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    SubjectRe: Deadlocks due to per-process plugging
    On Sun, 2012-07-15 at 11:14 +0200, Mike Galbraith wrote: 
    > On Sun, 2012-07-15 at 10:59 +0200, Thomas Gleixner wrote:

    > > Can you figure out on which lock the stuck thread which did not unplug
    > > due to tsk_is_pi_blocked was blocked?
    > I'll take a peek.

    Sorry for late reply, took a half day away from box. Jan had already
    done the full ext3 IO deadlock analysis:

    Again kjournald is waiting for buffer IO on block 4367635 (sector
    78364838) to finish. Now it is dbench thread 0xffff88026f330e70 which
    has submitted this buffer for IO and is still holding this buffer behind
    its plug (request for sector 78364822..78364846). The dbench thread is
    waiting on j_checkpoint mutex (apparently it has successfully got the
    mutex in the past, checkpointed some buffers, released the mutex and
    hung when trying to acquire it again in the next loop of


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      Last update: 2012-07-16 04:41    [W:0.021 / U:42.180 seconds]
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