Unable to start ftp: Write not multiple of tape block size

[VeryEvilHumna]

Context:
Drive: HPE LTO-6 Ultrium 6250
HBA: Broadcom / LSI SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03)
Fedora Linux 43 (Server Edition) x86_64

$ sudo mt -f /dev/nst0 stsetoptions scsi2logical

$ sudo stfs serve ftp     -d /dev/nst0     -m ~/b60681.sqlite     -s pgp     --signature-identity ~/.stfs-pgp.priv     --signature-recipient ~/.stfs-pgp.pub     --signature-password password --compression zstandard     --cache-filesystem-type memory -v4

{"time":1768316747,"level":"TRACE","event":"SQL Query","data":[{"query":"select min(length(name) - length(replace(name, \"/\", \"\"))) as depth, name from headers where deleted != 1"}]}
{"time":1768316747,"level":"TRACE","event":"SQL Query","data":[{"query":"[]"}]}
{"time":1768316747,"level":"DEBUG","event":"FileSystem.InitializeIfEmpty","data":[{"rootPerm":511,"rootProposal":"/"}]}
{"time":1768316747,"level":"TRACE","event":"SQL Query","data":[{"query":"select min(length(name) - length(replace(name, \"/\", \"\"))) as depth, name from headers where deleted != 1"}]}
{"time":1768316747,"level":"TRACE","event":"SQL Query","data":[{"query":"[]"}]}
{"time":1768316747,"level":"TRACE","event":"SQL Query","data":[{"query":"DELETE FROM \"headers\";"}]}
{"time":1768316747,"level":"TRACE","event":"SQL Query","data":[{"query":"[]"}]}
{"time":1768316748,"level":"TRACE","event":"FileSystem.mknodeWithoutLocking","data":[{"initializing":true,"linkname":"","name":"/","overwrite":true,"perm":511}]}
{"time":1768316842,"level":"DEBUG","event":"Header write","data":[{"Type":"archive","Indexed":false,"Header":{"Record":-1,"Lastknownrecord":-1,"Block":-1,"Lastknownblock":-1,"Deleted":0,"Typeflag":53,"Name":"/","Linkname":"","Size":0,"Mode":511,"UID":0,"Gid":0,"Uname":"root","Gname":"0","Modtime":"2026-01-13T18:05:48.071311084+03:00","Accesstime":"0001-01-01T00:00:00Z","Changetime":"0001-01-01T00:00:00Z","Devmajor":0,"Devminor":0,"Paxrecords":"null","Format":4}}]}

Drive seeks to the end and back, it takes around 3 minutes and I don't think that's intentional behaviour

Error: write /dev/nst0: invalid argument
Usage:
  stfs serve ftp [flags]

Aliases:
  ftp, f

Flags:
  -w, --cache-dir string               Directory to use if dir cache is enabled (default "/tmp/stfs")
  -u, --cache-duration duration        Duration until cache is invalidated (default 1h0m0s)
  -n, --cache-filesystem-type string   File system cache to use (default , available are [ memory dir])
  -q, --cache-write-type string        Write cache to use (default file, available are [memory file]) (default "file")
  -l, --compression-level string       Compression level to use (default balanced, available are [fastest balanced smallest]) (default "balanced")
  -i, --encryption-identity string     Path to private key to decrypt with
  -p, --encryption-password string     Password for the private key to decrypt with
  -t, --encryption-recipient string    Path to public key of recipient to encrypt with
  -h, --help                           help for ftp
  -a, --laddr string                   Listen address (default ":1337")
  -j, --read-only                      Block all write operations
  -z, --record-size int                Amount of 512-bit blocks per record (default 20)
  -g, --signature-identity string      Path to private key to sign with
  -x, --signature-password string      Password for the private key to sign with
  -r, --signature-recipient string     Path to the public key to verify with

Global Flags:
  -c, --compression string   Compression format to use (default , available are [ gzip parallelgzip lz4 zstandard brotli bzip2 parallelbzip2])
  -d, --drive string         Tape or tar file to use (default "/dev/nst0")
  -e, --encryption string    Encryption format to use (default , available are [ age pgp])
  -m, --metadata string      Metadata database to use (default "/root/.local/share/stfs/var/lib/stfs/metadata.sqlite")
  -s, --signature string     Signature format to use (default , available are [ minisign pgp])
  -v, --verbose int          Verbosity level (default 2, available are [0 1 2 3 4]) (default 2)

2026/01/13 18:07:22 Error executing command: write /dev/nst0: invalid argument
panic: write /dev/nst0: invalid argument

goroutine 1 [running]:
main.main()
        /home/evil/stfs/cmd/stfs/main.go:12 +0xc5

journalctl:

kernel: st 6:0:0:0: [st0] Write not multiple of tape block size.

There is not enough context to this error or any logs suggesting where it could happen, so I hadn't been able to debug this issue myself