See downstream bug:
Created attachment 137046 [details] [review]
act-user: Prevent segfault if accounts_proxy is not created
act_user_get_locked may segfault if accounts_proxy is not created (e.g.
when run under root). All other functions which rely on accounts_proxy
already contain checks for NULL and valid ActUser. Do the same also in
act_user_get_locked in order to avoid segfaults in certain cases.
I'm not sure why there would be no account proxy for root, but the fix makes sense regardless!
Attachment 137046 [details] pushed as 3e7b8ec - act-user: Prevent segfault if accounts_proxy is not created
I am not sure, I've just provided fix for that backtrace... but maybe the mentioned patches for g-c-c on that downstream bug will be also needed.