linux-kernel - Re: Sleeping BUG in khugepaged for i586

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Message-ID: <b358d07c-0a5d-9e0e-9468-8ab74ca05595@lwfinger.net>
Date:   Fri, 23 Jun 2017 10:28:49 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     Michal Hocko <mhocko@...nel.org>, Vlastimil Babka <vbabka@...e.cz>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: Sleeping BUG in khugepaged for i586

On 06/23/2017 08:25 AM, Michal Hocko wrote:
> On Fri 23-06-17 15:13:45, Vlastimil Babka wrote:
>> On 06/23/2017 02:08 PM, Michal Hocko wrote:
>>> On Thu 08-06-17 16:48:31, Michal Hocko wrote:
>>>> On Wed 07-06-17 13:56:01, David Rientjes wrote:
>>>>
>>>> I suspect, so cond_resched seems indeed inappropriate on 32b systems.
>>>
>>> The code still seems to be in the mmotm tree.
>>
>> Even mainline at this point - 338a16ba1549
>>
>>> Are there any plans to fix
>>> this or drop the patch?
>>
>> https://lkml.kernel.org/r/alpine.DEB.2.10.1706191341550.97821@chino.kir.corp.google.com
> 
> Ahh, I have missed that. Thanks!

I also missed that patch. Applying it to my box fixes the scheduling while 
atomic splats and no downside has been detected.

You may add "Reported-and-tested-by: Larry Finger <Larry.Finger@...inger.net>".

Thanks for everyone's efforts in fixing this problem.

Larry