[Mono-dev] Recent commits cause problems with thread test cases

[Ludovic Henry]

Hi Bill,

The unhandled exception you observe is due to a race condition which
triggers with the managed test runner. If you use make -C mono/tests
runtest (instead of runtest-managed) you will not get this crash. I am
working on fixing it.

Ludovic

On Fri, 9 Oct 2015, 22:38 Bill Seurer <seurer at linux.vnet.ibm.com> wrote:

> There are a couple of recent commits which cause problems for some
> thread-related things in mono/tests.  At least they do on power.  I did
> a refresh (fetch/rebase) from mono/master just before I tried things a
> few minutes ago so no later commits fixed the problems.
>
> The commits causing grief appear to be these:
>
> commit 7aae649458bceb4375b74f078c4f24ddd4a486f5
> Merge: e6ad2dc e5e97ea
> Author: Rodrigo Kumpera <kumpera at gmail.com>
> Date: Tue Oct 6 10:40:47 2015 -0400
>
> Merge pull request #2060 from ludovic-henry/socket-rework-async
>
> [socket] Complete refactor of Begin/End and Async
>
> commit e6ad2dc73b415e091c80a9912c66e86af1e7a761
> Merge: 0056f1f 388b958
> Author: Rodrigo Kumpera <kumpera at gmail.com>
> Date: Tue Oct 6 10:19:19 2015 -0400
>
> Merge pull request #2110 from ludovic-henry/threadpool-exit-worker
>
> [threadpool-ms] Exit worker thread after 5 to 60 seconds
>
>
> Things worked fine with the commit previous to the above two which is
> this one:
>
> commit 11096e3733b808a8bbfce262c256ec89887cac89
> Author: Ludovic Henry <ludovic at xamarin.com>
> Date: Tue Sep 15 11:21:55 2015 +0100
>
>
> One symptom is tests that hang.  threadpool.cs is one example of that.
>
> The other symptom is this failure:
>
> seurer at genoa:~/mono-git/mono-checkin/mono/tests$ make
> runtest-managed-serial
> Testing bug-2907.exe... passed.
> Testing array-init.exe... passed.
> Testing arraylist.exe...
> Unhandled Exception:
> System.NullReferenceException: Object reference not set to an instance
> of an object
>    at TestRunner+<Main>c__AnonStorey0.<>m__1 (System.Object sender,
> System.Diagnostics.DataReceivedEventArgs e) [0x00066] in
> /home/seurer/mono-git/mono-checkin/mono/tests/test-runner.cs:286
>    at System.Diagnostics.Process.OnOutputDataReceived (System.String
> str) [0x0000d] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System.Diagnostics/Process.cs:1294
>
>    at (wrapper remoting-invoke-with-check)
> System.Diagnostics.Process:OnOutputDataReceived (string)
>    at System.Diagnostics.Process+ProcessAsyncReader.AddInput ()
> [0x00058] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System.Diagnostics/Process.cs:1354
>
>    at System.Diagnostics.Process+ProcessAsyncReader.<BeginRead>m__0
> (System.IOAsyncResult _) [0x00000] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System.Diagnostics/Process.cs:1335
>
>    at
> System.IOSelectorJob.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem
> ()
> [0x00000] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System/IOSelector.cs:143
>
>    at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00096] in
>
> /home/seurer/mono-git/mono-checkin/external/referencesource/mscorlib/system/threading/threadpool.cs:859
>
>    at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback ()
> [0x00000] in
>
> /home/seurer/mono-git/mono-checkin/external/referencesource/mscorlib/system/threading/threadpool.cs:1196
>
>
> Unhandled Exception:
> System.NullReferenceException: Object reference not set to an instance
> of an object
>    at TestRunner+<Main>c__AnonStorey0.<>m__2 (System.Object sender,
> System.Diagnostics.DataReceivedEventArgs e) [0x00066] in
> /home/seurer/mono-git/mono-checkin/mono/tests/test-runner.cs:307
>    at System.Diagnostics.Process.OnErrorDataReceived (System.String str)
> [0x0000d] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System.Diagnostics/Process.cs:1301
>
>    at (wrapper remoting-invoke-with-check)
> System.Diagnostics.Process:OnErrorDataReceived (string)
>    at System.Diagnostics.Process+ProcessAsyncReader.AddInput ()
> [0x00069] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System.Diagnostics/Process.cs:1356
>
>    at System.Diagnostics.Process+ProcessAsyncReader.<BeginRead>m__0
> (System.IOAsyncResult _) [0x00000] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System.Diagnostics/Process.cs:1335
>
>    at
> System.IOSelectorJob.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem
> ()
> [0x00000] in
>
> /home/seurer/mono-git/mono-checkin/mcs/class/System/System/IOSelector.cs:143
>
>    at System.Threading.ThreadPoolWorkQueue.Dispatch () [0x00096] in
>
> /home/seurer/mono-git/mono-checkin/external/referencesource/mscorlib/system/threading/threadpool.cs:859
>
>    at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback ()
> [0x00000] in
>
> /home/seurer/mono-git/mono-checkin/external/referencesource/mscorlib/system/threading/threadpool.cs:1196
>
> make: *** [runtest-managed-serial] Error 255
>
> --
>
> -Bill Seurer
>
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