The drive the node uses ran out of disk space. This resulted in a series of errors in a format similar to:
Apr 16 01:58:36 - validator.block: Validation of block BKyJr1hPHwi5eXd71vSmVy6pFiXrFJBMBiByyEtqExBSbS3XYcx failed
Apr 16 01:58:36 - validator.block: Pushed: 2019-04-16T01:58:36Z, Treated: 2019-04-16T01:58:36Z, Failed: 2019-04-16T01:58:36Z
Apr 16 01:58:36 - validator.block: No space left on device
Apr 16 01:58:36 - node.validator.bootstrap_pipeline: Unexpected error (validator): Error:
Apr 16 01:58:36 - node.validator.bootstrap_pipeline: No space left on device
Apr 16 01:58:36 - node.validator.bootstrap_pipeline:
Apr 16 01:58:37 - validator.peer(13): Worker crashed [NetXXXXXXXXXX:idXXXXXXXXXX]:
Apr 16 01:58:37 - validator.peer(13): No space left on device
The node stopped syncing and all peers became disconnected.
I freed up adequate disk space and restarted the node, but it continued to repeat the above errors about being out of disk space and refused to sync, disconnecting from all peers.
How can I get my node to realize there is free space on the drive and resume syncing?