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Investigate agent freezes
Just creating this to make sure we keep track of this in case we add back the signal handling.
Reportedly, in 0.5.0 workspaces stop being responsive randomly (IDEs, web terminal, everything), the agent is no longer writing logs, and sending it SIGTERM and SIGINT did nothing. SIGKILL and restarting the agent fixes the issue until it happens again.
More details, logs, strace, and the template in https://coder.zendesk.com/agent/tickets/3110