Index: sys/amd64/amd64/machdep.c
===================================================================
--- sys/amd64/amd64/machdep.c
+++ sys/amd64/amd64/machdep.c
@@ -2045,6 +2045,7 @@
 int
 fill_frame_regs(struct trapframe *tp, struct reg *regs)
 {
+
 	regs->r_r15 = tp->tf_r15;
 	regs->r_r14 = tp->tf_r14;
 	regs->r_r13 = tp->tf_r13;
@@ -2076,6 +2077,8 @@
 		regs->r_fs = 0;
 		regs->r_gs = 0;
 	}
+	regs->r_err = 0;
+	regs->r_trapno = 0;
 	return (0);
 }
 
Index: sys/amd64/ia32/ia32_reg.c
===================================================================
--- sys/amd64/ia32/ia32_reg.c
+++ sys/amd64/ia32/ia32_reg.c
@@ -105,6 +105,8 @@
 	regs->r_eflags = tp->tf_rflags;
 	regs->r_esp = tp->tf_rsp;
 	regs->r_ss = tp->tf_ss;
+	regs->r_err = 0;
+	regs->r_trapno = 0;
 	return (0);
 }
 
Index: sys/arm/arm/machdep_kdb.c
===================================================================
--- sys/arm/arm/machdep_kdb.c
+++ sys/arm/arm/machdep_kdb.c
@@ -104,6 +104,7 @@
 	regs->r_cpsr = tf->tf_spsr;
 	return (0);
 }
+
 int
 fill_fpregs(struct thread *td, struct fpreg *regs)
 {
@@ -134,8 +135,11 @@
 int
 fill_dbregs(struct thread *td, struct dbreg *regs)
 {
+
+	bzero(regs, sizeof(*regs));
 	return (0);
 }
+
 int
 set_dbregs(struct thread *td, struct dbreg *regs)
 {
Index: sys/fs/procfs/procfs_dbregs.c
===================================================================
--- sys/fs/procfs/procfs_dbregs.c
+++ sys/fs/procfs/procfs_dbregs.c
@@ -112,8 +112,10 @@
 			return (EINVAL);
 		}
 		wrap32 = 1;
-	}
+		memset(&r32, 0, sizeof(r32));
+	} else
 #endif
+		memset(&r, 0, sizeof(r));
 	error = PROC(read, dbregs, td2, &r);
 	if (error == 0) {
 		PROC_UNLOCK(p);
Index: sys/fs/procfs/procfs_fpregs.c
===================================================================
--- sys/fs/procfs/procfs_fpregs.c
+++ sys/fs/procfs/procfs_fpregs.c
@@ -102,7 +102,6 @@
 		return (EBUSY);
 	}
 
-	/* XXXKSE: */
 	td2 = FIRST_THREAD_IN_PROC(p);
 #ifdef COMPAT_FREEBSD32
 	if (SV_CURPROC_FLAG(SV_ILP32)) {
@@ -111,8 +110,10 @@
 			return (EINVAL);
 		}
 		wrap32 = 1;
-	}
+		memset(&r32, 0, sizeof(r32));
+	} else
 #endif
+		memset(&r, 0, sizeof(r));
 	error = PROC(read, fpregs, td2, &r);
 	if (error == 0) {
 		PROC_UNLOCK(p);
Index: sys/fs/procfs/procfs_regs.c
===================================================================
--- sys/fs/procfs/procfs_regs.c
+++ sys/fs/procfs/procfs_regs.c
@@ -102,7 +102,6 @@
 		return (EBUSY);
 	}
 
-	/* XXXKSE: */
 	td2 = FIRST_THREAD_IN_PROC(p);
 #ifdef COMPAT_FREEBSD32
 	if (SV_CURPROC_FLAG(SV_ILP32)) {
@@ -111,8 +110,10 @@
 			return (EINVAL);
 		}
 		wrap32 = 1;
-	}
+		memset(&r32, 0, sizeof(r32));
+	} else
 #endif
+		memset(&r, 0, sizeof(r));
 	error = PROC(read, regs, td2, &r);
 	if (error == 0) {
 		PROC_UNLOCK(p);
Index: sys/i386/i386/machdep.c
===================================================================
--- sys/i386/i386/machdep.c
+++ sys/i386/i386/machdep.c
@@ -2816,6 +2816,7 @@
 int
 fill_frame_regs(struct trapframe *tp, struct reg *regs)
 {
+
 	regs->r_fs = tp->tf_fs;
 	regs->r_es = tp->tf_es;
 	regs->r_ds = tp->tf_ds;
@@ -2831,6 +2832,8 @@
 	regs->r_eflags = tp->tf_eflags;
 	regs->r_esp = tp->tf_esp;
 	regs->r_ss = tp->tf_ss;
+	regs->r_err = 0;
+	regs->r_trapno = 0;
 	return (0);
 }
 
Index: sys/kern/sys_process.c
===================================================================
--- sys/kern/sys_process.c
+++ sys/kern/sys_process.c
@@ -573,7 +573,7 @@
 		struct ptrace_lwpinfo32 pl32;
 		struct ptrace_vm_entry32 pve32;
 #endif
-		char args[nitems(td->td_sa.args) * sizeof(register_t)];
+		char args[sizeof(td->td_sa.args)];
 		int ptevents;
 	} r;
 	void *addr;
@@ -590,11 +590,17 @@
 	addr = &r;
 	switch (uap->req) {
 	case PT_GET_EVENT_MASK:
+	case PT_LWPINFO:
+	case PT_GET_SC_ARGS:
+		break;
 	case PT_GETREGS:
+		bzero(&r.reg, sizeof(r.reg));
+		break;
 	case PT_GETFPREGS:
+		bzero(&r.fpreg, sizeof(r.fpreg));
+		break;
 	case PT_GETDBREGS:
-	case PT_LWPINFO:
-	case PT_GET_SC_ARGS:
+		bzero(&r.dbreg, sizeof(r.dbreg));
 		break;
 	case PT_SETREGS:
 		error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
Index: sys/sparc64/sparc64/machdep.c
===================================================================
--- sys/sparc64/sparc64/machdep.c
+++ sys/sparc64/sparc64/machdep.c
@@ -1056,6 +1056,7 @@
 	bcopy(pcb->pcb_ufp, fpregs->fr_regs, sizeof(fpregs->fr_regs));
 	fpregs->fr_fsr = tf->tf_fsr;
 	fpregs->fr_gsr = tf->tf_gsr;
+	fpregs->fr_pad[0] = 0;
 	return (0);
 }