diff --git a/sys/amd64/amd64/vm_machdep.c b/sys/amd64/amd64/vm_machdep.c
--- a/sys/amd64/amd64/vm_machdep.c
+++ b/sys/amd64/amd64/vm_machdep.c
@@ -326,6 +326,12 @@
 	td->td_pcb->pcb_rbx = (long) arg;	/* first arg */
 }
 
+void
+cpu_prepare_init_td(struct thread *td)
+{
+	memset(td->td_frame, 0, sizeof(*td->td_frame));
+}
+
 void
 cpu_exit(struct thread *td)
 {
diff --git a/sys/arm/arm/vm_machdep.c b/sys/arm/arm/vm_machdep.c
--- a/sys/arm/arm/vm_machdep.c
+++ b/sys/arm/arm/vm_machdep.c
@@ -290,6 +290,11 @@
 	td->td_pcb->pcb_regs.sf_r5 = (register_t)arg;	/* first arg */
 }
 
+void
+cpu_prepare_init_td(struct thread *td)
+{
+}
+
 void
 cpu_exit(struct thread *td)
 {
diff --git a/sys/arm64/arm64/vm_machdep.c b/sys/arm64/arm64/vm_machdep.c
--- a/sys/arm64/arm64/vm_machdep.c
+++ b/sys/arm64/arm64/vm_machdep.c
@@ -293,6 +293,11 @@
 	td->td_pcb->pcb_x[PCB_X20] = (uintptr_t)arg;
 }
 
+void
+cpu_prepare_init_td(struct thread *td)
+{
+}
+
 void
 cpu_exit(struct thread *td)
 {
diff --git a/sys/i386/i386/vm_machdep.c b/sys/i386/i386/vm_machdep.c
--- a/sys/i386/i386/vm_machdep.c
+++ b/sys/i386/i386/vm_machdep.c
@@ -324,6 +324,11 @@
 	td->td_pcb->pcb_ebx = (int) arg;	/* first arg */
 }
 
+void
+cpu_prepare_init_td(struct thread *td)
+{
+}
+
 void
 cpu_exit(struct thread *td)
 {
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -784,6 +784,7 @@
 		 */
 		KASSERT((td->td_pflags & TDP_EXECVMSPC) == 0,
 		    ("nested execve"));
+		cpu_prepare_init_td(td);
 		oldvmspace = p->p_vmspace;
 		error = kern_execve(td, &args, NULL, oldvmspace);
 		KASSERT(error != 0,
diff --git a/sys/powerpc/powerpc/vm_machdep.c b/sys/powerpc/powerpc/vm_machdep.c
--- a/sys/powerpc/powerpc/vm_machdep.c
+++ b/sys/powerpc/powerpc/vm_machdep.c
@@ -176,6 +176,11 @@
 	 */
 }
 
+void
+cpu_prepare_init_td(struct thread *td)
+{
+}
+
 /*
  * Intercept the return address from a freshly forked process that has NOT
  * been scheduled yet.
diff --git a/sys/riscv/riscv/vm_machdep.c b/sys/riscv/riscv/vm_machdep.c
--- a/sys/riscv/riscv/vm_machdep.c
+++ b/sys/riscv/riscv/vm_machdep.c
@@ -249,6 +249,11 @@
 	td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
 }
 
+void
+cpu_prepare_init_td(struct thread *td)
+{
+}
+
 void
 cpu_exit(struct thread *td)
 {
diff --git a/sys/sys/proc.h b/sys/sys/proc.h
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -1254,6 +1254,7 @@
 int	cpu_fetch_syscall_args(struct thread *td);
 void	cpu_fork(struct thread *, struct proc *, struct thread *, int);
 void	cpu_fork_kthread_handler(struct thread *, void (*)(void *), void *);
+void	cpu_prepare_init_td(struct thread *td);
 int	cpu_procctl(struct thread *td, int idtype, id_t id, int com,
 	    void *data);
 void	cpu_set_syscall_retval(struct thread *, int);