kfence_track
struct kfence_track *track =
struct kfence_track alloc_track __guarded_by(&lock);
struct kfence_track free_track __guarded_by(&lock);
const struct kfence_track *track = show_alloc ? &meta->alloc_track : &meta->free_track;
static void kfence_to_kp_stack(const struct kfence_track *track, void **kp_stack)