Re: [PATCH] mm: trigger panic on bad page or PTE states if panic_on_oops

[Kirill A. Shutemov]

On Mon, Mar 16, 2015 at 12:12:54PM +0100, Christian Borntraeger wrote:
> Am 16.03.2015 um 12:00 schrieb Kirill A. Shutemov:
> > On Mon, Mar 16, 2015 at 09:37:01AM +0100, Christian Borntraeger wrote:
> >> while debugging a memory management problem it helped a lot to
> >> get a system dump as early as possible for bad page states.
> >>
> >> Lets assume that if panic_on_oops is set then the system should
> >> not continue with broken mm data structures.
> > 
> > bed_pte is not an oops.
> 
> I know that this is not an oops, but semantically it is like one.  I certainly
> want to a way to hard stop the system if something like that happens.
> 
> Would something like panic_on_mm_error be better?

Or panic_on_taint=<mask> where <mask> is bit-mask of TAINT_* values.

The problem is that TAINT_* will effectevely become part of kernel ABI
and I'm not sure it's good idea.

Oopsing on any taint will have limited usefulness, I think.

-- 
 Kirill A. Shutemov
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