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ETXTBSY
Why deployment can trigger this error
ETXTBSY is the historical executable-in-use condition. It can occur when software tries to open or modify an executable image in a way that conflicts with execution of that image. The practical case is usually a deployment process replacing a program, interpreter target, or executable artifact in place while another process is running it or the kernel still has an execution-related reference.
The safe response is not to overwrite the active path byte by byte. In-place modification risks both a failed update and an inconsistent executable for processes that start concurrently. On Unix-like systems, creating a complete new file and atomically renaming it into place is normally a safer release pattern, provided the source and destination are on the same filesystem.
What to check
- Find which process has executed or opened the target and whether an update tool is writing the same pathname.
- Use a temporary file in the destination directory, validate it, then rename it atomically.
- Keep executable paths, libraries, and runtime-generated files separate so ordinary data writes cannot collide with deployment files.
- For rolling updates, coordinate process restart and file replacement instead of relying on timing.
References
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