eu_tfind is used to facilitate lazy loading throughout libdw.
If a result is not found via eu_tfind, work is done to load
the result and cache it in an eu_search_tree.
Some calls to eu_tfind allow for TOCTOU bugs. Multiple threads
might race to call eu_tfind on some result that hasn't yet been
ca
handle_dynamic_symtab can attempt to read symbol and version data from
file offset of 0 or address of 0 if the associated DT_ tags aren't found.
Fix this by only reading symbol and version data when non-zero file
offsets/addresses have been found.
https://sourceware.org/bugzilla/show_bug.cgi?id=3
