ADDITIONAL SYSTEM INFORMATION :
MacOS, Windows, Linux/ x86_64/ OpenJDK Runtime Environment 18.9 (build 11.0.12+7)

A DESCRIPTION OF THE PROBLEM :
The test test/jdk/java/awt/Robot/FlushCurrentEvent.java fails by timeout with freeze.

The issue is caused by fix for JDK-8196100

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
jtreg -v -a -testjdk:<test_jdk> test/jdk/java/awt/Robot/FlushCurrentEvent.java

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Test passed
ACTUAL -
The test failed by timeout with the following error:

```
----------messages:(154/10513)----------
command: main FlushCurrentEvent
reason: Assumed action based on file name: run main FlushCurrentEvent
Mode: othervm
Additional options from @modules: --add-modules java.desktop
Timeout information:
Running jstack on process 62746
2021-08-19 20:28:49
Full thread dump OpenJDK 64-Bit Server VM (11.0.12-internal+0-adhoc.mgrishchenko.JetBrainsRuntime mixed mode):

Threads class SMR info:
_java_thread_list=0x00007f5ca4002aa0, length=15, elements={
0x00007f5cf0028800, 0x00007f5cf020b000, 0x00007f5cf020f000, 0x00007f5cf0224000,
0x00007f5cf0226000, 0x00007f5cf0228800, 0x00007f5cf022a800, 0x00007f5cf022c800,
0x00007f5cf02f0000, 0x00007f5cf03fe800, 0x00007f5c90157000, 0x00007f5c9015c800,
0x00007f5c90284000, 0x00007f5c9035b000, 0x00007f5ca4001000
}

"main" #1 prio=5 os_prio=0 cpu=93.47ms elapsed=120.33s tid=0x00007f5cf0028800 nid=0xf51b in Object.wait() [0x00007f5cf67a7000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11.0.12-internal/Native Method)
- waiting on <0x0000000718cf67e0> (a java.lang.Thread)
at java.lang.Thread.join(java.base@11.0.12-internal/Thread.java:1300)
- waiting to re-lock in wait() <0x0000000718cf67e0> (a java.lang.Thread)
at java.lang.Thread.join(java.base@11.0.12-internal/Thread.java:1375)
at com.sun.javatest.regtest.agent.MainWrapper.main(MainWrapper.java:74)

"Reference Handler" #2 daemon prio=10 os_prio=0 cpu=0.19ms elapsed=120.32s tid=0x00007f5cf020b000 nid=0xf525 waiting on condition [0x00007f5ccc185000]
   java.lang.Thread.State: RUNNABLE
at java.lang.ref.Reference.waitForReferencePendingList(java.base@11.0.12-internal/Native Method)
at java.lang.ref.Reference.processPendingReferences(java.base@11.0.12-internal/Reference.java:241)
at java.lang.ref.Reference$ReferenceHandler.run(java.base@11.0.12-internal/Reference.java:213)

"Finalizer" #3 daemon prio=8 os_prio=0 cpu=0.21ms elapsed=120.31s tid=0x00007f5cf020f000 nid=0xf526 in Object.wait() [0x00007f5cc57fe000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11.0.12-internal/Native Method)
- waiting on <0x0000000718d09008> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@11.0.12-internal/ReferenceQueue.java:155)
- waiting to re-lock in wait() <0x0000000718d09008> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@11.0.12-internal/ReferenceQueue.java:176)
at java.lang.ref.Finalizer$FinalizerThread.run(java.base@11.0.12-internal/Finalizer.java:170)

"Signal Dispatcher" #4 daemon prio=9 os_prio=0 cpu=0.24ms elapsed=120.31s tid=0x00007f5cf0224000 nid=0xf527 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Service Thread" #5 daemon prio=9 os_prio=0 cpu=0.03ms elapsed=120.31s tid=0x00007f5cf0226000 nid=0xf528 runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"C2 CompilerThread0" #6 daemon prio=9 os_prio=0 cpu=150.53ms elapsed=120.31s tid=0x00007f5cf0228800 nid=0xf529 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE
   No compile task

"C1 CompilerThread0" #9 daemon prio=9 os_prio=0 cpu=113.93ms elapsed=120.31s tid=0x00007f5cf022a800 nid=0xf52a waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE
   No compile task

"Sweeper thread" #10 daemon prio=9 os_prio=0 cpu=0.03ms elapsed=120.31s tid=0x00007f5cf022c800 nid=0xf52b runnable [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"Common-Cleaner" #11 daemon prio=8 os_prio=0 cpu=0.39ms elapsed=120.28s tid=0x00007f5cf02f0000 nid=0xf52c in Object.wait() [0x00007f5cc441a000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait(java.base@11.0.12-internal/Native Method)
- waiting on <0x0000000718c05a98> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@11.0.12-internal/ReferenceQueue.java:155)
- waiting to re-lock in wait() <0x0000000718c05a98> (a java.lang.ref.ReferenceQueue$Lock)
at jdk.internal.ref.CleanerImpl.run(java.base@11.0.12-internal/CleanerImpl.java:148)
at java.lang.Thread.run(java.base@11.0.12-internal/Thread.java:829)
at jdk.internal.misc.InnocuousThread.run(java.base@11.0.12-internal/InnocuousThread.java:134)

"MainThread" #13 prio=5 os_prio=0 cpu=179.62ms elapsed=120.24s tid=0x00007f5cf03fe800 nid=0xf52e in Object.wait() [0x00007f5cc4216000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11.0.12-internal/Native Method)
- waiting on <0x000000071886d830> (a java.awt.EventQueue$1AWTInvocationLock)
at java.lang.Object.wait(java.base@11.0.12-internal/Object.java:328)
at java.awt.EventQueue.invokeAndWait(java.desktop@11.0.12-internal/EventQueue.java:1367)
- waiting to re-lock in wait() <0x000000071886d830> (a java.awt.EventQueue$1AWTInvocationLock)
at java.awt.EventQueue.invokeAndWait(java.desktop@11.0.12-internal/EventQueue.java:1348)
at sun.awt.SunToolkit.realSync(java.desktop@11.0.12-internal/SunToolkit.java:1518)
at sun.awt.SunToolkit.realSync(java.desktop@11.0.12-internal/SunToolkit.java:1464)
at java.awt.Robot.waitForIdle(java.desktop@11.0.12-internal/Robot.java:693)
- locked <0x0000000718b31108> (a java.awt.Robot)
at FlushCurrentEvent.main(FlushCurrentEvent.java:43)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@11.0.12-internal/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@11.0.12-internal/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@11.0.12-internal/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@11.0.12-internal/Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.lang.Thread.run(java.base@11.0.12-internal/Thread.java:829)

"Java2D Disposer" #15 daemon prio=10 os_prio=0 cpu=0.08ms elapsed=120.14s tid=0x00007f5c90157000 nid=0xf537 in Object.wait() [0x00007f5c895c9000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11.0.12-internal/Native Method)
- waiting on <0x000000071882d6a8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@11.0.12-internal/ReferenceQueue.java:155)
- waiting to re-lock in wait() <0x000000071882d6a8> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(java.base@11.0.12-internal/ReferenceQueue.java:176)
at sun.java2d.Disposer.run(java.desktop@11.0.12-internal/Disposer.java:144)
at java.lang.Thread.run(java.base@11.0.12-internal/Thread.java:829)

"AWT-XAWT" #16 daemon prio=6 os_prio=0 cpu=35.94ms elapsed=120.14s tid=0x00007f5c9015c800 nid=0xf538 runnable [0x00007f5c894c8000]
   java.lang.Thread.State: RUNNABLE
at sun.awt.X11.XToolkit.waitForEvents(java.desktop@11.0.12-internal/Native Method)
at sun.awt.X11.XToolkit.run(java.desktop@11.0.12-internal/XToolkit.java:693)
at sun.awt.X11.XToolkit.run(java.desktop@11.0.12-internal/XToolkit.java:657)
at java.lang.Thread.run(java.base@11.0.12-internal/Thread.java:829)

"AWT-Shutdown" #18 prio=5 os_prio=0 cpu=0.14ms elapsed=120.05s tid=0x00007f5c90284000 nid=0xf539 in Object.wait() [0x00007f5c88141000]
   java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(java.base@11.0.12-internal/Native Method)
- waiting on <0x0000000718867c98> (a java.lang.Object)
at java.lang.Object.wait(java.base@11.0.12-internal/Object.java:328)
at sun.awt.AWTAutoShutdown.run(java.desktop@11.0.12-internal/AWTAutoShutdown.java:291)
- waiting to re-lock in wait() <0x0000000718867c98> (a java.lang.Object)
at java.lang.Thread.run(java.base@11.0.12-internal/Thread.java:829)

"AWT-EventQueue-0" #17 prio=6 os_prio=0 cpu=7.75ms elapsed=120.05s tid=0x00007f5c9035b000 nid=0xf53a waiting for monitor entry [0x00007f5c73ffc000]
   java.lang.Thread.State: BLOCKED (on object monitor)
at java.awt.Robot.delay(java.desktop@11.0.12-internal/Robot.java:672)
- waiting to lock <0x0000000718b31108> (a java.awt.Robot)
at FlushCurrentEvent.lambda$main$0(FlushCurrentEvent.java:40)
at FlushCurrentEvent$$Lambda$30/0x00000008000e2840.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(java.desktop@11.0.12-internal/InvocationEvent.java:313)
at java.awt.EventQueue.dispatchEventImpl(java.desktop@11.0.12-internal/EventQueue.java:776)
at java.awt.EventQueue$4.run(java.desktop@11.0.12-internal/EventQueue.java:727)
at java.awt.EventQueue$4.run(java.desktop@11.0.12-internal/EventQueue.java:721)
at java.security.AccessController.doPrivileged(java.base@11.0.12-internal/Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(java.base@11.0.12-internal/ProtectionDomain.java:85)
at java.awt.EventQueue.dispatchEvent(java.desktop@11.0.12-internal/EventQueue.java:746)
at java.awt.EventDispatchThread.pumpOneEventForFilters(java.desktop@11.0.12-internal/EventDispatchThread.java:203)
at java.awt.EventDispatchThread.pumpEventsForFilter(java.desktop@11.0.12-internal/EventDispatchThread.java:124)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(java.desktop@11.0.12-internal/EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(java.desktop@11.0.12-internal/EventDispatchThread.java:109)
at java.awt.EventDispatchThread.pumpEvents(java.desktop@11.0.12-internal/EventDispatchThread.java:101)
at java.awt.EventDispatchThread.run(java.desktop@11.0.12-internal/EventDispatchThread.java:90)

"Attach Listener" #19 daemon prio=9 os_prio=0 cpu=0.39ms elapsed=0.10s tid=0x00007f5ca4001000 nid=0xf581 waiting on condition [0x0000000000000000]
   java.lang.Thread.State: RUNNABLE

"VM Thread" os_prio=0 cpu=7.66ms elapsed=120.32s tid=0x00007f5cf0203000 nid=0xf524 runnable

"GC Thread#0" os_prio=0 cpu=0.75ms elapsed=120.33s tid=0x00007f5cf0040800 nid=0xf51d runnable

"G1 Main Marker" os_prio=0 cpu=0.18ms elapsed=120.33s tid=0x00007f5cf009e000 nid=0xf51e runnable

"G1 Conc#0" os_prio=0 cpu=0.02ms elapsed=120.33s tid=0x00007f5cf00a0000 nid=0xf51f runnable

"G1 Refine#0" os_prio=0 cpu=0.14ms elapsed=120.33s tid=0x00007f5cf019e000 nid=0xf520 runnable

"G1 Young RemSet Sampling" os_prio=0 cpu=21.76ms elapsed=120.33s tid=0x00007f5cf019f800 nid=0xf521 runnable
"VM Periodic Task Thread" os_prio=0 cpu=107.57ms elapsed=120.26s tid=0x00007f5cf034e000 nid=0xf52d waiting on condition

JNI global refs: 70, weak refs: 0

--- Timeout information end.
elapsed time (seconds): 120.4
```


FREQUENCY : always