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On sigwaitinfo or reading from a signalfd, signal processing sets up signal handling via sigdelayed even if the handler address is NULL. This doesn't have any impact on sigwaitinfo scenarios (or at least, I wasn't able to come up with a reproducer) but it breaks signalfd scenarios, where eventually a call to call_signal_handler from sigdelayed will try to call the NULL function. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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