Message-ID: <46FFEF41.8010104@rtr.ca>
Date: Sun, 30 Sep 2007 14:47:29 -0400
From: Mark Lord <lkml@rtr.ca>
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To: Santiago Garcia Mantinan <manty@manty.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] (repost) Fix SMP poweroff hangs
References: <46FC20B7.4000606@rtr.ca> <200709281455.29069.rjw@sisk.pl> <46FD001A.3070309@rtr.ca> <200709281544.30497.rjw@sisk.pl> <46FD05B8.2040302@rtr.ca> <46FD0724.5060009@rtr.ca> <1190991316.18681.38.camel@chaos> <46FD5BAF.8040304@rtr.ca> <20070930090032.GA2405@pul.manty.net> <46FFDB29.9040400@rtr.ca> <20070930175446.GA2472@pul.manty.net>
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Santiago Garcia Mantinan wrote:
>> I'd say your problem is more of a distro issue,
>> in that the method you are using to shutdown
>> is not actually requesting "poweroff".
> 
>> That last mess above ("System halted.") comes from kernel_halt(),
>> rather than the expected message ("Power down.") from kernel_power_off().
> 
>> So, try using the "poweroff" command instead of "halt",
>> or try using "halt -p".  If neither of those work,
> 
> Well it works ok with 2.6.22 powering off and saying so right before
> powering off, with some references to ACPI. On 2.6.23-rc8 however it doesn't
> seem to get that far.
> 
> I have followed the poweroff of my distro (Debian unstable) and on getting
> to the end of rc 0 it calls halt with options -d -f -i -p. So it does call
> it with the -p you asked for. BTW, this halt comes fom Debian's sysvinit
> version 2.86.ds1-38.1 in case that matters, but as I said it is working ok
> for .22.
> 
> 
>> then edit /etc/init.d/halt and hardcode the "-p" parameter
>> inside there onto the "halt" command line(s).
> 
> That init.d/halt is the one that is calling halt with -d -f -i -p already.

Mmm.. then I wonder why it is not actually getting into the kernel's poweroff function?

Can you boot into single user mode ( kernel command line parameter of S ),
and then remount your filesystems all r/o (ALT-SysRQ-u + ALT-SysRQ-s,
or do it all manually if you prefer).

Then manually try this command from the primary console (Ctrl-ALT-F1):

    /sbin/halt -f -p

The machine *should* poweroff.
If not, then do the whole thing again with this command:

    strace /bin/halt -f -p

And see what the final syscall + parameters is.  Post them here if you can.

Cheers
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