diff --git a/httpcore5/src/main/java/org/apache/hc/core5/reactor/ssl/SSLIOSession.java b/httpcore5/src/main/java/org/apache/hc/core5/reactor/ssl/SSLIOSession.java
index d62dd9175..5800cb671 100644
--- a/httpcore5/src/main/java/org/apache/hc/core5/reactor/ssl/SSLIOSession.java
+++ b/httpcore5/src/main/java/org/apache/hc/core5/reactor/ssl/SSLIOSession.java
@@ -890,7 +890,10 @@ private static void formatOps(final StringBuilder buffer, final int ops) {
 
     @Override
     public String toString() {
-        this.session.getLock().lock();
+        if (!this.session.getLock().tryLock()) {
+            // show simplified version for non-locked case
+            return this.session.getId() + "[" + this.status + "]";
+        }
         try {
             final StringBuilder buffer = new StringBuilder();
             buffer.append(this.session);