linux-kernel - Re: [PATCH] mm: trigger panic on bad page or PTE states if panic_on

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Message-ID: <20150317194053.GA27910@node.dhcp.inet.fi>
Date:	Tue, 17 Mar 2015 21:40:53 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: trigger panic on bad page or PTE states if
 panic_on_oops

On Tue, Mar 17, 2015 at 08:19:19PM +0300, Konstantin Khlebnikov wrote:
> On 16.03.2015 15:15, Kirill A. Shutemov wrote:
> >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.
> 
> Taint bits have associated letters: for example panic_on_taint=OP
> panic on out-of-tree or propriate =)

Works for me.

-- 
 Kirill A. Shutemov
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