https://bugs.openjdk.org/browse/JDK-6672644 was fixed just a couple of days ago and since then several tests are regularly failing.
These tests are all failing in CI due to OOME or some expected GC not taking place. These tests often reduce the max heap.

I tried locally one of the tests javax/swing/JFileChooser/6520101/bug6520101.java - which is failing every time (I think) on all platforms

It fails due to OOME on the 72nd iteration on my x64 mac.

If I back out the fix for 6672644 all 500 iterations pass.

The failing tests are listed below
hese 3 fail due to OOME
javax/swing/UI/UnninstallUIMemoryLeaks/UnninstallUIMemoryLeaks.java - all platforms
javax/swing/JFileChooser/6520101/bug6520101.java - all platforms
javax/swing/JFileChooser/4966171/bug4966171.java - macos arm

these 2 look like they failed because GC did not collect something
java/awt/Frame/FramesGC/FramesGC.java -linux -
java/awt/Frame/DisposeParentGC/DisposeParentGC.java - linux

I do not think we should problem list 5 tests, instead we should back out the fix for JDK-6672644 ASAP and revisit it. Somewhere I think it is "leaking" and a revert will be faster to do than figure out the problem.