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    SubjectRe: rcu_prempt stalls / lockup
    On Wed, Apr 02, 2014 at 09:20:43AM -0700, Paul E. McKenney wrote:
    > On Tue, Apr 01, 2014 at 11:32:45AM -0700, Paul E. McKenney wrote:
    > > On Tue, Apr 01, 2014 at 02:04:14PM -0400, Dave Jones wrote:
    > > > On Tue, Apr 01, 2014 at 10:55:45AM -0700, Paul E. McKenney wrote:
    >
    > [ . . . ]
    >
    > > > > Waiting uninterruptibly. Presumably blocked on mutex_lock(). But
    > > > > you have CONFIG_PROVE_LOCKING(), so any deadlocks should have been
    > > > > reported.
    > > >
    > > > Lockdep had reported something a little earlier (timestamped at 1108.xxxxxx)
    > > > but that's a known false-positive in xfs.
    > >
    > > Yep, I would be very surprised if that was related to the grace-period hang.
    >
    > Ah, but it could be suppressing later lockdep splats. So if this can be
    > reproduced without xfs, we might get additional information from lockdep.

    Hrmph.

    $ git bisect bad
    The merge base 5cb480f6b488128140c940abff3c36f524a334a8 is bad.
    This means the bug has been fixed between 5cb480f6b488128140c940abff3c36f524a334a8 and [455c6fdbd219161bd09b1165f11699d6d73de11c 62c206bd514600d4d73751ade00dca8e488390a3 e086481baf9d0436bdd6e9b739bfa4a83fb89ef5].

    Not sure where to go from here..

    The 'good' news is I can reproduce it pretty reliably now.
    I start my fuzz tester, and immediately do a git diff in my working tree,
    and then boom..

    Dave



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