Re: [PATCH] s390/livepatch: Implement reliable stack tracing for the consistency model

[Miroslav Benes]

On Sun, 28 Jul 2019, Josh Poimboeuf wrote:

> On Wed, Jul 17, 2019 at 01:01:27PM +0200, Miroslav Benes wrote:
> > > On a related note, do you think it would be feasible to extend (in
> > > another patchset) the reliable stack unwinding code a bit so that we
> > > could feed it pre-baked stacks ... then we could verify that the code
> > > was finding interesting scenarios.  That was a passing thought I had
> > > back when Nicolai and I were debugging the ppc64le exception frame
> > > marker bug, but didn't think it worth the time/effort at the time.
> > 
> > That is an interesting thought. It would help the testing a lot. I will 
> > make a note in my todo list.
> 
> Another idea I had for reliable unwinder testing: add a
> CONFIG_RELIABLE_STACKTRACE_DEBUG option which does a periodic stack
> trace and warns if it doesn't reach the end.  It could triggered from a
> periodic NMI, or from schedule().

Noted as well. 

Miroslav