[Bug 49532] .NET 4.0 and higher fail to install via winetricks

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=49532

Paul Gofman <pgofman at codeweavers.com> changed:

           What    |Removed                     |Added
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                 CC|                            |pgofman at codeweavers.com

--- Comment #17 from Paul Gofman <pgofman at codeweavers.com> ---
Created attachment 68138
  --> https://bugs.winehq.org/attachment.cgi?id=68138
Add SIGQUIT to server block set

I've tested the issue and that was happening in a random way for me. With
default output it was hard to reproduce and much easier with certain logging
added.

It looks like some .net processes hang on termination. All of the threads are
doing normal shutdown when on of them calls ExitProcess. Some of the remaining
threads receive SIGQUIT from wineserver while holding virtual_mutex (freeing VM
from virtual_free_teb) and get force terminated without unlocking it. Meanwhile
the thread which called NtTerminateProcess is spared from getting SIGQUIT, and
locks forever on NtUnmapViewOfSection on virtual mutex.

The attached patch seems to fix the issue for me, at least I was not able
reproduce the hang after several attempts.

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