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    SubjectRe: [Regression] 2.6.28-rc1 (2fca5c): libata: kernel cant boot (was: Re: 2.6.27-rc1 (2fca5c): libata: kernel cant boot)
    Date
    On Friday, 24 of October 2008, Jens Axboe wrote:
    > On Fri, Oct 24 2008, Rafael J. Wysocki wrote:
    > > On Friday, 24 of October 2008, Jens Axboe wrote:
    > > > On Fri, Oct 24 2008, Rafael J. Wysocki wrote:
    > > > > On Friday, 24 of October 2008, Jens Axboe wrote:
    > > > > > On Fri, Oct 24 2008, Alexander Beregalov wrote:
    > > > > > > Hi
    > > > > > >
    > > > > > > commit 2fca5ccf97d2c28bcfce44f5b07d85e74e3cd18e
    > > > > > > Author: Jens Axboe <jens.axboe@oracle.com>
    > > > > > > Date: Wed Oct 22 09:34:49 2008 +0200
    > > > > > >
    > > > > > > libata: switch to using block layer tagging support
    > > > > > >
    > > > > > >
    > > > > > > This kernel can not read even 0 sector on disk with rootfs. It
    > > > > > > initialized disk, but cant read it at all.
    > > > > > > CMD646 on Sparc
    > > > > > >
    > > > > > > Rverting helped.
    > > > >
    > > > > Confirmed on hp nx6325 w/ pata_atiixp (apparently, SCSI commands time out).
    > > >
    > > > Basically it'll dererence ->qcmd[] with -1 index so it'll break in
    > > > various interesting ways, I'm sure.
    > > >
    > > > > Reverting the commit also helps here.
    > > > >
    > > > > [I guess it's going to break things left and right.]
    > > >
    > > > Indeed.
    > > >
    > > > > > Doh, how annoying! What driver does that controller use? PATA doesn't
    > > > > > even use NCQ, so it's a bit of an oddity that it makes a difference at
    > > > > > all.
    > > > > >
    > > > > > Can you provide the boot messages?
    > > > >
    > > > > If I'm able to reproduce the breakage of Asus L5D, I will.
    > > >
    > > > I don't need that anymore, I realized the mistake right after sending
    > > > that.
    > >
    > > The fix you posted helps here too. :-)
    >
    > Good, please boot your regression time machine and get it committed
    > before -rc1 was released :-)

    Well, in fact it won't be listed if Linus merges the fix quickly enough. ;-)

    Thanks,
    Rafael


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