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    SubjectRe: 2.6.23.1: mdadm/raid5 hung/d-state


    On Mon, 5 Nov 2007, Dan Williams wrote:

    > On 11/4/07, Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
    >>
    >>
    >> On Mon, 5 Nov 2007, Neil Brown wrote:
    >>
    >>> On Sunday November 4, jpiszcz@lucidpixels.com wrote:
    >>>> # ps auxww | grep D
    >>>> USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
    >>>> root 273 0.0 0.0 0 0 ? D Oct21 14:40 [pdflush]
    >>>> root 274 0.0 0.0 0 0 ? D Oct21 13:00 [pdflush]
    >>>>
    >>>> After several days/weeks, this is the second time this has happened, while
    >>>> doing regular file I/O (decompressing a file), everything on the device
    >>>> went into D-state.
    >>>
    >>> At a guess (I haven't looked closely) I'd say it is the bug that was
    >>> meant to be fixed by
    >>>
    >>> commit 4ae3f847e49e3787eca91bced31f8fd328d50496
    >>>
    >>> except that patch applied badly and needed to be fixed with
    >>> the following patch (not in git yet).
    >>> These have been sent to stable@ and should be in the queue for 2.6.23.2
    >>>
    >>
    >> Ah, thanks Neil, will be updating as soon as it is released, thanks.
    >>
    >
    > Are you seeing the same "md thread takes 100% of the CPU" that Joël is
    > reporting?
    >

    Yes, in another e-mail I posted the top output with md3_raid5 at 100%.

    Justin.
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