rob thijssen
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Two failure modes from the 2026-05-26 beast incident: 1. `unload_all_models` looped through models calling `unload_model`, logging individual failures at warn. The cumulative effect was a single warn line for the failed unload then "shutdown complete" — no signal that the model was actually still loaded. Now each unload is bounded by a 20s timeout, failures escalate to error, and a summary "leaving N model(s) loaded" line fires when anything is stuck so the operator knows the OS will reclaim VRAM after exit. 2. Returning `Ok(())` from `main` after the unload sweep dropped the tokio runtime, which then waited indefinitely on a CUDA-stuck spawn_blocking thread (the journal's "Stack trace of thread 2951308" — spinning on `cuCtxGetCurrent`). systemd's TimeoutStopSec fired 2 minutes later, SIGABRT, core dump. Replacing the return with `std::process::exit(0)` skips the runtime drain and hands the OS a clean exit code; stuck threads get reaped with the process. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>