We got a warning when running bash command step:
19:33:30,500 WARN - sh: 1: /opt/buildagent/temp/command1422920163808942113.sh: Text file busy
It's marked as a warning but caused the entire step to fail, so it should rather be an error.
It also seems to be a bug in QuickBuild (that this warning even occurred) as I assume the issue should not ever appear. I'm not sure why the file was busy, but I might suspect that two separate processes tried to use the same file at the same time. How is the number in the file name generated? It should be unique in all possible cases.