Re: INFO: possible circular locking dependency detected

From: Dave Jones
Date: Thu Jul 14 2011 - 15:39:42 EST


On Thu, Jul 14, 2011 at 12:34:12PM -0700, Paul E. McKenney wrote:

> Thank you -- you were indeed running with CONFIG_PREEMPT and
> CONFIG_RCU_BOOST, which would be the case for the bug that Steven Rostedt
> found. On reproducing, yes, it could be a bit tough, as the race window
> is rather narrow. I could probably add delays to force the situation htat
> Steven found, but it would be hard to prove that this is your situation.
>
> Dave, was your lockdep splat also with CONFIG_PREEMPT and
> CONFIG_RCU_BOOST?

yeah. which might explain why I haven't seen it since. (I usually have it
disabled, but turn it on occasionally for a 'lets see what breaks' test)

Dave

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