It appears that the current gdb package in feisty (6.5.dfsg-2ubuntu1) does not support the new .gnu.hash sections in ELF objects yet. I get a lot of the following errors when using gdb:
BFD: /lib64/ld-linux-x86-64.so.2: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
warning: Unable to grok dynamic linker /lib64/ld-linux-x86-64.so.2 as an object file
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
BFD: /lib/libpthread.so.0: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while mapping shared library sections:
"/lib/libpthread.so.0": not in executable format: File format not recognized.
BFD: /lib/libdl.so.2: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while mapping shared library sections:
"/lib/libdl.so.2": not in executable format: File format not recognized.
BFD: /lib/libm.so.6: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while mapping shared library sections:
"/lib/libm.so.6": not in executable format: File format not recognized.
BFD: /lib/libc.so.6: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while mapping shared library sections:
"/lib/libc.so.6": not in executable format: File format not recognized.
BFD: /lib/librt.so.1: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while mapping shared library sections:
"/lib/librt.so.1": not in executable format: File format not recognized.
BFD: /lib64/ld-linux-x86-64.so.2: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while mapping shared library sections:
"/lib64/ld-linux-x86-64.so.2": not in executable format: File format not recognized.
BFD: /lib/libpthread.so.0: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while reading shared library symbols:
"/lib/libpthread.so.0": can't read symbols: File format not recognized.
BFD: /lib/libdl.so.2: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while reading shared library symbols:
"/lib/libdl.so.2": can't read symbols: File format not recognized.
BFD: /lib/libm.so.6: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while reading shared library symbols:
"/lib/libm.so.6": can't read symbols: File format not recognized.
BFD: /lib/libc.so.6: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while reading shared library symbols:
"/lib/libc.so.6": can't read symbols: File format not recognized.
BFD: /lib/librt.so.1: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while reading shared library symbols:
"/lib/librt.so.1": can't read symbols: File format not recognized.
BFD: /lib/ld-linux-x86-64.so.2: don't know how to handle OS specific section `.gnu.hash' [0x6ffffff6]
Error while reading shared library symbols:
"/lib/ld-linux-x86-64.so.2": can't read symbols: File format not recognized.
Confirmed here, and it makes gdb totally unusable.