I can confirm this bug. It does only apply to the i386 platform, as amd64 doesn't use libc6-xen at all.
Seems hwcap isn't exported the right way.
Removing /lib/tls is not a preferable solution to this problem, this has been discussed several times. It leads to a very poor performance for threaded applications. The correct way is to find the bug, which may hide somewhere in the vdso-code...(?)
Seems this bug has already been detected during hardy-beta and it is not fixed until now. You should think about renaming LTS to LTB (Long Term Bugs)...