Distro: Slackware64-14.2 xfce4-panel 4.12.0 (Xfce 4.12), Linux 4.4.172. I tested with some of the latest versions of Firefox, but usually I run Palemoon. Problematic characters (with these panel crashes): "⚒️","🌟","☢️", Problematic video examples: https://www.youtube.com/watch?v=zwWmcxwT7Z0 https://www.youtube.com/watch?v=6v8KUJtt_d0 Panel crashes when any web browser when loads youtube videos that contain special characters like "☢️" inside the main video's name title. There is output of the xfce4-panel running/crashing in terminal: /home/vita/.themes/XPLunaSilver/gtk-2.0/panel.rc:395: Background image options specified without filename /home/vita/.themes/XPLunaSilver/gtk-2.0/panel.rc:405: Background image options specified without filename /home/vita/.themes/XPLunaSilver/gtk-2.0/panel.rc:415: Background image options specified without filename xfce4-panel: cairo-scaled-font.c:459: _cairo_scaled_glyph_page_destroy: La declaración `!scaled_font->cache_frozen' no se cumple. Abortado Translate: xfce4-panel: cairo-scaled-font.c:459: _cairo_scaled_glyph_page_destroy: The declaration `!scaled_font->cache_frozen' doesn't accomplish or comply. Aborted Panel restart doesn't help, when you are still have this video tab opened (a youtube video with the special character). When you go backward, or close the tab or anything other than staying at this video page, panel starts fine again (manually). Videos with "🌑","✅","💥","👍","👉","🔥","🚀","⚓","🔋","🔌","🍌","⚡","🐱","🌏","🇺🇸" characters dont crash my panel.
More problematic videos: https://www.youtube.com/watch?v=ELUX1yvAR60
xfce4-panel 4.14 handles all videos fine here.
How I fixed this? Downloaded sources from Slackware: https://mirrors.slackware.com/slackware/slackware64-14.2/source/l/cairo/ Edited the source C file "cairo-1.14.6/src/cairo-scaled-font.c", and added code from: https://cgit.freedesktop.org/cairo/commit/?id=5fd0b8710f125bb33c55d75fcc8252996b403e2d This is the my edited fixed file: http://dpaste.com/17R3NQX After that I just compiled, installed and rebooted!
Created attachment 9020 Just add to your Cairo's src folder
I can't reproduce with 4.12 nor 4.14, cairo 1.17.2 here. I'm closing because this is not a panel bug, if you update to a newer version and the problem persists, try to reach slackware packagers or report this on cairo's bug tracker.