linux-kernel - Re: [linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at

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Date: Fri, 22 Dec 2023 10:38:34 +0100
From: David Hildenbrand <david@...hat.com>
To: Oliver Sang <oliver.sang@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Matthew Wilcox <willy@...radead.org>, oe-lkp@...ts.linux.dev, lkp@...el.com,
 Linux Memory Management List <linux-mm@...ck.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master] [mm] bbcbf2a3f0: kernel_BUG_at_mm/memory.c

On 22.12.23 09:13, Oliver Sang wrote:
> hi, David,
> 
> On Thu, Dec 21, 2023 at 11:07:21PM +0100, David Hildenbrand wrote:
>> On 21.12.23 22:58, Andrew Morton wrote:
>>> On Thu, 21 Dec 2023 12:32:04 +0100 David Hildenbrand <david@...hat.com> wrote:
>>>
>>>> On 21.12.23 12:23, Oliver Sang wrote:
>>>>> hi, Andrew Morton,
>>>>>
>>>>> On Wed, Dec 20, 2023 at 02:11:35PM -0800, Andrew Morton wrote:
>>>>>> On Tue, 19 Dec 2023 23:46:50 +0800 kernel test robot <oliver.sang@...el.com> wrote:
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> kernel test robot noticed "kernel_BUG_at_mm/memory.c" on:
>>>>>>>
>>>>>>> commit: bbcbf2a3f05f74f9d268eab57abbdce6a65a94ad ("mm: convert ksm_might_need_to_copy() to work on folios")
>>>>>>
>>>>>> I assume this is a bisection result, so it's quite repeatable?
>>>>>
>>>>> yes, we bisect to this commit, it's quite repeatable:
>>>>>
>>>>> ddd06bb63d9793ce bbcbf2a3f05f74f9d268eab57ab
>>>>> ---------------- ---------------------------
>>>>>           fail:runs  %reproduction    fail:runs
>>>>>               |             |             |
>>>>>               :6          100%           6:6     dmesg.Kernel_panic-not_syncing:Fatal_exception
>>>>>               :6          100%           6:6     dmesg.RIP:do_swap_page
>>>>>               :6          100%           6:6     dmesg.invalid_opcode:#[##]
>>>>>               :6          100%           6:6     dmesg.kernel_BUG_at_mm/memory.c
>>>>>
>>>>>
>>>>
>>>> Can you try with the snipped I sent? Please let me know if you need a
>>>> full patch for testing purposes.
>>>
>>> I think a full patch would be better, please.
>>>
> 
> we cannot reproduce the issue reported previously after applying below patch.

Thanks for verifying and happy holidays!

-- 
Cheers,

David / dhildenb