Avoid using up static TLS surplus in glibc-2.31

[Steve Capper]

Hello,
A bug has been fixed in glibc 2.32 that prevented certain combinations of libraries loading that employed TLS.

https://sourceware.org/bugzilla/show_bug.cgi?id=25051

The glibc-2.31 in Debian Bullseye has been fixed with a similar bug raised at:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964141

Specifically the Debian package employed the following patches:
https://salsa.debian.org/glibc-team/glibc/-/blob/bullseye/debian/patches/any/git-surplus-tls-accounting.diff

Could that patch please also be picked up by the glibc-2.31 package in Ubuntu 20.04?

Cheers,
--
Steve Capper

[Michael Hudson-Doyle (mwhudson)]

We tried this before and had to back it out because it makes ld.so and libpthread.so incompatible (https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1926379/comments/8). We could probably try again by removing the part of the patch that adds the tunable but it's a bit "once bitten twice shy" tbh.