From owner-freebsd-current@freebsd.org  Wed Jul 29 20:20:42 2015
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Date: Wed, 29 Jul 2015 22:20:26 +0200
Subject: Shutdown fails when there is an active kthread pinned to CPU core 0
From: Michio Honda <micchie@sfc.wide.ad.jp>
To: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>
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Thread-Topic: Shutdown fails when there is an active kthread pinned to CPU
 core 0
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Hi,

When I create a kthread (kthread_add()) and pin it to CPU 0 (sched_bind() i=
n the beginning of its worker function),=20
shutdown (from the command line) is stuck on a message of "Waiting (max 60 =
seconds) for system process `vnlru' to stop..=E2=80=9D. If I pin it to CPU 1 there=
 is no problem.
I=E2=80=99m using FreeBSD CURRENT whose last commit is bf0aa3510005188e55285fbed4=
3d93a34448e377 (on July 3rd).


Do you have any idea to successfully shutdown the system while leaving a kt=
hread pinned on CPU 0?
(I have this problem in the process of implementing a polling kthread for V=
ALE.)

Cheers,
- Michio