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Date: Wed, 31 Jul 2019 08:14:52 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Bryan Drewery <bdrewery@FreeBSD.org>
Cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: Re: svn commit: r350005 - head/sys/kern
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On Tue, Jul 30, 2019 at 08:40:28PM -0700, Bryan Drewery wrote:
> This 2nd change alone (&& count1 == 0) was sufficient to fix the endless
> loop problem.
Good, thank you.

> 
> I am not sure how to test the umtxq_check_susp() change. Do I just need
> to ptrace the process?

No, you should create a situation where the python process ends the endless
loop, as reported.  Then, it should become killable by 9 with the first
chunk only applied.