Looking at the sources of accountsservice 0.6.21-6ubuntu5: there's only one place where on_get_unix_user_finished invokes g_cancellable_is_cancelled, and it's introduced by debian/patches/9001-manage_pending_ck_calls_with_cancellable.patch:
if (new_session->cancellable == NULL || g_cancellable_is_cancelled (new_session->cancellable)) { return; } It appears that there's a race: new_session->cancellable is reset to NULL between the check and the g_cancellable_is_cancelled call. That patch mentions https://bugs.freedesktop.org/show_bug.cgi?id=50112 and http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=673185. ** Bug watch added: freedesktop.org Bugzilla #50112 https://bugs.freedesktop.org/show_bug.cgi?id=50112 ** Bug watch added: Debian Bug tracker #673185 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=673185 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1028149 Title: gnome-shell crashed with SIGSEGV in g_cancellable_is_cancelled() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1028149/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs