On Tue, Nov 25, 2014 at 09:09:45PM -0800, Linus Torvalds wrote:
> On Nov 25, 2014 8:39 PM, "Jürgen Groß" <jgr...@suse.com> wrote:
> >
> > I COULD trigger it with 3.17. Took much longer, but I've seen it once.
> > And from Xen hypervisor data it was clear it was the same bug (cpu
> > spinning in pmd_lock()).
>
> I'm still hoping you can give a back trace. I'd like to know what access it
> is that can trigger this, and preferably what the call chain to it was...
>
> I do believe it happened in 3.17, I just want to understand the but more -
> not just apply the fix..
>
> Most of Dave's lockup back traces did not have the whole page fault in
> them, so while Dave has seen this too, there might be different symptoms...
Before giving 3.17 a multi-day workout, I'll try rc6 with Jürgen's patch
to see if that makes any difference at all for me.
Dave
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