The i386 glibc isn't built with nosegneg and so during Xen installs, we trigger the printk about segment fixups a lot. The installer has to use the i386 glibc, though, as otherwise, i586 boxes won't continue to work. So we should either a) build i386 glibc with nosegneg by default or b) build an i386 nosegneg glibc and then have anaconda pull that in instead I guess
Should be fixed in glibc-2.4.90-17 (variant a) ).