Re: rcu: qs related lockup on boot

2013-07-15 Thread Sasha Levin
On 07/12/2013 05:15 PM, Paul E. McKenney wrote: Might be we figured out a new way to deadlock RCU and the scheduler, but just in case you rediscovered an old way, could you please try this patch from Peter Zijlstra? http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg464708.html If that

Re: rcu: qs related lockup on boot

2013-07-12 Thread Paul E. McKenney
On Fri, Jul 12, 2013 at 04:34:09PM -0400, Sasha Levin wrote: > Hi all, > > I've stumbled on the following rcu related spew at boot. It happened right > when the > kernel finished up it's boot sequence and passed it to userspace. > > [ 116.549044] BUG: soft lockup - CPU#0 stuck for 30s! [modprob