Index: sys/amd64/amd64/vm_machdep.c
===================================================================
--- sys/amd64/amd64/vm_machdep.c
+++ sys/amd64/amd64/vm_machdep.c
@@ -575,8 +575,6 @@
 	clear_pcb_flags(pcb2, PCB_FPUINITDONE | PCB_USERFPUINITDONE |
 	    PCB_KERNFPU);
 	pcb2->pcb_save = get_pcb_user_save_pcb(pcb2);
-	bcopy(get_pcb_user_save_td(td0), pcb2->pcb_save,
-	    cpu_max_ext_state_size);
 	set_pcb_flags_raw(pcb2, PCB_FULL_IRET);
 
 	/*
@@ -604,7 +602,6 @@
 	/*
 	 * If we didn't copy the pcb, we'd need to do the following registers:
 	 * pcb2->pcb_dr*:	cloned above.
-	 * pcb2->pcb_savefpu:	cloned above.
 	 * pcb2->pcb_onfault:	cloned above (always NULL here?).
 	 * pcb2->pcb_[fg]sbase: cloned above
 	 */
Index: sys/i386/i386/vm_machdep.c
===================================================================
--- sys/i386/i386/vm_machdep.c
+++ sys/i386/i386/vm_machdep.c
@@ -437,8 +437,6 @@
 	pcb2->pcb_flags &= ~(PCB_NPXINITDONE | PCB_NPXUSERINITDONE |
 	    PCB_KERNNPX);
 	pcb2->pcb_save = get_pcb_user_save_pcb(pcb2);
-	bcopy(get_pcb_user_save_td(td0), pcb2->pcb_save,
-	    cpu_max_ext_state_size);
 
 	/*
 	 * Create a new fresh stack for the new thread.
@@ -468,7 +466,6 @@
 	 * If we didn't copy the pcb, we'd need to do the following registers:
 	 * pcb2->pcb_cr3:	cloned above.
 	 * pcb2->pcb_dr*:	cloned above.
-	 * pcb2->pcb_savefpu:	cloned above.
 	 * pcb2->pcb_flags:	cloned above.
 	 * pcb2->pcb_onfault:	cloned above (always NULL here?).
 	 * pcb2->pcb_gs:	cloned above.