On 19 October 2017 at 04:34, Eli Zaretskii wrote: >> From: C K Kashyap >> Date: Wed, 18 Oct 2017 18:18:20 -0700 >> >> If I just open the attached file (it's a unicode file) and do nothing but >> C-g C-s a few times quickly, I run into the hang. >> >> I'd appreciate it very much if someone could let me know how I could avoid >> this hang or dig out more information. > > I can see it in Emacs 25.2, but not in the pretest of what will become > Emacs 26.1. So one thing you could do is install that pretest, it's > available from alpha.gnu.org. I don't see a hang, I see an immediate segfault. I build emacs-26 myself. The recipe from "emacs -Q servicelistpage.txt": Type C-g. The crash occurs at -O1 and -O3. It does not occur at -O0. Attached is a gdb backtrace (at -O1 -ggdb3). This is built with the 64-bit mingw-w64 toolchain from MSYS2, up to date as of now, from the fsf emacs-26 branch, with no local patches. commit 68182a471007e4cb72efe53c38af9cb3aae332d2 Author: Eli Zaretskii Date: Sat Oct 28 13:29:29 2017 +0300 git reset --hard origin/emacs-26 git clean -xfd ./autogen.sh ./configure --config-cache --with-modules --without-pop 'CFLAGS=-O1 -ggdb3' make -j8 -Oline See attached for the gdb session transcript.