I tried this and it works fine for me: ``` $ nbdfuse /tmp/ram --command nbdkit -v -s ./plugins/rust/target/release/examples/libramdisk.so ... $ dd if=/dev/urandom of=/tmp/ram/nbd bs=512 count=1 1+0 records in 1+0 records out 512 bytes copied, 0.000274812 s, 1.9 MB/s $ fusermount3 -u /tmp/ram ``` What version of nbdkit, nbdfuse, etc are you using? On what platform? Did you try it without the log filter?