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724f2e53c1
A submit marked started has a window before its goroutine reaches engine.Submit. CMD_UNLINK arriving in that window aborted an empty endpoint and then blocked the serve loop forever on the drain channel — the submit entered the engine afterwards with nothing left to cancel it (engines only time out EP0), wedging the session and every Close above it. Linux vhci clients send exactly this sequence on URB timeout. Submits now pass an enterSubmit gate that hands off atomically with unlink: marked-first unlinks make the goroutine skip the engine, and entered submits are aborted with periodic re-aborts to cover the abort racing ahead of the URB inside the driver. Session teardown drains with the same re-abort loop instead of a single pass.
sing-box
The universal proxy platform.
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Copyright (C) 2022 by nekohasekai <contact-sagernet@sekai.icu>
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