linux-kernel - Re: [PATCH 5.15 00/23] 5.15.160-rc1 review

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Date: Tue, 28 May 2024 20:38:12 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Jon Hunter <jonathanh@...dia.com>, Chuck Lever III
	<chuck.lever@...cle.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Neil Brown
	<neilb@...e.de>, linux-stable <stable@...r.kernel.org>,
	"patches@...ts.linux.dev" <patches@...ts.linux.dev>, "Linux Kernel Mailing
 List" <linux-kernel@...r.kernel.org>, Linus Torvalds
	<torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>,
	Guenter Roeck <linux@...ck-us.net>, "shuah@...nel.org" <shuah@...nel.org>,
	"patches@...nelci.org" <patches@...nelci.org>, "lkft-triage@...ts.linaro.org"
	<lkft-triage@...ts.linaro.org>, "pavel@...x.de" <pavel@...x.de>,
	"f.fainelli@...il.com" <f.fainelli@...il.com>, "sudipm.mukherjee@...il.com"
	<sudipm.mukherjee@...il.com>, "srw@...dewatkins.net" <srw@...dewatkins.net>,
	"rwarsow@....de" <rwarsow@....de>, "conor@...nel.org" <conor@...nel.org>,
	"allen.lkml@...il.com" <allen.lkml@...il.com>, "broonie@...nel.org"
	<broonie@...nel.org>, "linux-tegra@...r.kernel.org"
	<linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 5.15 00/23] 5.15.160-rc1 review


On 29/05/24 02:18, Jon Hunter wrote:
>
> On 28/05/2024 14:14, Chuck Lever III wrote:
>>
>>
>>> On May 28, 2024, at 5:04 AM, Jon Hunter <jonathanh@...dia.com> wrote:
>>>
>>>
>>> On 25/05/2024 15:20, Greg Kroah-Hartman wrote:
>>>> On Sat, May 25, 2024 at 12:13:28AM +0100, Jon Hunter wrote:
>>>>> Hi Greg,
>>>>>
>>>>> On 23/05/2024 14:12, Greg Kroah-Hartman wrote:
>>>>>> This is the start of the stable review cycle for the 5.15.160 
>>>>>> release.
>>>>>> There are 23 patches in this series, all will be posted as a 
>>>>>> response
>>>>>> to this one.  If anyone has any issues with these being applied, 
>>>>>> please
>>>>>> let me know.
>>>>>>
>>>>>> Responses should be made by Sat, 25 May 2024 13:03:15 +0000.
>>>>>> Anything received after that time might be too late.
>>>>>>
>>>>>> The whole patch series can be found in one patch at:
>>>>>> https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.160-rc1.gz 
>>>>>>
>>>>>> or in the git tree and branch at:
>>>>>> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git 
>>>>>> linux-5.15.y
>>>>>> and the diffstat can be found below.
>>>>>>
>>>>>> thanks,
>>>>>>
>>>>>> greg k-h
>>>>>>
>>>>>> -------------
>>>>>> Pseudo-Shortlog of commits:
>>>>>
>>>>> ...
>>>>>
>>>>>> NeilBrown <neilb@...e.de>
>>>>>>       nfsd: don't allow nfsd threads to be signalled.
>>>>>
>>>>>
>>>>> I am seeing a suspend regression on a couple boards and bisect is 
>>>>> pointing
>>>>> to the above commit. Reverting this commit does fix the issue.
>>>> Ugh, that fixes the report from others.  Can you cc: everyone on that
>>>> and figure out what is going on, as this keeps going back and forth...
>>>
>>>
>>> Adding Chuck, Neil and Chris from the bug report here [0].
>>>
>>> With the above applied to v5.15.y, I am seeing suspend on 2 of our 
>>> boards fail. These boards are using NFS and on entry to suspend I am 
>>> now seeing ...
>>>
>>> Freezing of tasks failed after 20.002 seconds (1 tasks refusing to
>>> freeze, wq_busy=0):
>>>
>>> The boards appear to hang at that point. So may be something else 
>>> missing?
>>
>> Note that we don't have access to hardware like this, so
>> we haven't tested that patch (even the upstream version)
>> with suspend on that hardware.
>
>
> No problem, I would not expect you to have this particular hardware :-)
>
It's probably not much help but for the oops I originally reported we've 
been carrying "nfsd: don't allow nfsd threads to be signalled" locally 
and that resolved it. Now that we've updated to 5.15.160 and dropped the 
local patch it's still resolved for us. Our systems don't make use of 
suspend so they won't hit any issue related to that.
>> So, it could be something missing, or it could be that
>> patch has a problem.
>>
>> It would help us to know if you observe the same issue
>> with an upstream kernel, if that is possible.
>
>
> I don't observe this with either mainline, -next or any other stable 
> branch. So that would suggest that something else is missing from 
> linux-5.15.y.
>
> Jon
>