[kees:for-next/fortify 8/8] include/linux/string.h:309:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/fortify
head:   d481d95b725d2abc7ed31f2f8c4c95c2bd8b0282
commit: d481d95b725d2abc7ed31f2f8c4c95c2bd8b0282 [8/8] include/linux/string.h: add the option of fortified string.h functions
config: i386-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout d481d95b725d2abc7ed31f2f8c4c95c2bd8b0282
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/page_32.h:34:0,
                    from arch/x86/include/asm/page.h:13,
                    from arch/x86/include/asm/thread_info.h:11,
                    from include/linux/thread_info.h:37,
                    from arch/x86/include/asm/preempt.h:6,
                    from include/linux/preempt.h:80,
                    from include/linux/spinlock.h:50,
                    from include/linux/mmzone.h:7,
                    from include/linux/gfp.h:5,
                    from include/linux/slab.h:14,
                    from drivers/scsi/csiostor/csio_lnode.c:37:
   In function 'memcpy',
       inlined from 'csio_append_attrib' at drivers/scsi/csiostor/csio_lnode.c:248:2,
       inlined from 'csio_ln_fdmi_dprt_cbfn' at drivers/scsi/csiostor/csio_lnode.c:471:2:
>> include/linux/string.h:309:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
       __read_overflow2();
       ^~~~~~~~~~~~~~~~~~
   In function 'memcpy',
       inlined from 'csio_append_attrib' at drivers/scsi/csiostor/csio_lnode.c:248:2,
       inlined from 'csio_ln_fdmi_rhba_cbfn' at drivers/scsi/csiostor/csio_lnode.c:337:2:
>> include/linux/string.h:309:4: error: call to '__read_overflow2' declared with attribute error: detected read beyond size of object passed as 2nd parameter
       __read_overflow2();
       ^~~~~~~~~~~~~~~~~~

vim +/__read_overflow2 +309 include/linux/string.h

   303		size_t p_size = __builtin_object_size(p, 0);
   304		size_t q_size = __builtin_object_size(q, 0);
   305		if (__builtin_constant_p(size)) {
   306			if (p_size < size)
   307				__write_overflow();
   308			if (q_size < size)
 > 309				__read_overflow2();
   310		}
   311		if (p_size < size || q_size < size)
   312			fortify_panic(__func__);

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