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remm pushed a commit to branch 10.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git


The following commit(s) were added to refs/heads/10.0.x by this push:
     new e910d44ce5 Fix deadlock on startup
e910d44ce5 is described below

commit e910d44ce5b2483a8c8aa181833a17624d049aad
Author: remm <r...@apache.org>
AuthorDate: Thu May 19 10:25:50 2022 +0200

    Fix deadlock on startup
    
    PR515. Involving only certain utility executor configurations. This
    should use its own lock object as the main object is already synced
    during the whole startup.
    Submitted by Han Li.
---
 java/org/apache/catalina/core/StandardServer.java | 29 +++++++++++++----------
 webapps/docs/changelog.xml                        |  4 ++++
 2 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/java/org/apache/catalina/core/StandardServer.java 
b/java/org/apache/catalina/core/StandardServer.java
index d0ead54c4a..9c8069124d 100644
--- a/java/org/apache/catalina/core/StandardServer.java
+++ b/java/org/apache/catalina/core/StandardServer.java
@@ -191,6 +191,7 @@ public final class StandardServer extends 
LifecycleMBeanBase implements Server {
      * Utility executor with scheduling capabilities.
      */
     private ScheduledThreadPoolExecutor utilityExecutor = null;
+    private final Object utilityExecutorLock = new Object();
 
     /**
      * Utility executor wrapper.
@@ -435,19 +436,21 @@ public final class StandardServer extends 
LifecycleMBeanBase implements Server {
     }
 
 
-    private synchronized void reconfigureUtilityExecutor(int threads) {
-        // The ScheduledThreadPoolExecutor doesn't use MaximumPoolSize, only 
CorePoolSize is available
-        if (utilityExecutor != null) {
-            utilityExecutor.setCorePoolSize(threads);
-        } else {
-            ScheduledThreadPoolExecutor scheduledThreadPoolExecutor =
-                    new ScheduledThreadPoolExecutor(threads,
-                            new TaskThreadFactory("Catalina-utility-", 
utilityThreadsAsDaemon, Thread.MIN_PRIORITY));
-            scheduledThreadPoolExecutor.setKeepAliveTime(10, TimeUnit.SECONDS);
-            scheduledThreadPoolExecutor.setRemoveOnCancelPolicy(true);
-            
scheduledThreadPoolExecutor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
-            utilityExecutor = scheduledThreadPoolExecutor;
-            utilityExecutorWrapper = new 
org.apache.tomcat.util.threads.ScheduledThreadPoolExecutor(utilityExecutor);
+    private void reconfigureUtilityExecutor(int threads) {
+        synchronized (utilityExecutorLock) {
+            // The ScheduledThreadPoolExecutor doesn't use MaximumPoolSize, 
only CorePoolSize is available
+            if (utilityExecutor != null) {
+                utilityExecutor.setCorePoolSize(threads);
+            } else {
+                ScheduledThreadPoolExecutor scheduledThreadPoolExecutor =
+                        new ScheduledThreadPoolExecutor(threads,
+                                new TaskThreadFactory("Catalina-utility-", 
utilityThreadsAsDaemon, Thread.MIN_PRIORITY));
+                scheduledThreadPoolExecutor.setKeepAliveTime(10, 
TimeUnit.SECONDS);
+                scheduledThreadPoolExecutor.setRemoveOnCancelPolicy(true);
+                
scheduledThreadPoolExecutor.setExecuteExistingDelayedTasksAfterShutdownPolicy(false);
+                utilityExecutor = scheduledThreadPoolExecutor;
+                utilityExecutorWrapper = new 
org.apache.tomcat.util.threads.ScheduledThreadPoolExecutor(utilityExecutor);
+            }
         }
     }
 
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 7996901586..89df868106 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -120,6 +120,10 @@
         <code>clearReferencesObjectStreamClassCaches</code> when running on a
         JRE that includes a fix for the underlying memory leak. (markt)
       </fix>
+      <fix>
+        <pr>515</pr>: Avoid deadlock on startup with some utility executor
+        configurations. Submitted by Han Li. (remm)
+      </fix>
     </changelog>
   </subsection>
   <subsection name="Jasper">


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