[Bug binutils/29389] Failed assertions in bfd/cofflink.c and bfd/coff-x86_64.c during the linking stage (MSYS2 MinGW64)

[luca.bacci at outlook dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29389

--- Comment #7 from Luca Bacci <luca.bacci at outlook dot com> ---
Thanks, Alan!

I'm going to make a bundle containing all the required object files, will
attach it very soon.

Right now I have just tried debugging this issue in GDB a bit. What I could
find is that when the warning "local symbol `0' has no section" is output by
coff_classify_symbol (bfd *abfd, struct internal_syment *syment), syment points
to freed memory:

Thread 1 hit Breakpoint 1, coff_classify_symbol (abfd=0x1a32e152710,
syment=0x23121ff2f0) at ../../binutils-gdb/bfd/coffcode.h:5038
5038          _bfd_error_handler
(gdb) bt
#0  coff_classify_symbol (abfd=0x1a32e152710, syment=0x23121ff2f0)
    at ../../binutils-gdb/bfd/coffcode.h:5038
#1  0x00007ff6eda466a6 in _bfd_coff_link_input_bfd (flaginfo=0x23121ff700,
    input_bfd=0x1a32e152710) at ../../binutils-gdb/bfd/cofflink.c:1446
#2  0x00007ff6eda44ed8 in _bfd_coff_final_link (abfd=0x1a327bc62a0,
    info=0x7ff6edd07880 <link_info>) at ../../binutils-gdb/bfd/cofflink.c:868
#3  0x00007ff6ed9e41ed in ldwrite () at ../../binutils-gdb/ld/ldwrite.c:545
#4  0x00007ff6ed9e0b7b in main (argc=79, argv=0x1a326035890)
    at ../../binutils-gdb/ld/ldmain.c:513
(gdb) p *abfd
$1 = {filename = 0x1a32e13ac50 "libgobject_2_0_0_dll_d000431.o",
  xvec = 0x7ff6edbcf220 <x86_64_pe_vec>, iostream = 0x0,
  iovec = 0x7ff6edbb6280 <cache_iovec>, lru_prev = 0x0, lru_next = 0x0,
  where = 0, mtime = 0, id = 2121, flags = 32825, format = bfd_object,
  direction = read_direction, cacheable = 0, target_defaulted = 0,
  opened_once = 0, mtime_set = 0, no_export = 0, output_has_begun = 0,
  has_armap = 0, is_thin_archive = 0, no_element_cache = 0,
  selective_search = 0, is_linker_output = 0, is_linker_input = 1,
  plugin_format = bfd_plugin_unknown, lto_output = 0, lto_slim_object = 0,
  read_only = 0, plugin_dummy_bfd = 0x0, origin = 72736,
  proxy_origin = 72736, section_htab = {table = 0x1a32e1548a0,
    newfunc = 0x7ff6eda26cfe <bfd_section_hash_newfunc>,
    memory = 0x1a32d75c0d0, size = 4051, count = 5, entsize = 304,
    frozen = 0}, sections = 0x1a32e1538a8, section_last = 0x1a32e153d68,
  section_count = 5, archive_plugin_fd = -1,
  archive_plugin_fd_open_count = 0, archive_pass = 0, alloc_size = 6561,
  start_address = 0, outsymbols = 0x1a33339ae80, symcount = 8,
  dynsymcount = 0, arch_info = 0x7ff6edbe9040 <bfd_x86_64_arch>, size = 0,
  arelt_data = 0x1a32d75bfd0, my_archive = 0x1a32d75bd20, archive_next = 0x0,
  archive_head = 0x0, nested_archives = 0x0, link = {next = 0x1a32e12ff80,
    hash = 0x1a32e12ff80}, tdata = {aout_data = 0x1a32e13ac78,
    aout_ar_data = 0x1a32e13ac78, coff_obj_data = 0x1a32e13ac78,
    pe_obj_data = 0x1a32e13ac78, xcoff_obj_data = 0x1a32e13ac78,
    ecoff_obj_data = 0x1a32e13ac78, srec_data = 0x1a32e13ac78,
    verilog_data = 0x1a32e13ac78, ihex_data = 0x1a32e13ac78,
    tekhex_data = 0x1a32e13ac78, elf_obj_data = 0x1a32e13ac78,
    mmo_data = 0x1a32e13ac78, sun_core_data = 0x1a32e13ac78,
    sco5_core_data = 0x1a32e13ac78, trad_core_data = 0x1a32e13ac78,
    som_data = 0x1a32e13ac78, hpux_core_data = 0x1a32e13ac78,
    hppabsd_core_data = 0x1a32e13ac78, sgi_core_data = 0x1a32e13ac78,
    lynx_core_data = 0x1a32e13ac78, osf_core_data = 0x1a32e13ac78,
    cisco_core_data = 0x1a32e13ac78, versados_data = 0x1a32e13ac78,
    netbsd_core_data = 0x1a32e13ac78, mach_o_data = 0x1a32e13ac78,
    mach_o_fat_data = 0x1a32e13ac78, plugin_data = 0x1a32e13ac78,
    pef_data = 0x1a32e13ac78, pef_xlib_data = 0x1a32e13ac78,
    sym_data = 0x1a32e13ac78, any = 0x1a32e13ac78}, usrdata = 0x1a32e15ccf0,
  memory = 0x1a32d75bed0, build_id = 0x0}
(gdb) p *syment
$2 = {_n = {_n_name = "0\001\000\000\000\000\000", _n_n = {_n_zeroes = 304,
      _n_offset = 13451671603782742029}, _n_nptr = {
      0x130 <error: Cannot access memory at address 0x130>,
      0xbaadf00dbaadf00d <error: Cannot access memory at address
0xbaadf00dbaadf00d>}}, n_value = 1, n_scnum = 0, n_flags = 61453, n_type =
49200,
  n_sclass = 46 '.', n_numaux = 105 'i'}
(gdb)

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