lkml.org 
[lkml]   [2013]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: mlockall triggred rcu_preempt stall.
On Tue, Jul 30, 2013 at 10:57:18AM -0700, Paul E. McKenney wrote:
> On Fri, Jul 19, 2013 at 08:32:12PM -0400, Dave Jones wrote:
> > On Fri, Jul 19, 2013 at 03:15:39PM -0700, Paul E. McKenney wrote:
> > > On Fri, Jul 19, 2013 at 10:53:23AM -0400, Dave Jones wrote:
> > > > My fuzz tester keeps hitting this. Every instance shows the non-irq stack
> > > > came in from mlockall. I'm only seeing this on one box, but that has more
> > > > ram (8gb) than my other machines, which might explain it.
> > >
> > > Are you building CONFIG_PREEMPT=n? I don't see any preemption points in
> > > do_mlockall(), so a range containing enough vmas might well stall the
> > > CPU in that case.
> >
> > That was with full preempt.
> >
> > > Does the patch below help? If so, we probably need others, but let's
> > > first see if this one helps. ;-)
> >
> > I'll try it on Monday.
>
> Any news? If I don't hear otherwise, I will assume that the patch did
> not help, and will therefore drop it.

I wasn't able to do any tests yesterday, because I kept hitting other oopses.
I've got patches for the more obvious ones now, so I'll start testing rc3 this
afternoon.

Dave




\
 
 \ /
  Last update: 2013-07-30 20:41    [W:0.048 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site