From nobody Sun Nov 23 09:57:11 2025
X-Original-To: freebsd-current@mlmmj.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
	by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4dDks13Brgz6Gdwf
	for <freebsd-current@mlmmj.nyi.freebsd.org>; Sun, 23 Nov 2025 09:57:25 +0000 (UTC)
	(envelope-from kostikbel@gmail.com)
Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256)
	(Client did not present a certificate)
	by mx1.freebsd.org (Postfix) with ESMTPS id 4dDks05x0fz3JPD;
	Sun, 23 Nov 2025 09:57:24 +0000 (UTC)
	(envelope-from kostikbel@gmail.com)
Authentication-Results: mx1.freebsd.org;
	none
Received: from tom.home (kib@localhost [127.0.0.1] (may be forged))
	by kib.kiev.ua (8.18.1/8.18.1) with ESMTP id 5AN9vBDJ062451;
	Sun, 23 Nov 2025 11:57:14 +0200 (EET)
	(envelope-from kostikbel@gmail.com)
DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 5AN9vBDJ062451
Received: (from kostik@localhost)
	by tom.home (8.18.1/8.18.1/Submit) id 5AN9vBOj062450;
	Sun, 23 Nov 2025 11:57:11 +0200 (EET)
	(envelope-from kostikbel@gmail.com)
X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f
Date: Sun, 23 Nov 2025 11:57:11 +0200
From: Konstantin Belousov <kostikbel@gmail.com>
To: Michal Meloun <mmel@freebsd.org>
Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: mmap( MAP_ANON) is broken on current. (was Still seeing Failed
 assertion: "p[i] == 0" on armv7 buildworld)
Message-ID: <aSLad1vqFJX27WmG@kib.kiev.ua>
References: <603e75f8-7064-4fca-8520-282331c20ec0@freebsd.org>
 <aSHZiASbyd4rqPIV@kib.kiev.ua>
 <b94a8938-91e5-41da-9686-03a62ab0142f@freebsd.org>
 <aSHqezcjIEXHeaIf@kib.kiev.ua>
 <f3350539-8dca-4d95-810a-f76c7daa7b89@freebsd.org>
 <aSIEzLFD2Xv7GD_a@kib.kiev.ua>
 <9a864c53-0033-46d1-ad07-6b528115789f@freebsd.org>
 <aSIa1Xt47HHMyDQ1@kib.kiev.ua>
 <aSIf9zLhTMVcK5Sj@kib.kiev.ua>
 <9ef6253b-0f3a-4178-bfb2-65cc847ce652@freebsd.org>
List-Id: Discussions about the use of FreeBSD-current <freebsd-current.freebsd.org>
List-Archive: https://lists.freebsd.org/archives/freebsd-current
List-Help: <mailto:freebsd-current+help@freebsd.org>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Subscribe: <mailto:freebsd-current+subscribe@freebsd.org>
List-Unsubscribe: <mailto:freebsd-current+unsubscribe@freebsd.org>
Sender: owner-freebsd-current@FreeBSD.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <9ef6253b-0f3a-4178-bfb2-65cc847ce652@freebsd.org>
X-Spamd-Bar: ----
X-Spamd-Result: default: False [-4.00 / 15.00];
	REPLY(-4.00)[]
X-Rspamd-Pre-Result: action=no action;
	module=replies;
	Message is reply to one we originated
X-Rspamd-Queue-Id: 4dDks05x0fz3JPD

On Sat, Nov 22, 2025 at 11:07:41PM +0100, Michal Meloun wrote:
> uff, we have winner.
> All check passed.

Thank you for the instrumental help.
Patches are put for review at https://reviews.freebsd.org/D53891 .

The problems are machine-independent, it is just that 32bit with
more limited address space and disabled ASLR triggered coalescing
more often (does not matter native 32bit kernel or 32bit userspace
on native 64bit host).

I do think that this deserves EN, but first it needs to be reviewed
and merged to stable branches.  I checked that the problems exist
on stable/14 for sure, I did not looked at stable/13.