On Tue, Apr 06, 2021 at 06:44:36PM -0700, Michel Lespinasse wrote: > --- a/arch/x86/mm/fault.c > +++ b/arch/x86/mm/fault.c > @@ -1219,6 +1219,8 @@ void do_user_addr_fault(struct pt_regs *regs, > struct mm_struct *mm; > vm_fault_t fault; > unsigned int flags = FAULT_FLAG_DEFAULT; > + struct vm_area_struct pvma; That's 200 bytes on-stack... I suppose that's just about acceptible, but perhaps we need a comment in struct vm_area_struct to make people aware this things lives on-stack and size really is an issue now.