This blog post recounts a recent debugging session that uncovered a surprising set of issues involving Bash, getcwd()1, and OverlayFS2. What began as a simple customer bug report evolved into a deep dive worth sharing. Initial Bug Report A customer reported that OpenSSH scp3 failed after switching to OverlayFS. We found the following error in the logs: shell-init: error retrieving current directory: \ getcwd: cannot access parent directories: Inappropriate ioctl for device After analyzing the re...