Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> writes: > diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c > index d6375b3c633b..651c558b10eb 100644 > --- a/arch/x86/mm/fault.c > +++ b/arch/x86/mm/fault.c > @@ -1198,6 +1198,9 @@ do_kern_addr_fault(struct pt_regs *regs, unsigned long hw_error_code, > if (is_f00f_bug(regs, hw_error_code, address)) > return; > > + if (dynamic_stack_fault(current, address)) > + return; Probably I'm missing something here, but since you are on the same stack as you are trying to fix up, how can this possibly work? Fault on missing stack #PF <will push more stuff onto the missing stack causing a double fault> You would need a separate stack just to handle this. But the normal page fault handler couldn't use it because it needs to be able to block. Ah I get it -- you handle it in the double fault handler? So every stack grow will be a #DF too? That's scary. -Andi
