From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id A2E123858C2D; Tue, 12 Apr 2022 15:18:31 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A2E123858C2D
From: "alex_y_xu at yahoo dot ca" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/29039] _dl_tlsdesc_dynamic (sometimes) returns
 garbage offsets
Date: Tue, 12 Apr 2022 15:18:31 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.35
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: alex_y_xu at yahoo dot ca
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: unassigned at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-29039-131-KwB6qH3LAH@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-29039-131@http.sourceware.org/bugzilla/>
References: <bug-29039-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Tue, 12 Apr 2022 15:18:31 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D29039

--- Comment #2 from alex_y_xu at yahoo dot ca ---
(In reply to Florian Weimer from comment #1)
> Is there a way to get glibc debugging information on archlinux? I enabled
> debuginfod, and it downloaded some debugging information, but not for gli=
bc.
>=20
> It looks like the fast path in _dl_tlsdesc_dynamic is taken, and I need to
> check what the data structures look like.

Thanks for looking into this!

As far as I know, Arch Linux currently doesn't have any public debug symbols
for the distro-packaged glibc. If you're more familiar with Ubuntu, that ma=
y be
preferable. It was originally reported on Ubuntu, but I had some issues
installing old Mesa packages on Ubuntu, whereas it is a single command on A=
rch.
I think Ubuntu has debug symbols for glibc though. If you'd like to continue
using Arch, following these steps should build and install a standard glibc
package with debug symbols:

sed -i -e '/^BUILDENV=3D/s/check/!check/' -e '/^OPTIONS=3D/s/!debug/debug/'=
 -e
's/^#MAKEFLAGS=3D"-j2"$/MAKEFLAGS=3D"-j'$(nproc)'"' /etc/makepkg.conf
pacman -S base-devel asp sudo
sed -i -e 's/# %wheel ALL=3D(ALL:ALL) NOPASSWD: ALL/%wheel ALL=3D(ALL:ALL)
NOPASSWD: ALL/' /etc/sudoers
su - user
asp checkout glibc
cd glibc/trunk
gpg --recv-keys 16792B4EA25340F8
makepkg -si

I tested approximately this method and was able to reproduce the issue on b=
are
metal. Alternatively, it may be possible to manually install glibc with
./configure; make; make install. I didn't test this method; it may be neces=
sary
to source /etc/makepkg.conf; export CFLAGS LDFLAGS in order to reproduce the
issue.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=