Will Miao 75fffc1e25 fix(aria2): move stderr drain after _wait_until_ready to avoid swallowing startup errors ...

_drain_stderr and _wait_until_ready both read from the same stderr pipe.
Starting the drain task before _wait_until_ready creates a race where the
drain task consumes aria2's early-exit error message before the startup
waiter can read it, resulting in an empty error message in the logs.

Also confirmed that --fsync does not exist as an aria2 option (exit code
28 = Invalid argument).

2026-06-26 14:32:43 +08:00

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