lib/list_debug.o: warning: objtool: __list_del_entry_valid()+0x9f: unreachable instruction

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9b51f04424e17051a89ab32d892ca66b2a104825
commit: baa41469a7b992c1e3db2a39854219cc7442e48f objtool: Implement stack validation 2.0
date:   6 days ago
config: x86_64-randconfig-in0-07061049 (attached as .config)
compiler: gcc-4.6 (Debian 4.6.4-7) 4.6.4
reproduce:
        git checkout baa41469a7b992c1e3db2a39854219cc7442e48f
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

>> lib/list_debug.o: warning: objtool: __list_del_entry_valid()+0x9f: unreachable instruction

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