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Add pgrep diagnostics before/after pkill to identify lingering dockerd processes. If pkill fails and pgrep still finds dockerd, kill by PID directly via os.kill. When inner dockerd can't be killed (still alive), use /dev/shm as data root since the overlay is still full. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>