system freezes on a simple 2MB test

[VzxPLnHqr]

Tried to run a quick test with qr-backup, using the version which is available in nixpkgs and something odd happened:

# get qr-backup in shell
$ nix shell nixpkgs#qr-backup
# create 2MB test file
$ head -c 2M /dev/urandom > input.bin
# back it up with qr-backup
$ qr-backup input.bin

The system then hangs, and eventually locked up entirely and required hard reboot.

Wondering if this is specific to my system or not. Are you able to successfully complete those steps? How long did it take?