Re: linux-next early user mode crash (Was: Re: Transparent Hugepage Support #33)

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

On Thu, Dec 16, 2010 at 06:00:47PM +1100, Stephen Rothwell wrote:
> Hi Paul,
> 
> On Thu, 16 Dec 2010 17:08:14 +1100 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> >
> > On Wed, 15 Dec 2010 21:29:58 -0800 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> > >
> > > RCU problems would normally take longer to run the system out of memory,
> > > but who knows?
> > > 
> > > I did a push into -rcu in the suspect time frame, so have pulled it.  I am
> > > sure that kernel.org will push this change to its mirrors at some point.
> > > Just in case tree-by-tree bisecting is faster than commit-by-commit
> > > bisecting.
> > 
> > I have bisected it down to the rcu tree, so the three commits that were
> > added yesterday are the suspects.  I am still bisecting.  If will just
> > revert those three commits from linux-next today in the hope that Andrew
> > will end up with a working tree.
> 
> Bisect finished:
> 
> 4e40200dab0e673b019979b5b8f5e5d1b25885c2 is first bad commit
> commit 4e40200dab0e673b019979b5b8f5e5d1b25885c2
> Author: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> Date:   Fri Dec 10 15:02:47 2010 -0800
> 
>     rcu: fine-tune grace-period begin/end checks
>     
>     Use the CPU's bit in rnp->qsmask to determine whether or not the CPU
>     should try to report a quiescent state.  Handle overflow in the check
>     for rdp->gpnum having fallen behind.
>     
>     Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
> 
> So far 4 of my 6 boot tests that failed yesterday have succeeded today
> (with those last three rcu commits reverted) - the others are still
> building.

So I blew it not once,  but twice -- once in the patch itself, and once
in messing up my -next process.  :-/

Please accept my apologies!!!

							Thanx, Paul

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