From: Michael Ellerman <mpe@ellerman.id.au>
To: Mike Snitzer <snitzer@redhat.com>
Cc: axboe@kernel.dk, linuxppc-dev@lists.ozlabs.org,
satheera@in.ibm.com,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: System not booting since dm changes? (was Linux 4.20-rc1)
Date: Wed, 07 Nov 2018 11:59:20 +1100 [thread overview]
Message-ID: <871s7xsnx3.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <20181105135157.GA11485@redhat.com>
Mike Snitzer <snitzer@redhat.com> writes:
> On Mon, Nov 05 2018 at 5:25am -0500,
> Michael Ellerman <mpe@ellerman.id.au> wrote:
>
>> Linus Torvalds <torvalds@linux-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)
Thanks.
Looks like CONFIG_SCSI_MQ_DEFAULT is default y, so new configs should
pick that up by default. We must have had an old .config that didn't get
that update.
cheers
next prev parent reply other threads:[~2018-11-07 0:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-05 0:12 Linux 4.20-rc1 Linus Torvalds
2018-11-05 10:25 ` System not booting since dm changes? (was Linux 4.20-rc1) Michael Ellerman
2018-11-05 13:51 ` Mike Snitzer
2018-11-05 14:35 ` Satheesh Rajendran
2018-11-05 15:08 ` Jens Axboe
2018-11-07 0:59 ` Michael Ellerman [this message]
2018-11-06 23:04 ` Linux 4.20-rc1 Darren Hart
2018-11-08 4:40 ` linux-next: stats (Was: Linux 4.20-rc1) Stephen Rothwell
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