On Tue, Oct 03, 2017 at 09:35:18AM -0500, Josh Poimboeuf wrote:
> On Tue, Oct 03, 2017 at 10:44:13PM +0900, Tetsuo Handa wrote:
> > Josh Poimboeuf wrote:
> >
> > > On Tue, Oct 03, 2017 at 12:37:44PM +0200, Borislav Petkov wrote:
> > > > On Tue, Oct 03, 2017 at 07:29:36PM +0900, Tetsuo Handa wrote:
> > > > > Tetsuo Handa wrote:
> > > > > > Tetsuo Handa wrote:
> > > > > > > Tetsuo Handa wrote:
> > > > > > > > I'm seeing below error between
> > > > > > > > 4898b99c261efe32 ("Merge tag 'acpi-4.13-rc7' of
> > > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm")
> > > > > > > > (git bisect good (presumably))
> > > > > > > > e6f3faa734a00c60 ("locking/lockdep: Fix workqueue crossrelease
> > > > > > > > annotation") (git bisect bad) on linux.git .
> > > > > > >
> > > > > > > F.Y.I. This error remains as of 46c1e79fee417f15 ("Merge branch
> > > > > > > 'perf-urgent-for-linus' of
> > > > > > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip") on
> > > > > > > linux.git .
> > > > > > >
> > > > > >
> > > > > > This error still remains as of 6e80ecdddf4ea6f3 ("Merge branch
> > > > > > 'libnvdimm-fixes'
> > > > > > of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm") on
> > > > > > linux.git .
> > > > > >
> > > > > > I'm suspecting that this error is causing very unstable x86_32
> > > > > > kernel.
> > > > > > It seems that this error occurs (though rare frequency) even on
> > > > > > x86_64 kernel.
> > > > > >
> > > > > > Nobody cares?
> > > > > >
> > > > > 4.14-rc3 still trivially panics due to this error. Is this problem
> > > > > known?
> > >
> > > Can you try with the following patch? It should hopefully give more
> > > useful information in the dump.
> > >
> > I see. Here is the result.
>
> Hm, that's not what I expected to happen... I suspect this is stack
> corruption, with the result being slightly different every time. Can
> you see if this patch fixes the panic?
On second thought, I don't think that's the right fix. But I do think
what you're seeing is related to a lockdep issue:
https://lkml.kernel.org/r/20171003140634.r2jzujgl62ox4...@wfg-t540p.sh.intel.com
I'm not sure yet why it's breaking the unwinder so badly though.
--
Josh
