Okay. Found it. Yes, I was indeed making an assumption. When a signalfd file descriptor is closed, it doesn't remove any of the signals that were in its queue. The next time a signalfd file descriptor is opened for the same signal, therefore, the signal from the closing of the urb on the previous attempt is delivered. Flushing the signalfd file descriptor before closing it resolves the problem. I guess we all know a little bit more about signalfd now. :-_) Thank you for bearing with me.
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