Messages in this thread | | | Date | Thu, 3 May 2012 10:01:01 -0700 | From | "Paul E. McKenney" <> | Subject | Re: rcu: BUG on exit_group |
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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 > <paulmck@linux.vnet.ibm.com> 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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