Package: libx11-6 Version: 2:1.6.9-2+b1 Severity: important Dear Maintainer,
* What led up to the situation? xfce4-panel crashed. sometime later firefox crashed. The message in both cases was similar: [xcb] Extra reply data still left in queue [xcb] This is most likely caused by a broken X extension library [xcb] Aborting, sorry about that. xfce4-panel: ../../src/xcb_io.c:580: _XReply: Assertion `!xcb_xlib_extra_reply_data_left' failed. [xcb] Extra reply data still left in queue [xcb] This is most likely caused by a broken X extension library [xcb] Aborting, sorry about that. firefox: ../../src/xcb_io.c:580: _XReply: Assertion `!xcb_xlib_extra_reply_data_left' failed. Now firefox and firefox-esr crash immediately on launch. I did manage to restart xfce4-panel successfully. I have not tried restarting my X session, as I have long-running jobs running. I did try updating to the latest (apt upgrade), but no change in symptoms. Reporting against libx11 as that is where the xcb_io.c source file is located. -- System Information: Debian Release: bullseye/sid APT prefers testing APT policy: (990, 'testing'), (500, 'testing-debug'), (500, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 5.6.0-2-amd64 (SMP w/16 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages libx11-6 depends on: ii libc6 2.30-4 ii libx11-data 2:1.6.9-2 ii libxcb1 1.14-2 libx11-6 recommends no packages. libx11-6 suggests no packages. -- no debconf information