[Swift CI] Build Failure: 0. OSS - Swift Incremental RA - Ubuntu 16.04 (master) #10744

12:51:24 error: never saw file appear
12:51:24 note: ./wait-for-file: waiting for file 'node-A-semaphore'
12:51:24 note: file exists, exiting
12:51:24
12:51:24 # command stderr:
12:51:24 llbuild: error: process failed: touch node-A-semaphore && ./wait-for-file node-B-semaphore
1