[Bug ld/12845] New: ld segfaults when using

[aurelien at aurel32 dot net]

http://sourceware.org/bugzilla/show_bug.cgi?id=12845

           Summary: ld segfaults when using
           Product: binutils
           Version: 2.22 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
        AssignedTo: address@hidden
        ReportedBy: address@hidden
              Host: mips-unknown-linux-gnu
            Target: mips-unknown-linux-gnu
             Build: mips-unknown-linux-gnu


When linking udev on mips, ld segfaults if --gc-sections is used (which is the
default in the recent versions). Here is the corresponding backtrace, it seems 
osec->used_by_bfd equals to NULL, so the segfaults appear when dereferencing
osec->used_by_bfd->this_hdr.sh_type.

This happens with binutils from HEAD.

(gdb) bt
#0  0x00481840 in _bfd_elf_init_private_section_data (ibfd=<value optimized
out>, isec=0x806d10, obfd=0x5da970, osec=0x5c4db8, link_info=0x5cb658)
    at elf.c:6279
#1  0x00411588 in lang_add_section (ptr=0x7fd410f8, section=0x806d10,
output=0x5cc580) at ldlang.c:2360
#2  0x0042b534 in mips_add_stub_section (stub_sec_name=0x79a638 ".text.stub.1",
input_section=0x778448, output_section=0x5c4db8) at eelf32btsmip.c:263
#3  0x00463a98 in mips_elf_add_la25_intro (h=<value optimized out>,
data=0x7fd411e0) at elfxx-mips.c:1599
#4  mips_elf_add_la25_stub (h=<value optimized out>, data=0x7fd411e0) at
elfxx-mips.c:1710
#5  mips_elf_check_symbols (h=<value optimized out>, data=0x7fd411e0) at
elfxx-mips.c:1740
#6  0x0044cbf0 in bfd_hash_traverse (table=0x5dcb98, func=0x463694
<mips_elf_check_symbols>, info=0x7fd411e0) at hash.c:656
#7  0x0046a084 in _bfd_mips_elf_always_size_sections (output_bfd=0x5da970,
info=0x5cb658) at elfxx-mips.c:8428
#8  0x0049718c in bfd_elf_size_dynamic_sections (output_bfd=0x5da970,
soname=0x0, rpath=0x0, filter_shlib=0x0, audit=0x0, depaudit=0x0,
    auxiliary_filters=0x0, info=0x5cb658, sinterpptr=0x7fd41318, verdefs=0x0)
at elflink.c:5598
#9  0x0042b828 in gldelf32btsmip_before_allocation () at eelf32btsmip.c:1598
#10 mips_before_allocation () at eelf32btsmip.c:299
#11 0x00416670 in lang_process () at ldlang.c:6653
#12 0x00402e34 in main (argc=21, argv=0x7fd41534) at ./ldmain.c:462
(gdb) print osec->used_by_bfd
$1 = (void *) 0x0

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