> 2009-04-08  Joel Brobecker  <brobecker@adacore.com>
> 
>         * target.c (target_mourn_inferior): Call bfd_cache_close_all
>         after having executed the target mourn_inferior routine.

I just checked this patch in.
I also wrote the following testcase, which I checked in as well.

2009-04-14  Joel Brobecker  <brobecker@adacore.com>

        * gdb.base/exe-lock.exp: New testcase.

Tested on x86_64-linux.
-- 
Joel