From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org, anton@samba.org
Subject: Re: BUG: scheduling while atomic: swapper/0/0x00000002
Date: Mon, 28 Jun 2010 09:49:06 -0700 [thread overview]
Message-ID: <20100628164906.GA6667@linux.vnet.ibm.com> (raw)
In-Reply-To: <20100610010854.GA11432@linux.vnet.ibm.com>
On Wed, Jun 09, 2010 at 06:08:54PM -0700, Paul E. McKenney wrote:
> On Thu, Jun 10, 2010 at 09:20:08AM +1000, Benjamin Herrenschmidt wrote:
> > On Wed, 2010-06-09 at 14:52 -0700, Paul E. McKenney wrote:
> > > Hello!
> > >
> > > I get the following during boot on a 16 CPU Power box. Thoughts?
> > > (/proc/config attached)
> >
> > Wow... looks like the preempt count of the idle task got busted or
> > something ... how reproduceable ? Something like a record of previous
> > interrupts might be useful..
>
> I have seen it only once, but it did get my attention. I will try running
> it again this evening when/if kernel-ml8 is free again. 2.6.35-rc2,
> I should have mentioned.
And it does appear to be reproducible perhaps 50% of boots running
CONFIG_PREEMPT on kernel-ml8. I have not yet seen it on any other system.
Do you have a patch to instrument the interrupts so as to get the info
you need, or should I improvise?
Thanx, Paul
next prev parent reply other threads:[~2010-06-28 16:49 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 21:52 BUG: scheduling while atomic: swapper/0/0x00000002 Paul E. McKenney
2010-06-09 23:20 ` Benjamin Herrenschmidt
2010-06-10 1:08 ` Paul E. McKenney
2010-06-28 16:49 ` Paul E. McKenney [this message]
2010-06-28 21:29 ` Benjamin Herrenschmidt
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