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kill -SEGV 1, that tells you nothing about what happens for kernel-generated SIGSEGV, e.g. ifinitactually attempts to dereference an invalid pointer.SIGNAL_UNKILLABLEis set is here, where a new process is created, and ifpid == 1SIGNAL_UNKILLABLEis set. Which supposedly confirms my guess. Or so it seems.