Re-sent with actual attachment. I have managed to catch a SEGFAULT in a long-running Emacs in the debugger. I've been unable to recreate this SEGFAULT on demand, but it seems to be happening when I am attempting to "reset" gnus after switching my work VPN on/off. I will keep the gdb session up an running in case there is some more that can be done with this. In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0) of 2021-03-07 built on miko Repository revision: c63d2ef59c511c1c48c69a202907b7edfcbb19b3 Repository branch: md5i Windowing system distributor 'The X.Org Foundation', version 11.0.12010000 System Description: Debian GNU/Linux bullseye/sid Configured using: 'configure --without-toolkit-scroll-bars --with-x-toolkit=lucid 'CFLAGS=-O0 -ggdb3'' Configured features: CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF X11 XAW3D XDBE XIM XPM LUCID ZLIB Important settings: value of $LANG: en_US.UTF-8 value of $XMODIFIERS: @im=ibus locale-coding-system: utf-8-unix