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Date: Thu, 1 Feb 2018 01:48:01 -0800
From: Matthew Wilcox <willy@infradead.org>
Subject: Re: [Bug 198497] New: handle_mm_fault / xen_pmd_val /
 radix_tree_lookup_slot Null pointer
Message-ID: <20180201094801.GB20742@bombadil.infradead.org>
References: <7ba7635e-249a-9071-75bb-7874506bd2b2@redhat.com>
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To: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: xen@randonwebstuff.com, Laura Abbott <labbott@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org

On Thu, Feb 01, 2018 at 08:02:43AM +0900, Tetsuo Handa wrote:
> https://bugzilla.redhat.com/show_bug.cgi?id=1531779
> 
> It might be something related that
> "x86/mm: Found insecure W+X mapping at address" message is printed at boot.
> 
> Are you seeing "x86/mm: Found insecure W+X mapping at address" before
> hitting "BUG: unable to handle kernel NULL pointer dereference" ?

There are about eight different bugs in that thread; the only commonality
I see between them is that there's a null pointer dereference somewhere
in the kernel.

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