Description of problem:
$ guestfish -i disk.img
Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.
Type: 'help' for a list of commands
'man' to read the manual
'quit' to quit the shell
><fs> upload /bin/bash foo
Version-Release number of selected component (if applicable):
Always. Matt reports that it doesn't hang, but gives a
protocol error instead.
Potentially this is a dupe of bug 576879.
Verified that this does not hang, crash, or lose
synchronization in libguestfs 1.9.18.
*** This bug has been marked as a duplicate of bug 576879 ***