[Bug dynamic-link/29039] _dl_tlsdesc_dynamic (sometimes) returns garbage offsets

["alex_y_xu at yahoo dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29039

--- 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 glibc.
> 
> 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 may 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 Arch.
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=/s/check/!check/' -e '/^OPTIONS=/s/!debug/debug/' -e
's/^#MAKEFLAGS="-j2"$/MAKEFLAGS="-j'$(nproc)'"' /etc/makepkg.conf
pacman -S base-devel asp sudo
sed -i -e 's/# %wheel ALL=(ALL:ALL) NOPASSWD: ALL/%wheel ALL=(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 bare
metal. Alternatively, it may be possible to manually install glibc with
./configure; make; make install. I didn't test this method; it may be necessary
to source /etc/makepkg.conf; export CFLAGS LDFLAGS in order to reproduce the
issue.

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