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    SubjectRe: [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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