Here's a valgrind log from my system. No crash :(, but perhaps something useful here; I ran it for days. (I'm mostly posting this to link to it upstream; it's too big for bugs.gnome.org.)
** Attachment added: "Valgrind log" http://librarian.launchpad.net/6552390/valgrind.log.601 -- [apport] gnome-panel crashed with SIGSEGV in _int_malloc() when upgrading a few packages https://launchpad.net/bugs/81520 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs