The variable calibration_run_args defined in the shell script snippet for schema_abort running with predictable replay (here: https://github.com/wiredtiger/wiredtiger/commit/0d9fc801#diff-42f20e21217bd7d4b14489056e1ea24ea2b87599c85413d49182a3b0b721c132R654 ) is not used.  In the following line, first_run_args is not initialized.

This was noticed by sulabh.mahajan@mongodb.com