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Index: sys/i386/i386/sys_machdep.c
===================================================================
--- sys/i386/i386/sys_machdep.c
+++ sys/i386/i386/sys_machdep.c
@@ -275,8 +275,7 @@
ext = (struct pcb_ext *)kmem_malloc(kernel_arena, ctob(IOPAGES+1),
M_WAITOK | M_ZERO);
/* -16 is so we can convert a trapframe into vm86trapframe inplace */
- ext->ext_tss.tss_esp0 = td->td_kstack + ctob(td->td_kstack_pages) -
- sizeof(struct pcb) - 16;
+ ext->ext_tss.tss_esp0 = (vm_offset_t)td->td_pcb - 16;
ext->ext_tss.tss_ss0 = GSEL(GDATA_SEL, SEL_KPL);
/*
* The last byte of the i/o map must be followed by an 0xff byte.

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