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    SubjectRe: Deadlocks due to per-process plugging
    On Sun, 15 Jul 2012, Mike Galbraith wrote:

    > On Sun, 2012-07-15 at 10:59 +0200, Thomas Gleixner wrote:
    > > On Fri, 13 Jul 2012, Jan Kara wrote:
    > > > On Fri 13-07-12 16:25:05, Thomas Gleixner wrote:
    > > > > So the patch below should allow the unplug to take place when blocked
    > > > > on mutexes etc.
    > > > Thanks for the patch! Mike will give it some testing.
    > >
    > > I just found out that this patch will explode nicely when the unplug
    > > code runs into a contended lock. Then we try to block on that lock and
    > > make the rtmutex code unhappy as we are already blocked on something
    > > else.
    >
    > Kinda like so? My x3550 M3 just exploded. Aw poo.

    Yep. Would have surprised me if it never triggered.

    > > So no, it's not a solution to the problem. Sigh.
    > >
    > > 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.

    Thanks!


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