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Restarting docker does not clear a container whose shim never sent an exit event: that shim belongs to containerd, a separate unit that survives the restart. Measured on a host carrying two such remnants - docker.service had been restarted hours earlier while containerd.service had been up for three days, and `rm -f`, plain `rm` and `stop -t 1` all still failed afterwards. The hint also has to say what the restart costs. It wipes every exec instance, so following it during a deploy kills the run: an act deploy died after 1h48m with `failed to inspect exec: No such exec instance`, and the log carried no ansible error at all, only post-steps failing in milliseconds. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>