Messages in this thread | | | Date | Wed, 2 Apr 2014 18:48:40 -0400 | From | Dave Jones <> | Subject | Re: rcu_prempt stalls / lockup |
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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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