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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
@@ -564,16 +564,18 @@
pcb2 = td->td_pcb;
+ /* Ensure that td0's pcb is up to date. */
+ fpuexit(td0);
+ if (td0 == curthread)
+ update_pcb_bases(td0->td_pcb);
+
/*
* Copy the upcall pcb. This loads kernel regs.
* Those not loaded individually below get their default
* values here.
*/
- if (td0 == curthread)
- update_pcb_bases(td0->td_pcb);
bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
- clear_pcb_flags(pcb2, PCB_FPUINITDONE | PCB_USERFPUINITDONE |
- PCB_KERNFPU);
+ clear_pcb_flags(pcb2, 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);
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
@@ -428,14 +428,21 @@
/* Point the pcb to the top of the stack. */
pcb2 = td->td_pcb;
+ /* Ensure that td0's pcb is up to date. */
+ if (td0 == curthread)
+ td0->td_pcb->pcb_gs = rgs();
+ critical_enter();
+ if (PCPU_GET(fpcurthread) == td0)
+ npxsave(td0->td_pcb->pcb_save);
+ critical_exit();
+
/*
* Copy the upcall pcb. This loads kernel regs.
* Those not loaded individually below get their default
* values here.
*/
bcopy(td0->td_pcb, pcb2, sizeof(*pcb2));
- pcb2->pcb_flags &= ~(PCB_NPXINITDONE | PCB_NPXUSERINITDONE |
- PCB_KERNNPX);
+ pcb2->pcb_flags &= ~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);
@@ -463,7 +470,6 @@
pcb2->pcb_esp = (int)td->td_frame - sizeof(void *); /* trampoline arg */
pcb2->pcb_ebx = (int)td; /* trampoline arg */
pcb2->pcb_eip = (int)fork_trampoline + setidt_disp;
- pcb2->pcb_gs = rgs();
/*
* If we didn't copy the pcb, we'd need to do the following registers:
* pcb2->pcb_cr3: cloned above.

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