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    SubjectRe: 2.5 Problem Status Report
    On Wed, Sep 11 2002, Oleg Drokin wrote:
    > Hello!
    >
    > On Wed, Sep 11, 2002 at 09:38:25AM +0200, Ingo Molnar wrote:
    >
    > > > I have preemption disabled.
    > > nevertheless please print out preempt_count() in sched.c - since the big
    > > IRQ cleanups we use the preemption count even if preemption is disabled.
    > > this way we'll know what kind of problem happened - a stuck softirq count,
    > > a stuck hardirq count or an underflow?
    >
    > You was exactly right. preemption count is -1. I inserted chack in
    > dec_preempt_count() and here is updated correct stacktrace. Seems
    > like ide_unmap_buffer is called with some bogus data or something like
    > that. Also I guess the bug is only visible with debug highmem = ON and
    > highmem enabled.

    ok I see the bug. it's due to the imbalanced nature of ide_map_buffer()
    vs ide_unmap_buffer(). i'll cook up a fix right away.

    --
    Jens Axboe

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