linux-kernel - [BUG] hotplug cpus on ia64

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Message-ID: <20080521144840.GA32628@sgi.com>
Date:	Wed, 21 May 2008 09:48:40 -0500
From:	Cliff Wickman <cpw@....com>
To:	dmitry.adamushko@...il.com, avi@...ranet.com, mingo@...e.hu,
	heiko.carstens@...ibm.com, a.p.zijlstra@...llo.nl,
	vatsa@...ux.vnet.ibm.com
Cc:	Avi Kivity <avi@...ranet.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Heiko Carstens <heiko.carstens@...ibm.com>, PeterZijlst@....com
Subject: [BUG] hotplug cpus on ia64

Gentlemen,

  I built an ia64 kernel from Andrew's tree (2.6.26-rc2-mm1)
and get a very predictable hotplug cpu problem.

billberry1:/tmp/cpw # ./dis
disabled cpu 17
enabled cpu 17
billberry1:/tmp/cpw # ./dis
disabled cpu 17
enabled cpu 17
billberry1:/tmp/cpw # ./dis

The script that disables the cpu always hangs (unkillable)
on the 3rd attempt.
I haven't spent any debugging time on it yet.

Just wondering if you've seen it?   It doesn't seem to happen x86_64.

-Cliff Wickman
cpw@....com
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