deadlock with log4j and powermock when running tests in parallel

[kyle999312]

Gradle build
with maxParallelForks > 1, seems like the higher the number the easier it is to reproduce
powermock 2.0.9
mockito 3.12.4

"Test worker" #14 prio=5 os_prio=0 cpu=167906.25ms elapsed=989.03s tid=0x000001757df8f800 nid=0x4450 waiting for monitor entry [0x0000004e336fa000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.ClassLoader.checkCerts(java.base@11.0.7/ClassLoader.java:1140)
- waiting to lock <0x000000070390fd00> (a org.powermock.core.classloader.javassist.JavassistMockClassLoader)
at java.lang.ClassLoader.preDefineClass(java.base@11.0.7/ClassLoader.java:906)
at java.lang.ClassLoader.defineClass(java.base@11.0.7/ClassLoader.java:1015)
at org.powermock.core.classloader.javassist.JavassistMockClassLoader.loadUnmockedClass(JavassistMockClassLoader.java:90)
at org.powermock.core.classloader.MockClassLoader.loadClassByThisClassLoader(MockClassLoader.java:104)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass1(DeferSupportingClassLoader.java:147)
at org.powermock.core.classloader.DeferSupportingClassLoader.loadClass(DeferSupportingClassLoader.java:98)
- locked <0x000000071140aa88> (a java.lang.Object)
at java.lang.ClassLoader.loadClass(java.base@11.0.7/ClassLoader.java:522)
at org.apache.logging.log4j.util.LoaderUtil.loadClass(LoaderUtil.java:144)
at org.apache.logging.log4j.util.LoaderUtil.isClassAvailable(LoaderUtil.java:118)
at org.apache.logging.log4j.core.util.Loader.isClassAvailable(Loader.java:354)
at org.apache.logging.log4j.core.config.yaml.YamlConfigurationFactory.(YamlConfigurationFactory.java:47)
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(java.base@11.0.7/Native Method)
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(java.base@11.0.7/NativeConstructorAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(java.base@11.0.7/DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(java.base@11.0.7/Constructor.java:490)
at org.apache.logging.log4j.core.util.ReflectionUtil.instantiate(ReflectionUtil.java:189)
at org.apache.logging.log4j.core.config.ConfigurationFactory.addFactory(ConfigurationFactory.java:231)
at org.apache.logging.log4j.core.config.ConfigurationFactory.getInstance(ConfigurationFactory.java:179)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:690)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:711)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:253)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:245)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:47)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:176)
at org.apache.logging.log4j.LogManager.getLogger(LogManager.java:666)
at org.apache.logging.log4j.LogManager.getRootLogger(LogManager.java:700)