Mike Snitzer <snit...@redhat.com> writes: > 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)
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
