Bug#722217: legacy304 also

[Wendy J. Elmer]

On Fri, 2013-12-20 at 06:21 +0100, Andreas Beckmann wrote:>
 I am running legacy304, so it is not just legacy173.I
 cannot reproduce any of these bugs in chroots ...D
id anyone investigate what is failing in the preinst?

> Inserting 'set -x' instead of 'exit 0' into the preinst would be more
> helpful to debug this.
> 
> There must be something being run from the libc6 preinst that
> (indirectly) links against libGL ... otherwise I see no way how to
> segfault in libnvidia-tls
> 
> 
> update-alternatives --confix glx
> 
> and selecting mesa-diverted should allow the upgrade to succeed,
> afterwards run it once more and select auto again ...
> 
> 
> Andreas


I have done some testing and I have a sequence that can reproduce the
problem every time.

Note: I currently have and up to date system with libc6 at version
2.17-97:

1. In synaptic mark libc6 for re-installation.
2. synaptic will ask to mark libc6:i386 as a required change so I select
mark(this is an amd64 system).
3. click apply in synaptic
4. synaptic will say libc6 and libc6:i386 are to be re-installed
5. click on apply
6. the installation segfaults in the pre-installation script of
libc6_2.17-97_i386.deb (screenshot attached)
7. note at this point the system is broken and applications like emacs
do not work
8. build a lib6:i386 package with set -x in preinst and dpkg -i it.
9. segfaults on the line "+
exec /usr/share/debconf/frontend /var/lib/dpkg/tmp.ci/preinst upgrade
2.17-97"
10. run apt-get -f install
11. libc6:amd64 not fully installed or removed, apt-get -f install fixes
it
12. note emacs works again at this point and also dpkg -i of previously
segfaulting libc6:i386 also works without error
Note: if I try to reinstall libc6:i386  by itself from from synaptic,
there is no problem.  The problem only occurs when reinstalling libc6 in
synaptic and it also marks libc6:i386 as required.
It is like it starts upgrading libc6 and gets the system in a weird
state when it tries to upgrade libc6:i386 and that fails and then the
whole system is broken.

I can reproduce the sequence over and over so let me know if any other
information would be useful.

Brent


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