I have several headset to try and only HBH-PV270 has this problem. So it seems to be device dependant and causes compatibility problem. Sam Lin Luiz Augusto von Dentz 提到:
yep, client->dev = NULL seems to be a bug, although by looking the log it seems there is another problem, the sco connection doesn't succeed but it still attempt to send the file descriptor. The logic on a2dp is a little different, since it doesn't start the stream on BT_SETCONFIGURATION_REQ and unlock the sep in any possible error. Btw, I couldn't reproduce the problem here by using aplay, arecord or even both together.
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