Are you seeing these errors on the console of your Xen VPS? These warnings are caused by applications trying to use TLS (Thread Local Storage.) Xen memory management breaks TLS. Run the following command and reboot to get rid of them rm -rf /lib/tls
Some distributions provide a "Xen Friendly" version of glibc to work around this:
This page also recommends running echo "hwcap 0 nosegneg" > /etc/ld.so.conf.d/libc6-xen.conf && ldconfig
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