Anonymous pipes, streamReader.ReadLine() crashes process

I'm trying to pass information between non-unity servermanager and unity server using anonymous pipes, which seems like an easy solution at the first place, but im getting a crash when testing it. I'm passing in handle as commandline argument from a parent process(servermanager) and it gets the sync message correctly, but when trying to read additional lines after that the process just freezes with a white screen nothing appearing at all. Since it is a standalone process, i have no idea how to debug it. output_log.txt only shows information about the build.

Part of the code that crashes is here

Code (CSharp):

1. void Start ()
2.     {
3.         GetHandles();
4.         StartCoroutine(IncomingStream());
5.     }
6.  
7. IEnumerator IncomingStream()
8.     {
9.         string temp;
10.         if (!synced)
11.         {
12.             pipeInStream = new AnonymousPipeClientStream(PipeDirection.In, inHandle);
13.             streamReader = new StreamReader(pipeInStream);
14.             do
15.             {
16.                 temp = streamReader.ReadLine();
17.             }
18.             while (!temp.StartsWith("SYNC"));
19.             Debug.Log("Synced in stream");
20.             synced = true;
21.         }
22.         while (true)
23.         {
24.             temp = streamReader.ReadLine(); //if commented out, everything works fine
25.             Debug.Log(temp);
26.             yield return new WaitForSeconds(1f);
27.         }
28.     }

 

StreamReader.ReadLine blocks until it reads a newLine (according to here), so you'll have to check if there's actually data there. The example on MSDN uses StreamReader.Peek() >= 0 to check for that.

 

I have already tried that before and just to be sure tried again, still doesn't work. Freezes exactly the same. Besides i cant find any reference to blocking until new line comes, i can just see that it returns null if there is no new line to read, which was what i was hoping to see in debug.log.

EDIT: Just doing a Peek() without ReadLine() after syncing is enough to freeze the process.