[Bug default/27767] New: dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[Bug default/27767] New: dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27767

            Bug ID: 27767
           Summary: dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type
           Product: dwz
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: default
          Assignee: nobody at sourceware dot org
          Reporter: mliska at suse dot cz
                CC: dwz at sourceware dot org
  Target Milestone: ---

Happens for MozillaFirefox:

$ wget /srv/www/htdocs/splichaleu/tmp/libxul.so.debug.zst
$ zstd -d libxul.so.debug.zst
$ ./dwz -l 100000000 -L 1000000000 libxul.so.debug
/home/marxin/Programming/dwz/dwz: libxul.so.debug: Unknown DWARF
DW_OP_xderef_type

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[Bug default/27767] dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[lennordocdoc0921 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27767

Lennor <lennordocdoc0921 at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lennordocdoc0921 at gmail dot com

--- Comment #1 from Lennor <lennordocdoc0921 at gmail dot com> ---
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[Bug default/27767] dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27767

--- Comment #2 from Martin Liska <mliska at suse dot cz> ---
(In reply to Martin Liska from comment #0)
> Happens for MozillaFirefox:
> 
> $ wget /srv/www/htdocs/splichaleu/tmp/libxul.so.debug.zst

Should be:
$ wget https://splichal.eu/tmp/libxul.so.debug.zst

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[Bug default/27767] dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27767

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-01-13
                 CC|                            |mark at klomp dot org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
Confirmed, newer dwz does give a more information in the error message:
./dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type referenced from DIE at
[4ac96a5c]

dwz does indeed not handle DW_OP_xderef_type, which carries an extra address
space identifier. But I suspect this is corrupt DWARF, binutils readelf doesn't
like it:

readelf: ./libxul.so.debug: Warning: Bogus end-of-siblings marker detected at
offset 4ac96a6a in .debug_info section
readelf: ./libxul.so.debug: Warning: Bogus end-of-siblings marker detected at
offset 4ac96a6b in .debug_info section
readelf: ./libxul.so.debug: Warning: Bogus end-of-siblings marker detected at
offset 4ac96a6c in .debug_info section

Which is suspiciously close to to the identified DIE.

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[Bug default/27767] dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[mark at klomp dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27767

--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
This might be a bug in NASM because this is the bogus compile unit: 

 <0><4ac969e7>: Abbrev Number: 1 (DW_TAG_compile_unit)
    <4ac969e8>   DW_AT_low_pc      : 0x4b17c00
    <4ac969f0>   DW_AT_high_pc     : 0x4b1b9f7
    <4ac969f8>   DW_AT_stmt_list   : 0x621f999
    <4ac969fc>   DW_AT_name        :
/home/abuild/rpmbuild/BUILD/firefox-87.0/third_party/dav1d/src/x86/cdef_avx2.asm
    <4ac96a4d>   DW_AT_producer    : NASM 2.15.05
    <4ac96a5a>   DW_AT_language    : 32769      (MIPS assembler)
 <1><4ac96a5c>: Abbrev Number: 2 (DW_TAG_subprogram)
    <4ac96a5d>   DW_AT_low_pc      : 0x4b17c00
    <4ac96a65>   DW_AT_frame_base  : 0x0 (location list)
 <1><4ac96a69>: Abbrev Number: 0
 <0><4ac96a6a>: Abbrev Number: 0
readelf: ./libxul.so.debug: Warning: Bogus end-of-siblings marker detected at
offset 4ac96a6a in .debug_info section
readelf: ./libxul.so.debug: Warning: Further warnings about bogus
end-of-sibling markers suppressed
 <-1><4ac96a6b>: Abbrev Number: 0

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[Bug default/27767] dwz: libxul.so.debug: Unknown DWARF DW_OP_xderef_type

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27767

Martin Liska <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=27588

--- Comment #5 from Martin Liska <mliska at suse dot cz> ---
Oh, again a corrupted NASM debug info, so related to PR27588.

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