---
layout: releasenotes
title: Mono 5.0.1 Release Notes
version: 5.0.1
releasedate: '2017-05-23'
---

Mono 5.0.1 is a service release for the Mono 5.0 series.

## Release History

-   5.0.1.1 - Stable release *(23 May 2017)*

## Bug Fixes

-   [#56275](https://bugzilla.xamarin.com/show_bug.cgi?id=56275) - Unable to copy appname.dll from obj to bin because it is being used by another process - Fixed by earlier disposal of filehandle in pdb2mdb code
-   [#56240](https://bugzilla.xamarin.com/show_bug.cgi?id=56240) - Performance Degradation When Using Expressions - Fixed by making RuntimeHelpers:SufficientExecutionStack () a noop on Android
-   [#56177](https://bugzilla.xamarin.com/show_bug.cgi?id=56177) - peverify fails on FSharp.Core.dll with mono_os_mutex_lock: pthread_mutex_lock failure - Fixed a crash in pedump code
-   [#55858](https://bugzilla.xamarin.com/show_bug.cgi?id=55858) - Microsoft.WebApplication.targets Missing from mono5
-   [#56322](https://bugzilla.xamarin.com/show_bug.cgi?id=56322) - Running nunit tests with domain isolation crashes Mono - Fixed by repairing a handle leak in coop gc
-   [#55988](https://bugzilla.xamarin.com/show_bug.cgi?id=55988) - Apps using Roslyn crash when trying to load Roslyn - Fixed by repairing an assembly loader issue which prevented use of System.ValueTuple
-   [#56260](https://bugzilla.xamarin.com/show_bug.cgi?id=56260) - "This stream does not support writing at System.IO.Compression.DeflateStream.BeginWrite" message
-   [#55087](https://bugzilla.xamarin.com/show_bug.cgi?id=55087) - "System.NotSupportedException: Stack walks are not supported on this platform - System.Reflection.MethodBase.GetCurrentMethod" message on Android

## Contributors

Aleksey Kliger, Alexander Köplinger, Jonathan Chambers, Marek Safar, Martin Baulig, Rodrigo Kumpera, Jo Shields, Zoltan Varga