diff -uNr redis-6.0.9/src/bio.c redis-6.0.9.mod/src/bio.c
--- redis-6.0.9/src/bio.c	2020-10-27 07:12:01.000000000 +0000
+++ redis-6.0.9.mod/src/bio.c	2020-11-22 17:02:03.692060558 +0000
@@ -266,15 +266,7 @@
 
     for (j = 0; j < BIO_NUM_OPS; j++) {
         if (bio_threads[j] == pthread_self()) continue;
-        if (bio_threads[j] && pthread_cancel(bio_threads[j]) == 0) {
-            if ((err = pthread_join(bio_threads[j],NULL)) != 0) {
-                serverLog(LL_WARNING,
-                    "Bio thread for job type #%d can not be joined: %s",
-                        j, strerror(err));
-            } else {
-                serverLog(LL_WARNING,
-                    "Bio thread for job type #%d terminated",j);
-            }
-        }
+        pthread_kill(bio_threads[j], 0);
+        serverLog(LL_WARNING, "Bio thread for job type #%d terminated",j);
     }
 }