I have found no way of dumping the stack on all threads in .NET. Neither a signal to be send to the process nor programatic access to all the threads. I can only get access to the current thread via Thread.CurrentThread.
Any tricks?
If you're trying to get a stack dump while the process is already running (a la jstack), there are two methods as described here :
There is a little-known but effective tool called the Managed Stack Explorer . Although it features a basic GUI, it can effectively be a .NET equivalent of jstack if you add to the path; then it's just a question of typing:
mse /s /p <pid>
I just found it necessary to take a production thread dump and this worked for me. Hope it helps :-)
Just to save anyone else the bother here's the port of the above to c#:
static void WriteThreadInfo(StringBuilder sw, IEnumerable<Thread> threads)
{
foreach(Thread thread in threads)
{
if(!thread.IsAlive) continue;
sw.Append(String.Concat("THREAD NAME: ", thread.Name));
sw.Append(GetStackTrace(thread));
sw.AppendLine();
sw.AppendLine();
}
}
static String GetStackTrace(Thread t)
{
t.Suspend();
var trace1 = new StackTrace(t, true);
t.Resume();
String text1 = System.Environment.NewLine;
var builder1 = new StringBuilder(255);
for (Int32 num1 = 0; (num1 < trace1.FrameCount); num1++)
{
StackFrame frame1 = trace1.GetFrame(num1);
builder1.Append(" at ");
System.Reflection.MethodBase base1 = frame1.GetMethod();
Type type1 = base1.DeclaringType;
if (type1 != null)
{
String text2 = type1.Namespace;
if (text2 != null)
{
builder1.Append(text2);
builder1.Append(".");
}
builder1.Append(type1.Name);
builder1.Append(".");
}
builder1.Append(base1.Name);
builder1.Append("(");
System.Reflection.ParameterInfo [] infoArray1 = base1.GetParameters();
for (Int32 num2 = 0; (num2 < infoArray1.Length); num2++)
{
String text3 = "<UnknownType>";
if (infoArray1[num2].ParameterType != null)
{
text3 = infoArray1[num2].ParameterType.Name;
}
builder1.Append(String.Concat(((num2 != 0) ? ", " : ""), text3, " ", infoArray1[num2].Name));
}
builder1.Append(")");
if (frame1.GetILOffset() != -1)
{
String text4 = null;
try
{
text4 = frame1.GetFileName();
}
catch (System.Security.SecurityException)
{
}
if (text4 != null)
{
builder1.Append(String.Concat(" in ", text4, ":line ", frame1.GetFileLineNumber().ToString()));
}
}
if (num1 != (trace1.FrameCount - 1))
{
builder1.Append(text1);
}
}
return builder1.ToString();
}
I've not found a way to get a list of all managed threads in C# (only ProcessThreads), so it does look like you need to maintain the list of threads your interested in yourself.
Also I found I couldn't call new Stacktrace(t,true) on a running thread, so have added pause and resumes. Obviously you'll need to consider whether this could cause problems were you to thread dump your production app .
btw, we've put this call on our apps wcf rest interface so it's easy to do.
The best tool I have seen at this point to generate thread dumps for the .NET CLR is DebugDiag. This tool will generate a very detailed report (using the Crash/Hang analyzer) of the active CLR threads along with recommendations.
I recommend to review the following .NET DebugDiag tutorial as it is showing the analysis process in action following a production problem. The steps are as per below:
I wrote a dumper for a project i worked on in the past:
void CrashHandler::WriteThreadInfo(StringWriter* sw, ArrayList* threads, String* type)
{
sw->WriteLine(type);
IEnumerator* ie = threads->GetEnumerator();
while(ie->MoveNext())
{
botNETThread* bnt = static_cast<botNETThread*>(ie->Current);
if(!bnt->IsAlive) continue;
sw->WriteLine(String::Concat(S"ORIGIN ASSEMBLY: ", bnt->Assembly->FullName));
sw->WriteLine(String::Concat(S"THREAD NAME: ", (bnt->Name && bnt->Name->Length)?bnt->Name:S"Unnamed thread"));
sw->Write(GetStackTrace(bnt->_thread));
sw->WriteLine();
sw->WriteLine();
}
}
String* CrashHandler::GetStackTrace(Thread* t)
{
System::Diagnostics::StackTrace __gc * trace1 = __gc new System::Diagnostics::StackTrace(t, true);
System::String __gc * text1 = System::Environment::NewLine;
System::Text::StringBuilder __gc * builder1 = __gc new System::Text::StringBuilder(255);
for (System::Int32 num1 = 0; (num1 < trace1->FrameCount); num1++)
{
System::Diagnostics::StackFrame __gc * frame1 = trace1->GetFrame(num1);
builder1->Append(S" at ");
System::Reflection::MethodBase __gc * base1 = frame1->GetMethod();
System::Type __gc * type1 = base1->DeclaringType;
if (type1 != 0)
{
System::String __gc * text2 = type1->Namespace;
if (text2 != 0)
{
builder1->Append(text2);
if (builder1 != 0)
{
builder1->Append(S".");
}
}
builder1->Append(type1->Name);
builder1->Append(S".");
}
builder1->Append(base1->Name);
builder1->Append(S"(");
System::Reflection::ParameterInfo __gc * infoArray1 __gc [] = base1->GetParameters();
for (System::Int32 num2 = 0; (num2 < infoArray1->Length); num2++)
{
System::String __gc * text3 = S"<UnknownType>";
if (infoArray1[num2]->ParameterType != 0)
{
text3 = infoArray1[num2]->ParameterType->Name;
}
builder1->Append(System::String::Concat(((num2 != 0) ? S", " : S""), text3, S" ", infoArray1[num2]->Name));
}
builder1->Append(S")");
if (frame1->GetILOffset() != -1)
{
System::String __gc * text4 = 0;
try
{
text4 = frame1->GetFileName();
}
catch (System::Security::SecurityException*)
{
}
if (text4 != 0)
{
builder1->Append(System::String::Concat(S" in ", text4, S":line ", frame1->GetFileLineNumber().ToString()));
}
}
if (num1 != (trace1->FrameCount - 1))
{
builder1->Append(text1);
}
}
return builder1->ToString();
}
You can use Process.GetCurrentProcess().Threads to get threads
And I know i spasted Managed C++ but its easy enough to follow. I take an arraylist of threads because for my purpose I had catagorized my threads. And yes i used previously written stack frame code as I was new to MC++ at the time :)
The entire file is here . This was for a Diablo II botting engine I wrote some time ago.
If you need to do this programmatically (maybe you want automatic dumps during your CI process), you can use the info from this answer to a different question.
Basically, attach to your own process using CLR MD :
using Microsoft.Diagnostics.Runtime;
using (DataTarget target = DataTarget.AttachToProcess(
Process.GetCurrentProcess().Id, 5000, AttachFlag.Passive))
{
ClrRuntime runtime = target.ClrVersions.First().CreateRuntime();
foreach (ClrThread thread in runtime.Threads)
{
IList<ClrStackFrame> stackFrames = thread.StackTrace;
PrintStackTrace(stackFrames);
}
}
Here PrintStackTrace is left as an exercise for the reader.
There is a variety of handy classes in the System.Diagnostics that can help you with debugging and gathering various tracking information, ie StackTrace.
There is a wonky Process class that can be used to get the number of executing threads but very few details. Use the following Snippet:
Using System.Diagnostics;
var threads = Process.GetCurrentProcess().Threads;
Okay after looking a little bit more it appears the easiest way to capture all the current stacks is through a mini dump and a tool like SOS or if you are running vista this .
Good luck.
I am using https://github.com/odinserj/stdump , a tool for explore stack trace of a running managed process.
To display a stack trace of a running program, use its PID or process name.
stdump 12832
stdump w3wp.exe
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