https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71744
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This cache: /* The unseen_objects list contains objects that have been registered but not yet categorized in any way. The seen_objects list has had its pc_begin and count fields initialized at minimum, and is sorted by decreasing value of pc_begin. */ static struct object *unseen_objects; static struct object *seen_objects In "unwind-dw2-fde.c". So there is no global lock by the way, just around the area which accesses the above two objects.
