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    SubjectRe: Commit 7eaceaccab5f40 causing boot hang.
    On 03/31/2011 06:09 AM, Jens Axboe wrote:
    > On 2011-03-31 12:47, Rob Landley wrote:
    >> On 03/31/2011 05:37 AM, Jens Axboe wrote:
    >>>>>> Can you send me your .config?
    >>>>>
    >>>>> It was attached to the first message in this series, here it is again.
    >>>>>
    >>>>> I update it via "make oldconfig" and hold down return.
    >>>>>
    >>>>> I boot it via:
    >>>>>
    >>>>> qemu-system-x86_64 -m 1024 -kernel arch/x86/boot/bzImage \
    >>>>> -hda ~/sid.ext3 -append "root=/dev/hda rw"
    >>>>
    >>>> Much better, I see the hang now! Now to try and diagnose...
    >>>
    >>> It seems to hard hang, looks very odd:
    >>
    >> I should have mentioned that: when it hangs, you can't page back up in
    >> the console display anymore.
    >
    > Data point - only seems to happen on UP. If you add -smp X to kvm, then
    > it boots and works just fine. It smells oddly like some sort of irq
    > event.
    >

    The workaround for this is to disable preemption, by the way.

    Rob


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