linux-kernel - Re: Regression 4.17-rc1: SSD doesn’t properly resume causing system hang (NULL pointer dereference)

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Message-ID: <db0952af-d603-227e-3d58-ac466eb707a9@molgen.mpg.de>
Date:   Wed, 25 Apr 2018 14:34:50 +0200
From:   Paul Menzel <pmenzel+linux-block@...gen.mpg.de>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     jejb@...ux.vnet.ibm.com, regressions@...mhuis.info,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        martin.petersen@...cle.com, axboe@...nel.dk,
        linux-scsi@...r.kernel.org
Subject: Re: Regression 4.17-rc1: SSD doesn’t properly resume causing system hang (NULL pointer dereference)

Dear Bart,


On 04/25/18 14:26, Bart Van Assche wrote:
> On Wed, 2018-04-25 at 07:37 +0200, Paul Menzel wrote:
>> Am 24.04.2018 um 23:17 schrieb Bart Van Assche:
>>> On Tue, 2018-04-24 at 23:04 +0200, Paul Menzel wrote:
>>>> I applied your change, and rebuilt the Linux kernel. Unfortunately, it
>>>> looks like, it didn’t make a difference.
>>>
>>> In that case I don't know what is causing the failure. Can you run a bisect
>>> to determine which commit introduced this regression?
>>
>> With `scsi_mod.use_blk_mq=n` the system resumes fine, so for to me
>> unknown reasons, that Kconfig option get selected in my Linux kernel
>> configuration. I remember having similar issues when this was enabled by
>> default in Linux 4.13-rc?, so it was just a configuration problem and
>> not a regression. Unfortunately, the Linux configuration files are not
>> under version control, so I cannot check, but it is probably my fault.
>>
>> Sorry for the noise, and please tell me, what I can do to get the option
>> working on this old device.

> Did the same system boot fine with a previous kernel with scsi-mq enabled?

No, as far as I know it never worked, see thread *[Regression 4.13-rc1] 
Resume does not work on Lenovo X60t* [1].

> Anyway, we would like to know what is the root cause such that this NULL
> pointer dereference can be fixed. There are namely plans to remove the
> legacy block layer in the not too distant future.

I’ll be happy to test proposed changes.


Kind regards,

Paul


PS: Your mailer also changed *doesn’t* to *doesn* in the subject line.


[1] https://www.spinics.net/lists/linux-scsi/msg111457.html


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