[PATCH 2/3] fiber: Make sure the guard page is created

[Konstantin Osipov]

* Cyrill Gorcunov <gorcunov at gmail.com> [19/10/02 22:02]:
> The mprotect() syscall may fail due to heavy memory
> pressure (say there is no enough resources to split
> VMAs and etc).
> 
> In this case we must not proceed without guard page
> but refuse to create a new fiber.
> 
> Closes #4541

lgtm

-- 
Konstantin Osipov, Moscow, Russia