Comment 3 for bug 1751380

Thanks for the description of the earlier fix, that confirms my understanding.

I have just confirmed that removing the call to ca_clear_subscription() in the main() function of the program I attached above allows the deadlock to occur in the call to ca_clear_channel() instead.

The fix is thus to describe these limitations in CAref.html on the 3.14 branch. Patches or merge requests are welcome from anyone with the time to do this.