A recent update in upstart (0.3.8-1) disabled the use of thread (and thus of __thread). I can confirm the 4gb fixup warning does not fire anymore for init and logd (I've disabled the patch in latest xen-source which hides the warning)
-- mkinitramfs does not bulid a xen-friendly initrd https://launchpad.net/bugs/77972 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
