[Bug libc/12561] ld.so: dlclose() can remove required local scope elements of NODELETE linkmaps

["matz at suse dot de" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12561

--- Comment #3 from Michael Matz <matz at suse dot de> 2011-05-25 15:15:55 UTC ---
Created attachment 5749
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5749
better testcase

Indeed, this is a better testcase really reflecting what the proxy library
does.  The important part is that there needs to be two (independend)
libraries loaded, that one dependency of one of them is nodelete, and has a
finalizer that needs to lookup something in its own dependencies that wasn't
available before.  Then with unpatched glibc:

# make
# /tmp/mm/lib64/ld-linux-x86-64.so.2 --library-path /tmp/mm/lib64/ ./app
./app: symbol lookup error: /suse/matz/src/nodeletebug/lib2.so: undefined
symbol: in_lib3

with patched glibc:
# ./app
#

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