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    SubjectRe: 2.6.25-mm1: kmmcd NULL pointer dereference at klist_del+0xe/0x30
    On Fri, 9 May 2008 16:47:38 -0700
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > On Fri, 9 May 2008 10:19:56 -0700
    > Andy Isaacson <adi@hexapodia.org> wrote:
    >
    > > Got this twice with 2.6.25-mm1 on my Thinkpad X40, AData 16GB SDHC card
    > > in mmc0 but no filesystem mounted. I think the oops happened at
    > > suspend/resume time. Previous kernel was 2.6.25-rc5-mm1 which didn't
    > > exhibit this problem across multiple suspend-resume cycles.
    > >
    > > Complete logs and pretty much everything else you could want at
    > > http://web.hexapodia.org/~adi/bobble/bobble_2.6.25-mm1-dirty_20080509100634/
    > >
    > > [104375.816331] BUG: unable to handle kernel NULL pointer dereference at 0000000c
    > > [104375.816338] IP: [<c02d86ce>] klist_del+0xe/0x30
    >
    > This could be one of those nasty situations where one driver leaves a mess
    > behind it and then another driver later comes along and trips over that
    > mess.
    >

    There were some problems with removing devices during suspend (which
    the MMC layer does), but AFAIK those patches were backed out and were
    only supposed to come back in a form that allowed such usage. Rafael
    should have the most correct information on that subject.

    Rgds
    --
    -- Pierre Ossman

    Linux kernel, MMC maintainer http://www.kernel.org
    rdesktop, core developer http://www.rdesktop.org


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