Comment # 6 on bug 1122182 from
Please try rebooting with "scsi_mod.use_blk_mq=Y" (I won't do that on your
system).

Since 4.20, device mapper uses only blk_mq. But our kernel still defaults to
CONFIG_SCSI_MQ_DEFAULT = "N". This will cause all maps on top of SCSI devices
to fail.

This is likely a bug, but please let's confirm it by checking if the module
parameter works.


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