It's working fine for me here. So I have to ask some dumb questions: is CONFIG_GRKERNSEC_SIGNAL enabled in your compiled kernel? What's your test case?
Thanks for the report. What was the last kernel you used where you test case worked properly? I've fixed the problem in the current test patch. Forced signals (from an application crashing) were logged properly, but signals sent by a user to a process weren't logged.