Broken pipe when talking to the tools

I do not know how to recreate this. But it looks like you get a broken pipe sometimes when the signer engine talks to its tools.

Oct 20 07:18:42 fou ods-signerd: Resorting signed zone: gatorhole.se
Oct 20 07:18:42 fou ods-signerd: Run command: '/usr/local/libexec/opendnssec/sorter -o gatorhole.se -f /home/rickard/opendnssec/tmp/gatorhole.se.signed -w /home/rickard/opendnssec/tmp/gatorhole.se.signed.sorted'
Oct 20 07:18:42 fou ods-signerd: Writing file to sorter: /home/rickard/opendnssec/tmp/gatorhole.se.signed
Oct 20 07:18:42 fou ods-signerd: Error reading input zone
Oct 20 07:18:42 fou ods-signerd: [Errno 32] Broken pipe
Oct 20 07:18:42 fou ods-signerd: Sorting failed

Do you want any files?