I applied "valgrind-3.4.1-x86_64-ldso-strlen.patch" (
http://bugsfiles.kde.org/attachment.cgi?id=33034 ) to the karmic's
valgrind and the errors went away. However, if I uninstall libc6-dbgsym
valgrind becomes totally broken (because it fails to find strlen in
ld.so), basically just what Nicholas Nethercote explained in the
upstream bug: http://bugs.kde.org/show_bug.cgi?id=190429

So this patch is not good for Ubuntu as-is (I wonder if that bug also
happens in Fedora 11 because they seem to carry exactly that patch,
maybe they have libc6-dbg listed as an explicit dependency of their
valgrind package or something though?).

It seems that valgrind devs recommend not stripping ld.so or adding
libc6-dbg as a dependency of the valgrind package. For details see the
file README_PACKAGERS inside the valgrind package.

** Attachment added: "valgrind-3.4.1-x86_64-ldso-strlen.patch"
   http://launchpadlibrarian.net/32723227/ldso_fix.patch

-- 
many errors with glibc 2.10 on x86_64
https://bugs.launchpad.net/bugs/423485
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