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05b34a4b11
`darwinExportHost.Events` closed its producer channel after destroying the IOKit notification port, but `IONotificationPortDestroy` does not synchronously drain the dispatch queue: a callback block already executing or enqueued could still call `signal()` on the closed channel, or resolve the `cgo.Handle` after `ref.Delete()`. Retain the serial dispatch queue inside the watcher and `dispatch_sync` an empty block before releasing it, so no native callback is in flight when the Go side proceeds. `ServerService.Close` cancelled the context and immediately closed the `ExportHost`. On Darwin that calls `IOUSBHostDevice destroy` for every capture while `darwinServerDataSession.handleSubmit` goroutines may still be inside `IOUSBHostPipe` requests on the same device. Track active sessions, close them explicitly, and wait for the per-session cleanup goroutines via a WaitGroup before tearing down the host.
sing-box
The universal proxy platform.
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Copyright (C) 2022 by nekohasekai <contact-sagernet@sekai.icu>
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