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    SubjectRe: Commit 7eaceaccab5f40 causing boot hang.
    On 03/31/2011 07:33 AM, Jens Axboe wrote:
    > On 2011-03-31 14:11, Tejun Heo wrote:
    >> Hello,
    >> On Thu, Mar 31, 2011 at 12:37:42PM +0200, Jens Axboe wrote:
    >>> It seems to hard hang, looks very odd:
    >> I think more likely failure mode is something is looping in block path
    >> expecting someone else to do something but as it is busy looping and
    >> preemption isn't enabled the someone else can't proceed. We had a
    >> similar problem in md lately.
    > I think this sound exactly right, and also explains why SMP works. And
    > yes CONFIG_PREEMPT_VOLUNTARY=y is set.
    >> If this is the case, a good way to debug would be triggering sysrq-l
    >> multiple times while the machine is hung and see where the CPU is busy
    >> looping.
    > Doesn't respond to sysrq. I'll poke around.

    Pulled and retested, still hanging for me right after announcing ext3.
    Just FYI.


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