Dump virtual threads with ThreadDumper when interruption took too long.

PiperOrigin-RevId: 792107510
Change-Id: I0af3c73873b4313f92e26b064a455a2b2aadaa37

Author: coeuvre

src/main/java/com/google/devtools/build/lib/util/BUILD

@@ -254,6 +254,7 @@ java_library(
         ":os",
         ":shell_escaper",
         ":string_encoding",
+        ":thread_dumper",
         "//src/main/java/com/google/devtools/build/lib/bugreport",
         "//src/main/java/com/google/devtools/build/lib/concurrent:thread_safety",
         "//src/main/java/com/google/devtools/build/lib/util/io",

src/main/java/com/google/devtools/build/lib/util/ThreadUtils.java

@@ -13,12 +13,15 @@
 // limitations under the License.
 package com.google.devtools.build.lib.util;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static java.util.stream.Collectors.toCollection;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Joiner;
 import com.google.common.flogger.GoogleLogger;
 import com.google.devtools.build.lib.bugreport.BugReporter;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;
@@ -46,8 +49,7 @@ public class ThreadUtils {
       MAP_WITH_ARRAY_LIST_VALUES_COLLECTOR =
           Collectors.groupingBy(StackTraceAndState::new, toCollection(ArrayList::new));
 
-  private ThreadUtils() {
-  }
+  private ThreadUtils() {}
 
   /** Write a thread dump to the blaze.INFO log if interrupt took too long. */
   public static synchronized void warnAboutSlowInterrupt(
@@ -87,6 +89,16 @@ static synchronized void warnAboutSlowInterrupt(
                   makeString(stackTraceAndState.trace));
             });
 
+    try {
+      var out = new ByteArrayOutputStream();
+      ThreadDumper.dumpThreads(out);
+      logger.atWarning().log(
+          "Dumping additional thread state using ThreadDumper:\n%s",
+          new String(out.toByteArray(), UTF_8));
+    } catch (IOException e) {
+      logger.atWarning().withCause(e).log("Failed to dump threads with ThreadDumper.");
+    }
+
     SlowInterruptInnerException inner =
         new SlowInterruptInnerException(
             Joiner.on(' ')