A JS stream socket wraps a stream, exposing it as a socket for something
on top which needs a socket specifically (e.g. an HTTP server).
If the internal stream is closed in the same tick as the layer on top
attempts to close this stream, the race between doShutdown and doClose
results in an uncatchable exception. A similar race can happen with
doClose and doWrite.
It seems legitimate these can happen in parallel, so this resolves that
by explicitly detecting and handling that situation: if a close is in
progress, both doShutdown & doWrite allow doClose to run
finishShutdown/Write for them, cancelling the operation, without trying
to use this._handle (which will be null) in the meantime.
PR-URL: https://github.com/nodejs/node/pull/49400
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
