Hi, the arch issues seemed to be GCC6, -O2 (and x86?) specific [1,2] and was fixed in Arch by compiling libxcb with -O1 [3]. Also, the code where this crash occurred was not changed since the last release.
I would suggest to just ignore that one report. Cheers, Uli [1]: https://lists.freedesktop.org/archives/xcb/2016-June/010818.html [2]: https://lists.freedesktop.org/archives/xcb/2016-June/010819.html [3]: https://bugs.archlinux.org/task/49560 -- A normal person is just someone you don't know well enough yet. - Nettie Wiebe
