Function ktrprocexit

freebsd/kern/kern_ktrace.c:518–547

* When a process exits, drain per-process asynchronous trace records * and disable tracing. */

 * and disable tracing.
 */
void
ktrprocexit(struct thread *td)
{
	struct ktr_request *req;
	struct proc *p;
	struct ucred *cred;
	struct vnode *vp;

	p = td->td_proc;
	if (p->p_traceflag == 0)
		return;

	ktrace_enter(td);
	req = ktr_getrequest_entered(td, KTR_PROCDTOR);
	if (req != NULL)
		ktr_enqueuerequest(td, req);
	sx_xlock(&ktrace_sx);
	ktr_drain(td);
	sx_xunlock(&ktrace_sx);
	PROC_LOCK(p);
	mtx_lock(&ktrace_mtx);
	ktr_freeproc(p, &cred, &vp);
	mtx_unlock(&ktrace_mtx);
	PROC_UNLOCK(p);
	if (vp != NULL)
		vrele(vp);
	if (cred != NULL)
		crfree(cred);
	ktrace_exit(td);
}

static void
ktrprocctor_entered(struct thread *td, struct proc *p)