BitcoindProcess: Reuse BitcoinDaemon class instance in stop call #2743
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We send a `stop` RPC call and wait for the subprocess after receiving a `success/ok` message. This is unnecessary because we received a `success` reply already.
We parse stdout and wait for the "init message: Done loading" line to detect when bitcoind is ready. After seeing this line, we stop reading stdout causing the stdout buffer to fill up. When the stdout buffer fills up, bitcoind waits until its parent process reads from it but this unfortunately never happens leading to a deadlock.
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