Bug 10236 - Mono crashes with async/await
Summary: Mono crashes with async/await
Alias: None
Product: Runtime
Classification: Mono
Component: General ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2013-02-12 06:44 UTC by Sergey Zhukov
Modified: 2013-05-30 13:44 UTC (History)
4 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Sergey Zhukov 2013-02-12 06:44:57 UTC
Mono 3.0.4 crashes when I try to run following code
using System;
using System.Threading.Tasks;

namespace AsyncTest
	class MainClass
		public static void Main (string[] args)
			Console.WriteLine ("Hello World!");

			Test ();


		public static async void Test()
			int x=0;
			await Task.Run(() =>
				for(int i=0;i<1000;i++)

sergey@ubuntu:~/AsyncTest/AsyncTest$ mono-sgen ./Main.exe
Hello World!
* Assertion at mono-threads-posix.c:96, condition `ret' not met

Native stacktrace:

	mono-sgen() [0x80f0d59]
	/lib/i386-linux-gnu/libc.so.6(gsignal+0x4f) [0xb75671df]
	/lib/i386-linux-gnu/libc.so.6(abort+0x175) [0xb756a825]
	mono-sgen() [0x82734bd]
	mono-sgen() [0x8273543]
	mono-sgen() [0x826edfe]
	/lib/i386-linux-gnu/libpthread.so.0(sem_post+0x36) [0xb76eff16]
	mono-sgen(mono_sem_post+0x2a) [0x826a84a]
	mono-sgen() [0x826ee3e]
	/lib/i386-linux-gnu/libpthread.so.0(+0x6d4c) [0xb76e9d4c]
	/lib/i386-linux-gnu/libc.so.6(clone+0x5e) [0xb7627d3e]

mono --version
Mono JIT compiler version 3.0.4 (master/0e6393e Mon Feb  4 14:03:01 PST 2013)

OS: ubuntu 12.04
Comment 1 Sergey Zhukov 2013-03-15 15:23:51 UTC
fixed in mono 3.0.6, please close the bug
Comment 2 Zoltan Varga 2013-03-15 16:08:55 UTC