From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 197861] Shutting down a VM with Kernel 4.14 will sometime hang
 and a reboot is the only way to recover.
Date: Wed, 13 Dec 2017 19:17:12 +0000
Message-ID: <bug-197861-28872-auU90a4FYo@https.bugzilla.kernel.org/>
References: <bug-197861-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=197861

--- Comment #12 from Willem de Bruijn (willemb@google.com) ---
> we already know it works according to the bisection
> so I was wondering if we still had to try that ?

It is not strictly necessary, but it would increase confidence
that we found the culprit. I don't know how easy or hard it is
to reproduce for you, so skip if this it too much work.

But in case you can reproduce it, I pushed v4.14 with the
(indeed non-trivial) revert to

  https://github.com/wdebruij/linux/commits/v4.14-revert-copyubufs

If only time for either this or the WARN_ONCE instrumentation,
then that variant is more helpful. Thanks.

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