This failure is seen when running with -Xcomp:

org.graalvm.compiler.core.test.UnschedulableGraphTest#test01
java.lang.AssertionError: java.lang.AssertionError: expected:<4> but was:<3>
        at org.graalvm.compiler.core.test.UnschedulableGraphTest.test01(UnschedulableGraphTest.java:114)
[...]
Caused by: java.lang.AssertionError: expected:<4> but was:<3>
        at org.junit.Assert.fail(Assert.java:88)
        at org.junit.Assert.failNotEquals(Assert.java:834)
        at org.junit.Assert.assertEquals(Assert.java:645)
        at org.junit.Assert.assertEquals(Assert.java:631)
        at org.graalvm.compiler.core.test.UnschedulableGraphTest.checkLowTierGraph(UnschedulableGraphTest.java:75)

This test is part of compiler/graalunit/Core02Test.java.