From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <bug-guix-bounces+larch=yhetil.org@gnu.org>
Received: from mp11.migadu.com ([2001:41d0:8:6d80::])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits))
	by ms5.migadu.com with LMTPS
	id aFC1GV/yQmM7PgEAbAwnHQ
	(envelope-from <bug-guix-bounces+larch=yhetil.org@gnu.org>)
	for <larch@yhetil.org>; Sun, 09 Oct 2022 18:10:07 +0200
Received: from aspmx1.migadu.com ([2001:41d0:8:6d80::])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits))
	by mp11.migadu.com with LMTPS
	id WF7BGV/yQmOLPgEA9RJhRA
	(envelope-from <bug-guix-bounces+larch=yhetil.org@gnu.org>)
	for <larch@yhetil.org>; Sun, 09 Oct 2022 18:10:07 +0200
Received: from lists.gnu.org (lists.gnu.org [209.51.188.17])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by aspmx1.migadu.com (Postfix) with ESMTPS id D83882B01F
	for <larch@yhetil.org>; Sun,  9 Oct 2022 18:10:06 +0200 (CEST)
Received: from localhost ([::1]:33916 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <bug-guix-bounces+larch=yhetil.org@gnu.org>)
	id 1ohYsP-0005LD-5F
	for larch@yhetil.org; Sun, 09 Oct 2022 12:10:05 -0400
Received: from eggs.gnu.org ([2001:470:142:3::10]:55994)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <Debian-debbugs@debbugs.gnu.org>)
 id 1ohYsM-0005L5-OF
 for bug-guix@gnu.org; Sun, 09 Oct 2022 12:10:02 -0400
Received: from debbugs.gnu.org ([209.51.188.43]:45715)
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)
 (Exim 4.90_1) (envelope-from <Debian-debbugs@debbugs.gnu.org>)
 id 1ohYsM-0000rQ-Fz
 for bug-guix@gnu.org; Sun, 09 Oct 2022 12:10:02 -0400
Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2)
 (envelope-from <Debian-debbugs@debbugs.gnu.org>) id 1ohYsM-0002ty-5W
 for bug-guix@gnu.org; Sun, 09 Oct 2022 12:10:02 -0400
X-Loop: help-debbugs@gnu.org
Subject: bug#58320: Hurd VM fails to boot on AMD EPYC (kvm-amd)
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces@debbugs.gnu.org>
Resent-CC: bug-guix@gnu.org
Resent-Date: Sun, 09 Oct 2022 16:10:02 +0000
Resent-Message-ID: <handler.58320.B58320.166533176011090@debbugs.gnu.org>
Resent-Sender: help-debbugs@gnu.org
X-GNU-PR-Message: followup 58320
X-GNU-PR-Package: guix
X-GNU-PR-Keywords: 
To: 58320@debbugs.gnu.org
Cc: bug-hurd@gnu.org
Received: via spool by 58320-submit@debbugs.gnu.org id=B58320.166533176011090
 (code B ref 58320); Sun, 09 Oct 2022 16:10:02 +0000
Received: (at 58320) by debbugs.gnu.org; 9 Oct 2022 16:09:20 +0000
Received: from localhost ([127.0.0.1]:44789 helo=debbugs.gnu.org)
 by debbugs.gnu.org with esmtp (Exim 4.84_2)
 (envelope-from <debbugs-submit-bounces@debbugs.gnu.org>)
 id 1ohYrf-0002so-FN
 for submit@debbugs.gnu.org; Sun, 09 Oct 2022 12:09:19 -0400
Received: from eggs.gnu.org ([209.51.188.92]:59030)
 by debbugs.gnu.org with esmtp (Exim 4.84_2)
 (envelope-from <ludo@gnu.org>) id 1ohYrc-0002sZ-7p
 for 58320@debbugs.gnu.org; Sun, 09 Oct 2022 12:09:17 -0400
Received: from fencepost.gnu.org ([2001:470:142:3::e]:37870)
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <ludo@gnu.org>)
 id 1ohYrW-0000lk-UD; Sun, 09 Oct 2022 12:09:10 -0400
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org;
 s=fencepost-gnu-org; h=MIME-Version:In-Reply-To:Date:References:Subject:To:
 From; bh=cKeEyRypRNhax9v6g3NG+Stj7qNY+pdOG+9zmygYvaA=; b=CBwrAcGYw6A5VzahyDJW
 gC2sELro+LSjnZhqSxse31vSRocMWYOtmZU3aohucmnpc8/Qa8QdOWJjZUk3rQCDZ9Dvl5E0xO0jZ
 7+lzf/LgSA1jnL5vKVZG1nyqCYPCnlahkyJf90DbnF9F4MUtgupP6u5Z5IhOtad4vlwmdurfK/9qm
 yT3UEoPwAZubjCiwOPWeAE2eDLI5OSbO5iYZGnZhxfuCO8OcHFi9gtI3mnu0D6Ev764Fi3Olpkh8V
 CdCPV/Zfo8Wg47roh1+45VZrAEHeTPNho41AB2hFtsjlQgJ83Rvpiy4T2XOazdRYqHzyW0sAbCQDm
 CMRHz4SYgTtpCg==;
Received: from 91-160-117-201.subs.proxad.net ([91.160.117.201]:59568
 helo=ribbon)
 by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <ludo@gnu.org>)
 id 1ohYrW-00037L-BE; Sun, 09 Oct 2022 12:09:10 -0400
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
References: <87k05eouh8.fsf@inria.fr> <8735c1nlga.fsf@gnu.org>
 <20221006135316.ijevz5ddnet4aqkr@begin> <87r0zkfvso.fsf@gnu.org>
 <20221006224219.mn7zp7lhzxwlyrpx@begin> <8735c0f3d5.fsf@gnu.org>
 <20221007211643.bma6b5yfaj7a2d4i@begin> <87zge671p0.fsf@gnu.org>
Date: Sun, 09 Oct 2022 18:09:07 +0200
In-Reply-To: <87zge671p0.fsf@gnu.org> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'s
 message of "Sat, 08 Oct 2022 17:52:11 +0200")
Message-ID: <8735bx6kt8.fsf@gnu.org>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
X-BeenThere: debbugs-submit@debbugs.gnu.org
X-Mailman-Version: 2.1.18
Precedence: list
X-BeenThere: bug-guix@gnu.org
List-Id: Bug reports for GNU Guix <bug-guix.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-guix>,
 <mailto:bug-guix-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/bug-guix>
List-Post: <mailto:bug-guix@gnu.org>
List-Help: <mailto:bug-guix-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-guix>,
 <mailto:bug-guix-request@gnu.org?subject=subscribe>
Errors-To: bug-guix-bounces+larch=yhetil.org@gnu.org
Sender: "bug-Guix" <bug-guix-bounces+larch=yhetil.org@gnu.org>
X-Migadu-Flow: FLOW_IN
X-Migadu-Country: US
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org;
	s=key1; t=1665331807;
	h=from:from:sender:sender:reply-to:subject:subject:date:date:
	 message-id:message-id:to:to:cc:cc:mime-version:mime-version:
	 content-type:content-type:
	 content-transfer-encoding:content-transfer-encoding:resent-cc:
	 resent-from:resent-sender:resent-message-id:in-reply-to:in-reply-to:
	 references:references:list-id:list-help:list-unsubscribe:
	 list-subscribe:list-post:dkim-signature;
	bh=cKeEyRypRNhax9v6g3NG+Stj7qNY+pdOG+9zmygYvaA=;
	b=AXPpwXmJ3HfkJZ0W81X+EvcShC7LgWQXqE9BnUlzufKZtz1SgvTDm2k1Yo67tOh9b4yWP9
	JB+yEszPfNFgOSw/GcPZWnJWtSi/uonWyWcQ4OndKlPgNmRyWOltryS080CmEhqXtuFqzJ
	va6/s1VQrV7bgOcdSjFB751RJV0QnJNsV/T/AbNdoViG+coIM2n5k+SBZLlDvjDtmYQslR
	e+EuiEY62K1ultXRtrGuE1Tl2xA2Sr4r9SrZJ1jJs5Bwm7eUjgNven1X7OxYE5GQaBHL/h
	X8PZaGr6f4W5B3VD47Qy/JvZBbOx5dFBEQs+q90DUlJAyGiL3xGCVPIoURc1Gw==
ARC-Seal: i=1; s=key1; d=yhetil.org; t=1665331807; a=rsa-sha256; cv=none;
	b=MH/hJh46O49g9l3R7VVPKxtKFFBK4T3XUA297xjB3bdc96/wzHB33djQwwqPb5rttlogWm
	Ygae8mDR2/254ME4TtCxy4nQgXYZdUVS6mqpxV+EPhnUDZGpZA+9fohrKPVaA5mxOK/iAq
	Y0/o3ar4TH2cmB2GbsmgqxiFxhtkuwHKuADxbLVacfvfuJlYsFc5cUVbtVMW6I14tOXqR8
	Xtyq9ISUwRhnt6V5hmO3Q7z4pZhlSHF+6AqjlAubS7ZUyafzDGieqL3XxL9Qnn85FsFSWc
	WI8cuQNRDHXcwyXCryqL4gvAzpi0wczq57XQfvYEJjSzIp121I+CwBj7ztqLmw==
ARC-Authentication-Results: i=1;
	aspmx1.migadu.com;
	dkim=fail ("headers rsa verify failed") header.d=gnu.org header.s=fencepost-gnu-org header.b=CBwrAcGY;
	dmarc=pass (policy=none) header.from=gnu.org;
	spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org"
X-Migadu-Spam-Score: -3.18
Authentication-Results: aspmx1.migadu.com;
	dkim=fail ("headers rsa verify failed") header.d=gnu.org header.s=fencepost-gnu-org header.b=CBwrAcGY;
	dmarc=pass (policy=none) header.from=gnu.org;
	spf=pass (aspmx1.migadu.com: domain of "bug-guix-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="bug-guix-bounces+larch=yhetil.org@gnu.org"
X-Migadu-Queue-Id: D83882B01F
X-Spam-Score: -3.18
X-Migadu-Scanner: scn0.migadu.com
X-TUID: TVJUhMpVK5BO

Hi!

Ludovic Court=C3=A8s <ludo@gnu.org> skribis:

> $ addr2line -e  /gnu/store/m8afvcgwmrfhvjpd7b0xllk8vv5isd6j-glibc-cross-i=
586-pc-gnu-2.33/lib/ld.so.1 0x1000 0x11627 0x11bb
> ??:0
> /tmp/guix-build-glibc-cross-i586-pc-gnu-2.33.drv-0/glibc-2.33/elf/dl-misc=
.c:333
> :?
>
>
> That=E2=80=99s =E2=80=98_dl_fatal_printf=E2=80=99 calling =E2=80=98_exit=
=E2=80=99; it=E2=80=99s trying to tell us
> something.
>
> I=E2=80=99ll try and rebuild the system with the debugging patches at
> <https://lists.gnu.org/archive/html/bug-hurd/2011-11/msg00038.html>, to
> get early ld.so output, for lack of a better solution=E2=80=A6

I tried adapted the patches above and tried them, but it seems that
=E2=80=98_dl_sysdep_start=E2=80=99 isn=E2=80=99t even reached.  For example=
, I set a breakpoint
on =E2=80=98mach_task_self=E2=80=99 (called from =E2=80=98__mach_init=E2=80=
=99, called from
=E2=80=98_dl_sysdep_start=E2=80=99), but that=E2=80=99s never reached (I=E2=
=80=99m assuming =E2=80=98break/tu=E2=80=99
is reliable, is it?).

The user-space backtrace upon trap remains unhelpful:

--8<---------------cut here---------------start------------->8---
start ext2fs: Hurd server bootstrap: ext2fs[device:hd0s1]Kernel Breakpoint =
trap,=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20
 eip 0xc1030d5b=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20
Breakpoint at  task_resume:     pushl   %ebp=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20
db> debug traps /on=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
db> b task_terminate=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
set breakpoint #2=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
db> c=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20
Kernel Debug trap trap, eip 0xc1030d5b=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
 execkernel: Page fault (14), code=3D6=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20
Stopped at  0x1000:     pushl   0x4(%ebx)=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20
>>>>> user space <<<<<=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x1000(bfffff24,0,0,1160b,0)=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x11627(bfffff9c,0,0,0,2)=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
0x11bb()=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20
--8<---------------cut here---------------end--------------->8---

=E2=80=A6 where:

--8<---------------cut here---------------start------------->8---
$ addr2line -e /gnu/store/4p1kab1c4h7h3kvgcm1hbjja4y5k9x4p-glibc-cross-i586=
-pc-gnu-2.33/lib/ld.so.1 0x11627 0x11bb
/tmp/guix-build-glibc-cross-i586-pc-gnu-2.33.drv-0/glibc-2.33/elf/dl-misc.c=
:333
:?
$ objdump -S /gnu/store/4p1kab1c4h7h3kvgcm1hbjja4y5k9x4p-glibc-cross-i586-p=
c-gnu-2.33/lib/ld.so.1 --start-address=3D0x000011b0 |head -40

/gnu/store/4p1kab1c4h7h3kvgcm1hbjja4y5k9x4p-glibc-cross-i586-pc-gnu-2.33/li=
b/ld.so.1:     file format elf32-i386


Disassembly of section .text:

000011b0 <_start>:
    11b0:       89 e0                   mov    %esp,%eax
    11b2:       83 ec 0c                sub    $0xc,%esp
    11b5:       50                      push   %eax
    11b6:       e8 b5 0a 00 00          call   1c70 <_dl_start>
    11bb:       83 c4 10                add    $0x10,%esp
--8<---------------cut here---------------end--------------->8---

So it would seem that =E2=80=98_dl_start=E2=80=99 is called and somehow the=
n a tail-call
to =E2=80=98_dl_fatal_printf=E2=80=99 is made.

Through a dichotomy I tried to see how far it goes.  The info I have so
far is that ld.so errors out from elf/rtld.c:563 (line 565 is not
reached):

--8<---------------cut here---------------start------------->8---
558:  if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PREL=
INKED)])
559:    {
560:      /* Relocate ourselves so we can do normal function calls and
561:         data access using the global offset table.  */
562:
563:      ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0, 0);
564:    }
565:  bootstrap_map.l_relocated =3D 1;
...
578:  __rtld_malloc_init_stubs ();
--8<---------------cut here---------------end--------------->8---

It=E2=80=99s hard to be more precise because ELF_DYNAMIC_RELOCATE is a macro
that expands to quite a lot of code.

I don=E2=80=99t see the code path that would lead to a =E2=80=98_dl_fatal_p=
rintf=E2=80=99 call
though.

Ideas?  :-)

Ludo=E2=80=99.