I am hitting a race condition in timestamp_abort with backups turned on where the child process has a thread in the middle of backup_delete_old_backups and has removed some, but not all, of the files in a backup directory when the parent kills the child process.

Then on restart the parent does a verification of all the backup directories. It tries to verify the partially removed one and fails. Looking at the directory contents in the SAVE directory shows most files are gone.