Add specific test

profiler/src/Demos/Samples.Computer01/ComputerService.cs

@@ -44,6 +44,7 @@ public class ComputerService
         private NullThreadNameBugCheck _nullThreadNameBugCheck;
         private MethodsSignature _methodsSignature;
         private SigSegvHandlerExecution _sigsegvHandler;
+        private LinuxDlIteratePhdrDeadlock _linuxDlIteratePhdrDeadlock;
 
 #if NET5_0_OR_GREATER
         private OpenLdapCrash _openldapCrash;
@@ -181,6 +182,10 @@ public void StartService(Scenario scenario, int nbThreads, int parameter)
                     StartStringConcat(parameter);
                     break;
 
+                case Scenario.LinuxDlIteratePhdrDeadlock:
+                    StartLinuxDlIteratePhdrDeadlock();
+                    break;
+
                 default:
                     throw new ArgumentOutOfRangeException(nameof(scenario), $"Unsupported scenario #{_scenario}");
             }
@@ -311,6 +316,10 @@ public void StopService()
                 case Scenario.StringConcat:
                     StopStringConcat();
                     break;
+
+                case Scenario.LinuxDlIteratePhdrDeadlock:
+                    StopLinuxDlIteratePhdrDeadlock();
+                    break;
             }
         }
 
@@ -575,6 +584,12 @@ private void StartLinuxMallocDeadlock()
             _linuxMallockDeadlock.Start();
         }
 
+        private void StartLinuxDlIteratePhdrDeadlock()
+        {
+            _linuxDlIteratePhdrDeadlock = new LinuxDlIteratePhdrDeadlock();
+            _linuxDlIteratePhdrDeadlock.Start();
+        }
+
         private void StartMeasureAllocations()
         {
             _measureAllocations = new MeasureAllocations();
@@ -749,6 +764,11 @@ private void StopLinuxMallocDeadlock()
             _linuxMallockDeadlock.Stop();
         }
 
+        private void StopLinuxDlIteratePhdrDeadlock()
+        {
+            _linuxDlIteratePhdrDeadlock.Stop();
+        }
+
         private void StopMeasureAllocations()
         {
             _measureAllocations.Stop();

profiler/src/Demos/Samples.Computer01/LinuxDlIteratePhdrDeadlock.cs

@@ -0,0 +1,124 @@
+// <copyright file="LinuxDlIteratePhdrDeadlock.cs" company="Datadog">
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2 License.
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2022 Datadog, Inc.
+// </copyright>
+
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Samples.Computer01
+{
+    internal class LinuxDlIteratePhdrDeadlock
+    {
+        private ManualResetEvent _stopEvent;
+        private Task _exceptionTask;
+        private Thread _worker;
+
+        public void Start()
+        {
+            if (_stopEvent != null)
+            {
+                throw new InvalidOperationException("Already running...");
+            }
+
+            _stopEvent = new ManualResetEvent(false);
+
+            _worker = new Thread(ExecuteCallToDlOpenDlClose)
+            {
+                IsBackground = false // set to false to prevent the app from shutting down. The test will fail
+            };
+            _worker.Start();
+
+            _exceptionTask = Task.Factory.StartNew(
+                        () =>
+                        {
+                            var nbException = 0;
+                            var loggingClock = Stopwatch.StartNew();
+                            while (!IsEventSet())
+                            {
+                                if (loggingClock.ElapsedMilliseconds >= 1000)
+                                {
+                                    Console.WriteLine($"* Nb thrown exception {nbException}");
+                                    Thread.Sleep(TimeSpan.FromMilliseconds(500));
+                                    nbException = 0;
+                                    loggingClock.Restart();
+                                }
+
+                                for (var i = 0; i < 20; i++)
+                                {
+                                    try
+                                    {
+                                        throw new Exception("dl_iterate_phdr deadlock exception");
+                                    }
+                                    catch { }
+                                    nbException++;
+                                }
+
+                                // wait a bit randomly (23 is a prime number chosen randomly)
+                                Thread.Sleep(TimeSpan.FromMilliseconds(23));
+                            }
+                        },
+                        TaskCreationOptions.LongRunning);
+        }
+
+        public void Run()
+        {
+            Start();
+            Thread.Sleep(TimeSpan.FromSeconds(10));
+            Stop();
+        }
+
+        public void Stop()
+        {
+            if (_stopEvent == null)
+            {
+                throw new InvalidOperationException("Not running...");
+            }
+
+            _stopEvent.Set();
+
+            _worker.Join();
+            _exceptionTask.Wait();
+
+            _stopEvent.Dispose();
+            _stopEvent = null;
+        }
+
+        [DllImport("libdl.so", EntryPoint = "dlopen")]
+        private static extern IntPtr Dlopen(string filename, int flags);
+
+        [DllImport("libdl.so", EntryPoint = "dlclose")]
+        private static extern void DlClose(IntPtr handle);
+
+        private void ExecuteCallToDlOpenDlClose()
+        {
+            var loggingClock = Stopwatch.StartNew();
+            var counter = 0;
+
+            while (!IsEventSet())
+            {
+                if (loggingClock.ElapsedMilliseconds >= 1000)
+                {
+                    Console.WriteLine($"* Nb execution {counter}");
+                    Thread.Sleep(TimeSpan.FromMilliseconds(500));
+                    counter = 0;
+                    loggingClock.Restart();
+                }
+
+                var handle = Dlopen("libc.so.6", 2);
+                Thread.Sleep(TimeSpan.FromMilliseconds(10));
+                DlClose(handle);
+
+                counter++;
+            }
+        }
+
+        private bool IsEventSet()
+        {
+            return _stopEvent.WaitOne(0);
+        }
+    }
+}

profiler/src/Demos/Samples.Computer01/Program.cs

@@ -40,6 +40,7 @@ public enum Scenario
         Obfuscation,
         ThreadSpikes,
         StringConcat, // parameter = number of strings to concatenate
+        LinuxDlIteratePhdrDeadlock,
     }
 
     public class Program
@@ -76,6 +77,7 @@ public static void Main(string[] args)
             // 24: use an obfuscated library
             // 25: create thread spikes
             // 26: string concatenation
+            // 27: custom dl_iterate_phdr deadlock
             //
             Console.WriteLine($"{Environment.NewLine}Usage:{Environment.NewLine} > {Process.GetCurrentProcess().ProcessName} " +
             $"[--service] [--iterations <number of iterations to execute>] " +

profiler/test/Datadog.Profiler.IntegrationTests/LinuxOnly/DlIteratePhdrDeadlock.cs

@@ -0,0 +1,31 @@
+// <copyright file="DlIteratePhdrDeadlock.cs" company="Datadog">
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2 License.
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2022 Datadog, Inc.
+// </copyright>
+
+using Datadog.Profiler.IntegrationTests.Helpers;
+using Datadog.Profiler.SmokeTests;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Datadog.Profiler.IntegrationTests.LinuxOnly
+{
+    [Trait("Category", "LinuxOnly")]
+    public class DlIteratePhdrDeadlock
+    {
+        private const string ScenarioLinuxDliteratePhdrDeadlock = "--scenario 27";
+        private readonly ITestOutputHelper _output;
+
+        public DlIteratePhdrDeadlock(ITestOutputHelper output)
+        {
+            _output = output;
+        }
+
+        [TestAppFact("Samples.Computer01")]
+        public void CheckApplicationDoesNotEndUpInDeadlock(string appName, string framework, string appAssembly)
+        {
+            var runner = new SmokeTestRunner(appName, framework, appAssembly, ScenarioLinuxDliteratePhdrDeadlock, _output);
+            runner.RunAndCheck();
+        }
+    }
+}