I switched the plugin to "Always group windows" and the panel restarted non stop til it stopped its retries. Not obvious but I can reproduce the bug. Program received signal SIGSEGV, Segmentation fault. xfce_tasklist_update_icon_geometries (data=0x81468a8) at tasklist-widget.c:1590 1590 for (li = tasklist->windows; li != NULL; li = li->next) bt doesn't show anything more interesting #0 xfce_tasklist_update_icon_geometries (data=0x81468a8) at tasklist-widget.c:1590 #1 0xb78aea81 in ?? () from /usr/lib/libglib-2.0.so.0 #2 0xb78b2b72 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0 #3 0xb78b3350 in ?? () from /usr/lib/libglib-2.0.so.0 #4 0xb78b3a1b in g_main_loop_run () from /usr/lib/libglib-2.0.so.0 #5 0xb7ccc409 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #6 0x08054cea in main (argc=1, argv=0xbffff644) at main.c:258
With the latest master? Look a lot like bug #6792.
Ah, sorry, I didn't check if there were commits already. Issue fixed. *** This bug has been marked as a duplicate of bug 6792 ***