The new test test/jdk/javax/swing/JTabbedPane/TestBackgroundScrollPolicy.java fails in our nightly test on Ubuntu Linux :-

The test was just pushed and failed first time it was ran, so probably will fail again.

----------System.out:(8/608)----------
expected java.awt.Color[r=0,g=0,b=255] actual java.awt.Color[r=0,g=0,b=255]
expected java.awt.Color[r=255,g=0,b=0] actual java.awt.Color[r=255,g=0,b=0]
expected java.awt.Color[r=0,g=0,b=255] actual java.awt.Color[r=0,g=0,b=255]
expected java.awt.Color[r=255,g=0,b=0] actual java.awt.Color[r=0,g=0,b=255]
expected java.awt.Color[r=0,g=0,b=255] actual java.awt.Color[r=0,g=0,b=255]
expected java.awt.Color[r=255,g=0,b=0] actual java.awt.Color[r=255,g=0,b=0]
expected java.awt.Color[r=0,g=0,b=255] actual java.awt.Color[r=0,g=0,b=255]
expected java.awt.Color[r=255,g=0,b=0] actual java.awt.Color[r=0,g=0,b=255]
----------System.err:(17/1104)----------
L&F: GTK+
L&F: CDE/Motif
L&F: Nimbus
L&F: Metal
java.lang.RuntimeException: [CDE/Motif background color wrong for opaque=true, Metal background color wrong for opaque=true]
at TestBackgroundScrollPolicy.main(TestBackgroundScrollPolicy.java:52)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.RuntimeException: [CDE/Motif background color wrong for opaque=true, Metal background color wrong for opaque=true]
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: [CDE/Motif background color wrong for opaque=true, Metal background color wrong for opaque=true]

See

Changeset: 94b1c5e6a889
Author: psadhukhan
Date: 2020-05-06 14:02 +0530
URL: https://hg.openjdk.java.net/jdk/client/rev/94b1c5e6a889

8172269: When checking the default behaviour for a scroll tab layout and checking the 'opaque' checkbox, the area behind tabs is not red
Reviewed-by: serb

! src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTabbedPaneUI.java
+ test/jdk/javax/swing/JTabbedPane/TestBackgroundScrollPolicy.java