On Mon, Nov 05 2018 at 5:25am -0500, Michael Ellerman <m...@ellerman.id.au> wrote:
> Linus Torvalds <torva...@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
