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Message-ID: <20181105135157.GA11485@redhat.com>
Date: Mon, 5 Nov 2018 08:51:57 -0500
From: Mike Snitzer <snitzer@...hat.com>
To: Michael Ellerman <mpe@...erman.id.au>
Cc: axboe@...nel.dk, linuxppc-dev@...ts.ozlabs.org,
satheera@...ibm.com,
Linus Torvalds <torvalds@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: System not booting since dm changes? (was Linux 4.20-rc1)
On Mon, Nov 05 2018 at 5:25am -0500,
Michael Ellerman <mpe@...erman.id.au> wrote:
> Linus Torvalds <torvalds@...ux-foundation.org> writes:
> ...
> > Mike Snitzer (1):
> > device mapper updates
>
> Hi Mike,
>
> Replying here because I can't find the device-mapper pull or the patch
> in question on LKML. I guess I should be subscribed to dm-devel.
>
> We have a box that doesn't boot any more, bisect points at one of:
>
> cef6f55a9fb4 Mike Snitzer dm table: require that request-based DM be layered on blk-mq devices
> 953923c09fe8 Mike Snitzer dm: rename DM_TYPE_MQ_REQUEST_BASED to DM_TYPE_REQUEST_BASED
> 6a23e05c2fe3 Jens Axboe dm: remove legacy request-based IO path
>
>
> It's a Power8 system running Rawhide, it does have multipath, but I'm
> told it was setup by the Fedora installer, ie. nothing fancy.
>
> The symptom is the system can't find its root filesystem and drops into
> the initramfs shell. The dmesg includes a bunch of errors like below:
>
> [ 43.263460] localhost multipathd[1344]: sdb: fail to get serial
> [ 43.268762] localhost multipathd[1344]: mpatha: failed in domap for addition of new path sdb
> [ 43.268762] localhost multipathd[1344]: uevent trigger error
> [ 43.282065] localhost kernel: device-mapper: table: table load rejected: not all devices are blk-mq request-stackable
...
>
> Any ideas what's going wrong here?
"table load rejected: not all devices are blk-mq request-stackable"
speaks to the fact that you aren't using blk-mq for scsi (aka scsi-mq).
You need to use scsi_mod.use_blk_mq=Y on the kernel commandline (or set
CONFIG_SCSI_MQ_DEFAULT in your kernel config)
Mike
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