[Bug default/29829] New: abidiff coredump at abg-dwarf-reader.cc when read libxul.so

["hexiaole1994 at 126 dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29829

            Bug ID: 29829
           Summary: abidiff coredump at abg-dwarf-reader.cc when read
                    libxul.so
           Product: libabigail
           Version: unspecified
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: default
          Assignee: dodji at redhat dot com
          Reporter: hexiaole1994 at 126 dot com
                CC: libabigail at sourceware dot org
  Target Milestone: ---

[Overview]
Executing 'abidiff' against to centos7.6's 'libxul.so.debug' will cause
coredump, the output from 'bt' command of 'gdb' shows below:

/* command begin */
# abidiff libxul.so.debug libxul.so.debug
abidiff: abg-dwarf-reader.cc:14628: abigail::ir::function_type_sptr
abigail::dwarf_reader::build_function_type(abigail::dwarf_reader::read_context&,
Dwarf_Die*, abigail::ir::class_or_union_sptr, size_t): Assertion `__abg_cond__'
failed.
Aborted (core dumped)
# gdb -c core abidiff
(gdb) bt
#0  0x0000fffdcc4d63d0 in raise () from /usr/lib64/libc.so.6
#1  0x0000fffdcc4d777c in abort () from /usr/lib64/libc.so.6
#2  0x0000fffdcc4cf940 in ?? () from /usr/lib64/libc.so.6
#3  0x0000fffdcc4cf9bc in __assert_fail () from /usr/lib64/libc.so.6
#4  0x0000fffdccde5358 in abigail::dwarf_reader::build_function_type (ctxt=...,
die=die@entry=0xffffe5874a38, is_method=std::shared_ptr (empty) 0x0,
where_offset=137951670,
    where_offset@entry=187657105818480) at abg-dwarf-reader.cc:14628
#5  0x0000fffdccdda294 in abigail::dwarf_reader::build_ir_node_from_die
(ctxt=..., die=die@entry=0xffffe5874a38, scope=0xaaadc4f57760,
    called_from_public_decl=called_from_public_decl@entry=true,
where_offset=187657105818480, where_offset@entry=137951670,
is_declaration_only=false, is_declaration_only@entry=true,
    is_required_decl_spec=is_required_decl_spec@entry=false) at
abg-dwarf-reader.cc:16413
...
#140 abigail::dwarf_reader::read_debug_info_into_corpus (ctxt=...) at
abg-dwarf-reader.cc:15878
#141 0x0000fffdccdedb34 in abigail::dwarf_reader::read_corpus_from_elf
(ctxt=..., status=@0xffffe588a798: abigail::elf_reader::STATUS_UNKNOWN) at
abg-dwarf-reader.cc:17012
#142 0x0000aaabfac261cc in main (argc=<optimized out>, argv=0xffffe588ac48) at
abidiff.cc:1207
/* command end */

The two arguments of 'abidiff' are same thing, the centos7.6's
'libxul.so.debug'. The reason to executing 'abidiff' in this way is all for
reproducing problem in more clear way, expressing this problem is only caused
by reading dwarf from centos7.6's 'libxul.so.debug'.

[Steps to Reproduce]
(1)download 'thunderbird' binary rpm that contains 'libxul.so.debug' from
centos7.6 website:
http://debuginfo.centos.org/7/x86_64/thunderbird-debuginfo-52.9.1-1.el7.centos.x86_64.rpm
(2)unpack 'thunderbird' binary rpm to get the 'libxul.so.debug'
rpm2cpio thunderbird-debuginfo-52.9.1-1.el7.centos.x86_64.rpm | cpio -idum
(3)create symbolic link to 'libxul.so.debug' for handy access:
ln -s usr/lib/debug/usr/lib64/thunderbird/libxul.so.debug .
(4)executing 'abidiff' to reproducing problem:
abidiff libxul.so.debug libxul.so.debug

[Actual Results]
'abidiff' crashes with coredump:

/* crash output begin */
abidiff: abg-dwarf-reader.cc:14628: abigail::ir::function_type_sptr
abigail::dwarf_reader::build_function_type(abigail::dwarf_reader::read_context&,
Dwarf_Die*, abigail::ir::class_or_union_sptr, size_t): Assertion `__abg_cond__'
failed.
Aborted (core dumped)
/* crash output end */

[Expected Results]
'abidiff' finishes normally without any message, because the 2 compared dynamic
libraries are same.

[Additional Information]
the libabigail version that reproduding against:
git repo: git://sourceware.org/git/libabigail.git
branch: master
HEAD commit: 7bd69830520f2e7ce4efb989b5fd23fde316c7c1(Make Front Ends first
class citizens)

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