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Some context behind this change: I’ve been meaning to look into this because I kept running into this crash when working on [other](https://github.com/zed-industries/zed/issues/61040) fixes. Everything worked fine in dev builds, right up until you tried to create a new Agent Thread using an ACP adapter. The crash reports in this instance were throwing me off: I was seeing different things each time. So, I had Fable look into this. It did so by binary-searching the minimum thread stack on which a probe replicating Zed’s exact handler chain can dispatch one message. Full methodology, probe source, and raw numbers can be found in [this gist](https://gist.github.com/yeskunall/2ac2b00f51389d9388d607974f6f8a04). The results of the probe are as follows: | SDK | Minimum stack (dev profile) | vs. 512 KiB GCD budget | |---|---|---| | 1.3.0 | 409,600–413,696 B | fit, ~100 KiB headroom | | 2.0.0 | 507,904–512,000 B | entire budget before runtime overhead | The oversized frames are monomorphized into `agent_servers`, not the SDK crate -- a `[profile.dev.package]` opt-level override on `agent-client-protocol` does **not** fix this (see gist), and optimized builds collapse the frames entirely, which is why only dev builds crashed. It found that the real signature is `fault_address == stack_pointer` on a `com.apple.root.default-qos` thread inside the ACP dispatch specialization, which I then had it verify across six local `.ips` reports. It seems in #61570, we pushed the dispatch chain past the GCD budget, explained further below: `AcpConnection::stdio` polled the ACP client connection future via `background_spawn`, which on macOS executes runnables on [GCD’s](https://developer.apple.com/documentation/DISPATCH) global-queue workers. Those threads have kernel-fixed, unconfigurable [512 KiB stacks]( |
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