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It started happening after last upgrade I guess. qemu-nbd fails to find /dev/nbd0 despite it's existence and module being loaded.
$ sudo modprobe nbd max_part=8
$ sudo qemu-nbd --connect /dev/ndb0 /var/lib/libvirt/images/W10.qcow2
qemu-nbd: Failed to open /dev/ndb0: No such file or directory
qemu-nbd: Disconnect client, due to: Failed to read request: Unexpected end-of-file before all bytes were read
$ ls /dev/nbd*
/dev/nbd0 /dev/nbd10 /dev/nbd12 /dev/nbd14 /dev/nbd2 /dev/nbd4 /dev/nbd6 /dev/nbd8
/dev/nbd1 /dev/nbd11 /dev/nbd13 /dev/nbd15 /dev/nbd3 /dev/nbd5 /dev/nbd7 /dev/nbd9
im useless
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