[Bug ld/18160] New: Segmentation Fault in lang_gc_sections when linking elf_x86_64 output

[matthew.ickstadt at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18160

            Bug ID: 18160
           Summary: Segmentation Fault in lang_gc_sections when linking
                    elf_x86_64 output
           Product: binutils
           Version: 2.26 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: matthew.ickstadt at gmail dot com

OS: Linux 3.16.0 x86_64 Ubuntu 14.10

Confirmed issue with HEAD (a25d8bf9c5b2c9d3671f4508c9132485c65c3773) and with
2.24.90

Linking together a few NASM-assembled objects and a rust-compiled lib with the
command:

ld-new --gc-sections -m elf_x86_64 -T link.ld -o bin/kernel.elf
arch/x86_64/asm/multiboot.o arch/x86_64/asm/idt.o arch/x86_64/asm/runtime.o
arch/x86_64/asm/gdt.o bin/libkernel.a

It links fine with -m elf_i386 and only crashes for elf_x86_64.

Here's a backtrace:

#0  0x0000000000482fb5 in elf_i386_gc_sweep_hook (abfd=0x1391750, info=0x7befc0
<link_info>,
    sec=0x13b6a98, relocs=<optimized out>) at elf32-i386.c:1958
#1  0x0000000000472cae in elf_gc_sweep (info=0x7befc0 <link_info>,
abfd=0x136de20) at elflink.c:12210
#2  bfd_elf_gc_sections (abfd=0x136de20, info=0x7befc0 <link_info>) at
elflink.c:12472
#3  0x00000000004147df in lang_gc_sections () at ldlang.c:6408
#4  lang_process () at ldlang.c:6727
#5  0x00000000004039e7 in main (argc=13, argv=0x7fff8eebea98) at ./ldmain.c:418

It's interesting that it's still using elf_i386 functions for a 64-bit binary,
but that could be normal for all I know.

I can attach objects/source/core if needed.

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