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SubjectRe: rcu: BUG on exit_group
On Thu, May 03, 2012 at 05:55:14PM +0200, Sasha Levin wrote:
> On Thu, May 3, 2012 at 5:41 PM, Paul E. McKenney
> <> wrote:
> > On Thu, May 03, 2012 at 10:57:19AM +0200, Sasha Levin wrote:
> >> Hi Paul,
> >>
> >> I've hit a BUG similar to the schedule_tail() one when. It happened
> >> when I've started fuzzing exit_group() syscalls, and all of the traces
> >> are starting with exit_group() (there's a flood of them).
> >>
> >> I've verified that it indeed BUGs due to the rcu preempt count.
> >
> > Hello, Sasha,
> >
> > Which version of -next are you using?  I did some surgery on this
> > yesterday based on some bugs Hugh Dickins tracked down, so if you
> > are using something older, please move to the current -next.
> I'm using -next from today (3.4.0-rc5-next-20120503-sasha-00002-g09f55ae-dirty).

Hmmm... Looking at this more closely, it looks like there really is
an attempt to acquire a mutex within an RCU read-side critical section,
which is illegal. Could you please bisect this?

Thanx, Paul

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