.lambda$main$2(java.lang.Thread) @bci=1, line=42 (Interpreted frame)
 - LingeredAppWithLock$$Lambda$3.run() @bci=4 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=834 (Interpreted frame)


"Thread-1" #14 prio=5 tid=0x000000b370384800 nid=0x9b88 waiting on condition [0x000000b37145f000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
   JavaThread state: _thread_blocked
 - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame)
 - LingeredAppWithLock.lockMethod(java.lang.Object) @bci=7, line=32 (Interpreted frame)
- locked <0x000000075402e508> (a java.lang.Class for LingeredAppWithLock)
 - LingeredAppWithLock.lambda$main$0() @bci=2, line=40 (Interpreted frame)
 - LingeredAppWithLock$$Lambda$2.run() @bci=0 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=834 (Interpreted frame)


"Thread-0" #13 prio=5 tid=0x000000b370381800 nid=0x707c waiting for monitor entry [0x000000b37135f000]
   java.lang.Thread.State: BLOCKED (on object monitor)
   JavaThread state: _thread_blocked
 - LingeredAppWithLock.lambda$main$0() @bci=2, line=40 (Interpreted frame)
 - LingeredAppWithLock$$Lambda$1.run() @bci=0 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=834 (Interpreted frame)


"Common-Cleaner" #12 daemon prio=8 tid=0x000000b37034f000 nid=0x6580 in Object.wait() [0x000000b37125e000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
   JavaThread state: _thread_blocked
 - java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- waiting on <0x00000007540216d0> (a java.lang.ref.ReferenceQueue$Lock)
 - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=155 (Interpreted frame)
- waiting to re-lock in wait() <0x00000007540216d0> (a java.lang.ref.ReferenceQueue$Lock)
 - jdk.internal.ref.CleanerImpl.run() @bci=65, line=148 (Interpreted frame)
 - java.lang.Thread.run() @bci=11, line=834 (Interpreted frame)
 - jdk.internal.misc.InnocuousThread.run() @bci=20, line=134 (Interpreted frame)


"Attach Listener" #5 daemon prio=5 tid=0x000000b37001c000 nid=0x6bc0 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE
   JavaThread state: _thread_blocked


"Signal Dispatcher" #4 daemon prio=9 tid=0x000000b370019800 nid=0x5f94 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE
   JavaThread state: _thread_blocked


"Finalizer" #3 daemon prio=8 tid=0x000000b36ffb3800 nid=0x28bc in Object.wait() [0x000000b37097f000]
   java.lang.Thread.State: WAITING (on object monitor)
   JavaThread state: _thread_blocked
 - java.lang.Object.wait(long) @bci=0 (Interpreted frame)
- waiting on <0x0000000754108f10> (a java.lang.ref.ReferenceQueue$Lock)
 - java.lang.ref.ReferenceQueue.remove(long) @bci=59, line=155 (Interpreted frame)
- waiting to re-lock in wait() <0x0000000754108f10> (a java.lang.ref.ReferenceQueue$Lock)
 - java.lang.ref.ReferenceQueue.remove() @bci=2, line=176 (Interpreted frame)
 - java.lang.ref.Finalizer$FinalizerThread.run() @bci=37, line=170 (Interpreted frame)


"Reference Handler" #2 daemon prio=10 tid=0x000000b36ffa9800 nid=0x7028 waiting on condition [0x000000b37087e000]
   java.lang.Thread.State: RUNNABLE
   JavaThread state: _thread_blocked
 - java.lang.ref.Reference.waitForReferencePendingList() @bci=0 (Interpreted frame)
 - java.lang.ref.Reference.processPendingReferences() @bci=0, line=241 (Interpreted frame)
 - java.lang.ref.Reference$ReferenceHandler.run() @bci=0, line=213 (Interpreted frame)


"main" #1 prio=5 tid=0x000000b34c1a5800 nid=0x1204 waiting on condition [0x000000b34b94f000]
   java.lang.Thread.State: TIMED_WAITING (sleeping)
   JavaThread state: _thread_blocked
 - java.lang.Thread.sleep(long) @bci=0 (Interpreted frame)
 - jdk.test.lib.apps.LingeredApp.main(java.lang.String[]) @bci=53, line=498 (Interpreted frame)
 - LingeredAppWithLock.main(java.lang.String[]) @bci=72, line=50 (Interpreted frame)


];
 stderr: []
 exitValue = 0

 LingeredApp stdout: [];
 LingeredApp stderr: []
 LingeredApp exitValue = 0
java.lang.RuntimeException: '^\\s+- waiting to lock <0x[0-9a-f]+> \\(a java\\.lang\\.Class for LingeredAppWithLock\\)$' missing from stdout/stderr

at jdk.test.lib.process.OutputAnalyzer.shouldMatch(OutputAnalyzer.java:258)
at TestJhsdbJstackLock.main(TestJhsdbJstackLock.java:76)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:834)

JavaTest Message: Test threw exception: java.lang.RuntimeException: '^\\s+- waiting to lock <0x[0-9a-f]+> \\(a java\\.lang\\.Class for LingeredAppWithLock\\)$' missing from stdout/stderr