linux-kernel - Re: [lkp] [mm] 7d2eba0557: BUG: unable to handle kernel NULL pointer dereference at (null)

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Message-ID: <alpine.DEB.2.10.1601191430110.7346@chino.kir.corp.google.com>
Date:	Tue, 19 Jan 2016 14:30:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
cc:	kernel test robot <ying.huang@...ux.intel.com>,
	Ebru Akagunduz <ebru.akagunduz@...il.com>, lkp@...org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Xie XiuQi <xiexiuqi@...wei.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Rik van Riel <riel@...hat.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [lkp] [mm] 7d2eba0557: BUG: unable to handle kernel NULL pointer
 dereference at           (null)

On Tue, 19 Jan 2016, Cyrill Gorcunov wrote:

> Seems it should be something like that (untested at moment, please
> take a look).
> ---
> From: Cyrill Gorcunov <gorcunov@...nvz.org>
> Subject: [PATCH] mm: Fix tracepoint for scanning pages
> 
> The page might be NULL so use page_to_pfn in conditional call.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>

I think this is obviously correct, so

Acked-by: David Rientjes <rientjes@...gle.com>

But we'd benefit from a Tested-by from the robot even more.