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    SubjectRe: System not booting since dm changes? (was Linux 4.20-rc1)
    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)

    Mike

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