[Dev] Contributing upstream

Luke Shumaker lukeshu at lukeshu.com
Sun Dec 31 18:18:14 GMT 2017


I've talked a bit about it on IRC, but I wanted there to be a real
record: Recently, some of my contributions to Parabola haven't... been
to Parabola.

# glibc

There was a bug in glibc that caused problems in systemd-nspawn that
caused problems in devtools that caused problems in libretools.

I wrote a patchset for it, submitted it upstream, got it on master,
and then it got backported to the 2.26 stable backports branch (we
have breakage in Fedora to thank for speedy backporting).  And then
that filtered back down to Arch glibc!

bug upstream https://sourceware.org/bugzilla/show_bug.cgi?id=22145
bug Arch https://bugs.archlinux.org/task/56529
bug Fedora https://bugzilla.redhat.com/show_bug.cgi?id=1468837
patchset master https://sourceware.org/ml/libc-alpha/2017-11/msg00546.html


The old libre/qemu-static 2.8 was increasingly complaining about
unknown syscalls.  So I went to upgrade it to the latest qemu, 2.11.0.
Now, I discovered a major performance regression in qemu-arm when
statically linked.  As in 3-second startup time before it even starts

I filed a bug upstream, and wrote a patchset, which is applied to the
libre/qemu-user-static package.  The patchset has not yet been
reviewed upstream.

I expect this to attract more attention once one of the major distros
upgrades from 2.10.

bug https://bugs.launchpad.net/qemu/+bug/1740219
patchset https://lists.nongnu.org/archive/html/qemu-devel/2017-12/msg05237.html

The new qemu-user-static package hasn't yet hit i686 yet because I'm
waiting for util-linux 2.31 -> 2.31.1 upgrade from archlinux32.

Happy hacking,
~ Luke Shumaker

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