linux-kernel - Re: Regression 4.17-rc1: SSD doesn properly resume causing system hang (NULL pointer dereference)

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Date:   Wed, 25 Apr 2018 07:37:55 +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 properly resume causing system
 hang (NULL pointer dereference)

Dear Bart,

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.

Kind regards,

Paul