linux-kernel - Re: ce56a86e2a ("x86/mm: Limit mmap() of /dev/mem to valid physical addresses"): kernel BUG at arch/x86/mm/physaddr.c:79!

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Message-ID: <440615a7-6cc0-a607-ce7c-22a34b69e8fe@eikelenboom.it>
Date:   Thu, 26 Oct 2017 10:05:02 +0200
From:   Sander Eikelenboom <linux@...elenboom.it>
To:     Craig Bergstrom <craigb@...gle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Fengguang Wu <fengguang.wu@...el.com>, wfg@...ux.intel.com,
        Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
        LKP <lkp@...org>
Subject: Re: ce56a86e2a ("x86/mm: Limit mmap() of /dev/mem to valid physical
 addresses"): kernel BUG at arch/x86/mm/physaddr.c:79!

On 26/10/17 00:02, Craig Bergstrom wrote:
> Thanks for the notification, my apologies for the breakage.  I'll take a
> close look and see if I can figure out what went wrong.
> 
> Sander, any chance you can send /proc/iomem and the inputs to the mmap call
> that fail on your affected system?

Hi Craig,

The output from /proc/iomem is simple to get and attached.
The mmap call is probably issued by qemu and will require more digging.

I don't know if there is that much time left for 4.14, since we are at
RC6 already.

--
Sander


> 
> 
> On Wed, Oct 25, 2017 at 2:50 PM, Boris Ostrovsky <boris.ostrovsky@...cle.com
>> wrote:
> 
>> On 10/23/2017 10:44 PM, Fengguang Wu wrote:
>>> Greetings,
>>>
>>> 0day kernel testing robot got the below dmesg and the first bad commit is
>>>
>>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> master
>>>
>>> commit ce56a86e2ade45d052b3228cdfebe913a1ae7381
>>> Author:     Craig Bergstrom <craigb@...gle.com>
>>> AuthorDate: Thu Oct 19 13:28:56 2017 -0600
>>> Commit:     Ingo Molnar <mingo@...nel.org>
>>> CommitDate: Fri Oct 20 09:48:00 2017 +0200
>>>
>>>      x86/mm: Limit mmap() of /dev/mem to valid physical addresses
>>
>> Also note
>> https://lists.xenproject.org/archives/html/xen-devel/2017-10/msg02935.html
>>
>> -boris
>>
> 


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