Index: log4j-api/src/main/java/org/apache/logging/log4j/util/ProviderUtil.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- log4j-api/src/main/java/org/apache/logging/log4j/util/ProviderUtil.java	(revision e4bca837b5d99c982e9126e869665e9c83cad1dd)
+++ log4j-api/src/main/java/org/apache/logging/log4j/util/ProviderUtil.java	(revision )
@@ -117,14 +117,16 @@
         if (INSTANCE == null) {
             try {
                 STARTUP_LOCK.lockInterruptibly();
+                try {
-                if (INSTANCE == null) {
-                    INSTANCE = new ProviderUtil();
-                }
+                    if (INSTANCE == null) {
+                        INSTANCE = new ProviderUtil();
+                    }
+                } finally {
+                    STARTUP_LOCK.unlock();
+                }
             } catch (final InterruptedException e) {
                 LOGGER.fatal("Interrupted before Log4j Providers could be loaded.", e);
                 Thread.currentThread().interrupt();
-            } finally {
-                STARTUP_LOCK.unlock();
             }
         }
     }