diff --git a/infer/models/java/src/java/util/concurrent/ReentrantLock.java b/infer/models/java/src/java/util/concurrent/ReentrantLock.java
index 3b3fb07b7..f2e2a8412 100644
--- a/infer/models/java/src/java/util/concurrent/ReentrantLock.java
+++ b/infer/models/java/src/java/util/concurrent/ReentrantLock.java
@@ -19,6 +19,7 @@
 */
 
 package java.util.concurrent.locks;
+import java.util.concurrent.TimeUnit;
 import com.facebook.infer.builtins.InferBuiltins;
 import com.facebook.infer.builtins.InferUndefined;
 
@@ -32,6 +33,41 @@ public abstract class ReentrantLock extends Lock implements java.io.Serializable
       InferBuiltins.__set_locked_attribute(this);
     }
 
+    /**
+      Sometimes doesn't get a lock.
+     */
+    public void lockInterruptibly() throws InterruptedException {
+      if (InferUndefined.boolean_undefined()) {
+          InferBuiltins.__set_locked_attribute(this);
+        } else {
+            throw new InterruptedException();
+        }
+    }
+
+    /**
+      Again, doesn't always succeed
+     */
+    public boolean tryLock() {
+      if (InferUndefined.boolean_undefined()) {
+          InferBuiltins.__set_locked_attribute(this);
+          return true;
+        } else {
+          return false;
+        }
+    }
+
+    public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException {
+      if (InferUndefined.boolean_undefined()) {throw new InterruptedException();}
+
+      if (InferUndefined.boolean_undefined()) {
+          InferBuiltins.__set_locked_attribute(this);
+          return true;
+        } else {
+          return false;
+        }
+    }
+
+
      /**
      * In some implementations (like ReentrantLock) an exception is thrown if the lock
      * is not held by the current thread. This model does not consider that possibility.
diff --git a/infer/tests/build_systems/ant/issues.exp b/infer/tests/build_systems/ant/issues.exp
index e49d1dd79..5da9ddabc 100644
--- a/infer/tests/build_systems/ant/issues.exp
+++ b/infer/tests/build_systems/ant/issues.exp
@@ -50,6 +50,8 @@ src/infer/GuardedByExample.java, Object GuardedByExample.byRefTrickyBad(), 5, UN
 src/infer/GuardedByExample.java, String GuardedByExample$3.readFromInnerClassBad1(), 2, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFromInnerClassBad1()]
 src/infer/GuardedByExample.java, String GuardedByExample$4.readFromInnerClassBad2(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFromInnerClassBad2()]
 src/infer/GuardedByExample.java, void GuardedByExample$Sub.badSub(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badSub()]
+src/infer/GuardedByExample.java, void GuardedByExample.badGuardedByNormalLock(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badGuardedByNormalLock()]
+src/infer/GuardedByExample.java, void GuardedByExample.badGuardedByReentrantLock(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badGuardedByReentrantLock()]
 src/infer/GuardedByExample.java, void GuardedByExample.readFAfterBlockBad(), 3, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFAfterBlockBad()]
 src/infer/GuardedByExample.java, void GuardedByExample.readFBad(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFBad()]
 src/infer/GuardedByExample.java, void GuardedByExample.readFBadButSuppressedOther(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFBadButSuppressedOther()]
diff --git a/infer/tests/build_systems/buck/issues.exp b/infer/tests/build_systems/buck/issues.exp
index 4ecc4a43f..33de7b5aa 100644
--- a/infer/tests/build_systems/buck/issues.exp
+++ b/infer/tests/build_systems/buck/issues.exp
@@ -50,6 +50,8 @@ infer/tests/codetoanalyze/java/infer/GuardedByExample.java, Object GuardedByExam
 infer/tests/codetoanalyze/java/infer/GuardedByExample.java, String GuardedByExample$3.readFromInnerClassBad1(), 2, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFromInnerClassBad1()]
 infer/tests/codetoanalyze/java/infer/GuardedByExample.java, String GuardedByExample$4.readFromInnerClassBad2(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFromInnerClassBad2()]
 infer/tests/codetoanalyze/java/infer/GuardedByExample.java, void GuardedByExample$Sub.badSub(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badSub()]
+infer/tests/codetoanalyze/java/infer/GuardedByExample.java, void GuardedByExample.badGuardedByNormalLock(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badGuardedByNormalLock()]
+infer/tests/codetoanalyze/java/infer/GuardedByExample.java, void GuardedByExample.badGuardedByReentrantLock(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badGuardedByReentrantLock()]
 infer/tests/codetoanalyze/java/infer/GuardedByExample.java, void GuardedByExample.readFAfterBlockBad(), 3, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFAfterBlockBad()]
 infer/tests/codetoanalyze/java/infer/GuardedByExample.java, void GuardedByExample.readFBad(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFBad()]
 infer/tests/codetoanalyze/java/infer/GuardedByExample.java, void GuardedByExample.readFBadButSuppressedOther(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFBadButSuppressedOther()]
diff --git a/infer/tests/codetoanalyze/java/infer/GuardedByExample.java b/infer/tests/codetoanalyze/java/infer/GuardedByExample.java
index 39a07f7b1..da3d76582 100644
--- a/infer/tests/codetoanalyze/java/infer/GuardedByExample.java
+++ b/infer/tests/codetoanalyze/java/infer/GuardedByExample.java
@@ -16,6 +16,8 @@ import java.lang.annotation.Target;
 import com.google.common.annotations.VisibleForTesting;
 import android.annotation.SuppressLint;
 import javax.annotation.concurrent.GuardedBy;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
@@ -494,4 +496,43 @@ public class GuardedByExample {
 
   }
 
+  Lock normallock;
+
+  @GuardedBy("normallock")
+  Integer guardedbynl;
+
+  ReentrantLock reentrantlock;
+
+  @GuardedBy("reentrantlock")
+  Integer guardedbyrel;
+
+
+  void goodGuardedByNormalLock() {
+    normallock.lock();
+    guardedbynl = 22;
+    normallock.unlock();
+  }
+
+  void goodTryLockGuardedByNormalLock() {
+    if (normallock.tryLock()) {
+      guardedbynl = 22;
+      normallock.unlock();
+    }
+  }
+
+  void goodTryLockGuardedByReentrantLock() {
+    if (reentrantlock.tryLock()) {
+      guardedbyrel = 44;
+      reentrantlock.unlock();
+    }
+  }
+
+  void badGuardedByNormalLock(){
+    guardedbynl = 22;
+  }
+
+  void badGuardedByReentrantLock(){
+    guardedbyrel = 44;
+  }
+
 }
diff --git a/infer/tests/codetoanalyze/java/infer/issues.exp b/infer/tests/codetoanalyze/java/infer/issues.exp
index 6bb9dc532..b4c6c84fe 100644
--- a/infer/tests/codetoanalyze/java/infer/issues.exp
+++ b/infer/tests/codetoanalyze/java/infer/issues.exp
@@ -129,6 +129,8 @@ GuardedByExample.java, Object GuardedByExample.byRefTrickyBad(), 5, UNSAFE_GUARD
 GuardedByExample.java, String GuardedByExample$3.readFromInnerClassBad1(), 2, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFromInnerClassBad1()]
 GuardedByExample.java, String GuardedByExample$4.readFromInnerClassBad2(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFromInnerClassBad2()]
 GuardedByExample.java, void GuardedByExample$Sub.badSub(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badSub()]
+GuardedByExample.java, void GuardedByExample.badGuardedByNormalLock(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badGuardedByNormalLock()]
+GuardedByExample.java, void GuardedByExample.badGuardedByReentrantLock(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure badGuardedByReentrantLock()]
 GuardedByExample.java, void GuardedByExample.readFAfterBlockBad(), 3, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFAfterBlockBad()]
 GuardedByExample.java, void GuardedByExample.readFBad(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFBad()]
 GuardedByExample.java, void GuardedByExample.readFBadButSuppressedOther(), 1, UNSAFE_GUARDED_BY_ACCESS, [start of procedure readFBadButSuppressedOther()]