linux-kernel - Re: [PATCH] (repost) Fix SMP poweroff hangs

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Date:	Sun, 30 Sep 2007 14:47:29 -0400
From:	Mark Lord <lkml@....ca>
To:	Santiago Garcia Mantinan <manty@...ty.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] (repost) Fix SMP poweroff hangs

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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