Jens, While you're in there, :) Could you perhaps fix this bug (below) if it still exists?
Date: Thu, 15 Nov 2007 12:07:48 -0500 From: Mark Lord <lkml@xxxxxx> To: Greg KH <gregkh@xxxxxxx> Cc: Yasunori Goto <y-goto@xxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxx>, linux-kernel@xxxxxxxxxxxxxxx Subject: Re: EIP is at device_shutdown+0x32/0x60 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@xxxxxxxxxxxxxxx ... < snip > ... Greg, I don't know if this is relevant or not, but x86 has bugs in the halt/reboot code for SMP. Specifically, in native_smp_send_stop() the code now uses spin_trylock() to "lock" the shared call buffers, but then ignores the result. This means that multiple CPUs can/will clobber each other in that code. The second bug, is that this code does not wait for the target CPUs to actually stop before it continues. This was the real cause of the failure-to-poweroff problems I was having with 2.6.23, which we fixed by using CPU hotplug to disable_nonboot_cpus() before the above code ever got run. Maybe it's related, maybe not.
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