Postgres 10.1 fails to start: server did not start in time

Hey all,
I am in the process of upgrading to Postgres 10, and am having trouble
getting my streaming replica working.

OS: Debian 9.2
Version: 10.1

I have my primary backed up using pgbackrest, and I restore that to my
replica. It generates a recovery.conf which has a restore command for
the WAL to pull them from the pgbackrest server.

The recovery succeeds, but when I go to start the cluster on the
standby, it begins to replay the WAL, and does so for about 30
seconds. Then I get a line in my log saying:

> pg_ctl: server did not start in time

Followed by:

> 2017-11-10 20:27:35.907 UTC [7132] LOG: received smart shutdown request
> ERROR [063]: : terminated on signal [SIGTERM]
> 2017-11-10 20:27:35.911 P00 INFO: archive-get command end: terminated on signal [SIGTERM]
ERROR [063]: : terminated on signal [SIGTERM]
> 2017-11-10 20:27:35.912 P00 INFO: archive-get command end: terminated on signal [SIGTERM]
> 2017-11-10 20:27:35.978 UTC [7142] LOG: shutting down
> 2017-11-10 20:27:36.151 UTC [7132] LOG: database system is shut down

This happens weather I have the server configured as a standby or not.

Any help would be very appreciated.

Thanks,
-Adam