Backup server

We have a backup server (via barman) that's not consuming it's WAL files,
and the disk filled up. I made some space on the disk, and now it's doing
this:

2016-05-24 12:24:40 PDT : LOG: redo starts at 44E0/2A091CE0
2016-05-24 12:24:40 PDT : LOG: restored log file
"00000001000044E00000002B" from archive
2016-05-24 12:24:40 PDT : LOG: restored log file
"00000001000044E00000002C" from archive
2016-05-24 12:24:40 PDT : LOG: restored log file
"00000001000044E00000002D" from archive
2016-05-24 12:24:40 PDT : LOG: restored log file
"00000001000044E00000002E" from archive
---snip for brevity, about 30 files ---
2016-05-24 12:24:45 PDT : LOG: restored log file
"00000001000044E000000050" from archive
2016-05-24 12:24:45 PDT : LOG: restored log file
"00000001000044E000000051" from archive
2016-05-24 12:24:45 PDT : LOG: restored log file
"00000001000044E000000052" from archive
2016-05-24 12:24:45 PDT : LOG: restored log file
"00000001000044E000000053" from archive
2016-05-24 12:24:45 PDT : LOG: restored log file
"00000001000044E000000054" from archive
2016-05-24 12:24:45 PDT : LOG: restored log file
"00000001000044E000000055" from archive
2016-05-24 12:24:46 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:24:46 PDT : LOG: consistent recovery state reached at
44E0/56FFE488
2016-05-24 12:24:46 PDT : LOG: database system is ready to accept read
only connections
2016-05-24 12:24:46 PDT : LOG: unexpected pageaddr 44D6/6A000000 in log
segment 00000001000044E000000057, offset 0
2016-05-24 12:24:46 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:24:51 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:24:56 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:01 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:06 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:11 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:16 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:21 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:26 PDT : LOG: restored log file
"00000001000044E000000056" from archive
2016-05-24 12:25:31 PDT : LOG: restored log file
"00000001000044E000000056" from archive

Notice how it's repeating the last file. It does this forever.

If I stop the server and restart, it repeats this exact sequence, starting
with 00000001000044E00000002B.

The recovery.conf file looks like this:

standby_mode = on
restore_command = 'cp /data/pg_wal_ship_dock/%f %p 2>/dev/null'
archive_cleanup_command = '/usr/local/pgsql-9.3.5/bin/pg_archivecleanup
/data/pg_wal_ship_dock %r 2>>cleanup.log'

The /data/pg_wal_ship_doc directory currently has 590GB of WAL files, which
is why the disk got full to begin with. The cleanup.log file is empty.

This is PG 9.3.5 running on Ubuntu.

Any suggestions where to look next?

Thanks,
Craig