ROLE timeout during sentinel connect

src/StackExchange.Redis/ConnectionMultiplexer.Sentinel.cs

@@ -242,10 +242,17 @@ public ConnectionMultiplexer GetSentinelMasterConnection(ConfigurationOptions co
 
             // verify role is primary according to:
             // https://redis.io/topics/sentinel-clients
-            if (connection.GetServer(newPrimaryEndPoint)?.Role()?.Value == RedisLiterals.master)
+            try
+            {
+                if (connection.GetServer(newPrimaryEndPoint)?.Role()?.Value == RedisLiterals.master)
+                {
+                    success = true;
+                    break;
+                }
+            }
+            catch (RedisTimeoutException)
             {
-                success = true;
-                break;
+                // syncTimeout, could be transient
             }
 
             Thread.Sleep(100);

src/StackExchange.Redis/Message.cs

@@ -438,6 +438,8 @@ bool ICompletable.TryComplete(bool isAsync)
             return true;
         }
 
+        private Random _rand = new();
+
         public void Complete()
         {
             // Ensure we can never call Complete on the same resultBox from two threads by grabbing it now
@@ -446,6 +448,10 @@ public void Complete()
             // set the completion/performance data
             performance?.SetCompleted();
 
+            if (_rand.Next(0, 2) == 0 && Command == RedisCommand.ROLE)
+            {
+                Thread.Sleep(15);
+            }
             currBox?.ActivateContinuations();
         }
 

tests/StackExchange.Redis.Tests/Issues/IssueXXXTests.cs

@@ -0,0 +1,22 @@
+using System.Diagnostics;
+using System.Threading;
+using System.Threading.Tasks;
+using Xunit;
+using Xunit.Sdk;
+
+namespace StackExchange.Redis.Tests.Issues;
+
+public class IssueXXXTests(ITestOutputHelper output)
+{
+    private readonly ITestOutputHelper _output = output;
+
+    [Fact]
+    public void Execute()
+    {
+        Parallel.For(0, 10, _ =>
+        {
+            using var conn = ConnectionMultiplexer.Connect(
+                $"abortConnect=false,syncTimeout=5,{TestConfig.Current.SentinelServer},serviceName={TestConfig.Current.SentinelSeviceName}");
+        });
+    }
+}