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Date: Wed, 5 Jul 2017 20:28:49 +0200
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH] mm: mm, mmap: do not blow on PROT_NONE MAP_FIXED holes
 in the stack
Message-ID: <20170705182849.GA18027@dhcp22.suse.cz>
References: <20170705165602.15005-1-mhocko@kernel.org>
 <CA+55aFxxeCtZ-PBqrZK5K2nDjCFBWRMKE09Bz650ZiR2h=b8dg@mail.gmail.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Vlastimil Babka <vbabka@suse.cz>, Ben Hutchings <ben@decadent.org.uk>, Willy Tarreau <w@1wt.eu>, Oleg Nesterov <oleg@redhat.com>, Rik van Riel <riel@redhat.com>, LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>

On Wed 05-07-17 10:43:27, Linus Torvalds wrote:
> On Wed, Jul 5, 2017 at 9:56 AM, Michal Hocko <mhocko@kernel.org> wrote:
> >
> > "mm: enlarge stack guard gap" has introduced a regression in some rust
> > and Java environments which are trying to implement their own stack
> > guard page.  They are punching a new MAP_FIXED mapping inside the
> > existing stack Vma.
> 
> Hmm. What version is this patch against? It doesn't seem to match my 4.12 tree.

Dohh, that was on mmotm which has a clean up by Oleg which reorganizes
the code a bit. This is on top of the current master
---