[Bug tools/23247] Segfault in 0.171 RC1 release candidate

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=23247

--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Mark Wielaard from comment #1)
> While looking at this I also noticed that for this test file eu-readelf
> --debug-dump=ranges claims to find some unused garbage in .debug_ranges,
> which might indicate that we are either missing some attributes in the
> associated CU, or GCC really puts garbage in the .debug_ranges section
> (which would surprise me).

That is odd. It seems eu-readelf really is correct, there is unused garbage in
the .debug_ranges sections, but not generated by GCC, but by GNU AS:

DWARF section [28] '.debug_info' at offset 0xe3c0:
 [Offset]
 Compilation unit at offset 0:
 Version: 2, Abbreviation section offset: 0, Address size: 8, Offset size: 4
 [     b]  compile_unit         abbrev: 1
           stmt_list            (data4) 0
           ranges               (data4) range list [     0]
           name                 (strp) "../sysdeps/x86_64/crti.S"
           comp_dir             (strp)
"/home/abuild/rpmbuild/BUILD/glibc-2.27/csu"
           producer             (strp) "GNU AS 2.30.0"
           language             (data2) Mips_Assembler (32769)

[...]

 Compilation unit at offset 81846:
 Version: 2, Abbreviation section offset: 6828, Address size: 8, Offset size: 4
 [ 13fc1]  compile_unit         abbrev: 1
           stmt_list            (data4) 23645
           ranges               (data4) range list [  21a0]
           name                 (strp) "../sysdeps/x86_64/crtn.S"
           comp_dir             (strp)
"/home/abuild/rpmbuild/BUILD/glibc-2.27/csu"
           producer             (strp) "GNU AS 2.30.0"
           language             (data2) Mips_Assembler (32769)

DWARF section [33] '.debug_ranges' at offset 0x3e2b0:

 CU [     b] base: +000000000000000000 <ELFUTILS_0.170.90>
 [     0] base address
          +000000000000000000 <ELFUTILS_0.170.90>
 [    10]  <UNUSED GARBAGE> ... 48 bytes ...

[...]

 CU [ 13fc1] base: +000000000000000000 <ELFUTILS_0.170.90>
 [  21a0] base address
          +000000000000000000 <ELFUTILS_0.170.90>
 [  21b0]  <UNUSED GARBAGE IN REST OF SECTION>

All the other CU/ranges look fine. I assume that GNU AS is padding the section
for some reason. Anyway, this doesn't look like an eu-readelf bug.

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