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    SubjectRe: apparent regression (crash) -
    11.05.2011 23:19, James Bottomley wrote:
    > On Wed, 2011-05-11 at 08:30 +0200, Jiri Slaby wrote:
    >> On 05/10/2011 09:55 PM, Michael Tokarev wrote:
    >>> Hello.
    >>> I just tried (which has been released today), and
    >>> discovered that it crashes during bootup on my machine.
    >>> with exactly the same config works.
    >> Is it reproducible?

    Yes it is 100% reproducible on at least 2 of my machines,
    happens on every boot.

    >>> Unfortunately I don't have time _right now_ to debug the

    >>> [ 106.761932] input: Logitech USB-PS/2 Optical Mouse as /devices/pci0000:00/0000:00:12.1/usb2/2-2/2-2:1.0/input/input6
    >>> [ 106.762170] generic-usb 0003:046D:C044.0004: input,hidraw0: USB HID v1.10 Mouse [Logitech USB-PS/2 Optical Mouse] on usb-0000:00:12.1-2/input0
    >>> [ 106.994177] scsi 10:0:0:0: Direct-Access Kingston DT HyperX HMAP PQ: 0 ANSI: 0 CCS
    >>> [ 106.994458] sd 10:0:0:0: Attached scsi generic sg3 type 0
    >>> [ 106.994628] BUG: unable to handle kernel NULL pointer dereference at 0000000000000048
    >>> [ 106.994755] IP: [<ffffffff811bec1b>] elv_queue_empty+0x1b/0x30
    > Hmm, it's another missing elevator guard, like this patch:
    > I think the bug here is that q->elevator is null, so dereferencing
    > elevator->ops gives the bug.

    With that patch, both problem machines are now booting
    ok here, so you can add my Tested-By line if you want.

    I wonder why there's so many reports about this issue.

    Speaking of elevator, I've "elevator=cfq" in kernel command
    line, fwiw.

    11.05.2011 11:58, Wolfgang Walter wrote:
    > I got almost the same crash with (whereas worked)
    > with a certain machine. It only (and always) happens if a certain usb-stick is
    > attached when booting. Replacing it with another model "fixed" it.

    I too have an usb storage adaptor here, but it's an internal
    card reader connected to an onboard usb header.

    What's common in both and series in this area?

    Thank you!


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