Hi, When emacs-27.2p1-gtk3 catches a SIGSEGV and is in the foreground of its terminal, then I get a printf %n in /var/log/messages:
Aug 23 17:52:26 wisconsin emacs: *printf used %n: Fatal error %d: %n%s I first found this by accident, on OpenBSD/powerpc64, after I made a wrong diff in my X server. I caused a SIGSEGV in libX11; emacs caught it and reached the %n in WRKSRC/src/emacs.c:shut_down_emacs() To reproduce the %n, it is enough to run "emacs" in one terminal and "pkill -SEGV emacs" in another terminal. (Something else: 32-bit powerpc libexecinfo seems to have stopped crashing after the switch to ld.lld. It might be possible to enable libexecinfo in emacs, but I have not checked this.) --George
