State.bin corruption

While debugging some stuff I'm hitting an error like this while trying to start the node
```
deku-node: internal error, uncaught exception:
End_of_file
Raised at Lwt.Miscellaneous.poll in file "src/core/lwt.ml", line 3095, characters 20-29
Called from Lwt_main.run.run_loop in file "src/unix/lwt_main.ml", line 31, characters 10-20
Called from Lwt_main.run in file "src/unix/lwt_main.ml", line 60, characters 2-13
Re-raised at Lwt_main.run in file "src/unix/lwt_main.ml", line 124, characters 4-13
Called from Dune__exe__Deku_node.node in file "src/bin/deku_node.ml", line 141, characters 13-65
Called from Cmdliner_term.app.(fun) in file "cmdliner_term.ml", line 25, characters 19-24
Called from Cmdliner.Term.run in file "cmdliner.ml", line 117, characters 32-39
```

Hypothesis: when killing the node, state.bin is corrupted.