[Bug default/26315] abidiff segfaults from 9a113ce but works in 1.7

[sourceware at sgoth dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=26315

--- Comment #6 from Sebastian Goth <sourceware at sgoth dot de> ---
Hey. Sorry for the late reply but vacation happened.

Sadly i can't attach the binary here but I'd be happy to help debug it. My
attempts to create a test case failed so far..

A bit more info:

- still happens in current master ( ebaf3305 )
- is unrelated to any actual change, comparing the same bins/includes crashes
- only crashes if called with '--drop-private-types'


$ ./bin/abidiff /path/to/lib.so /path/to/lib.so --hd1 /path/to/hdr --hd2
/path/to/hdr
$ ./bin/abidiff --drop-private-types /path/to/lib.so /path/to/lib.so --hd1
/path/to/hdr --hd2 /path/to/hdr
Segmentation fault (core dumped)

at same location:

#0  abigail::ir::equals (l=..., r=..., k=0x0) at ../../src/abg-ir.cc:15819
#1  0x00007ffff7c456d9 in
abigail::ir::try_canonical_compare<abigail::ir::typedef_decl>
(l=0x555557a18710, r=0x555555e1d8b0) at ../../src/abg-ir.cc:670
#2  0x00007ffff7c0efc6 in abigail::ir::typedef_decl::operator==
(this=0x555557a18710, o=...) at ../../src/abg-ir.cc:15842
#3  0x00007ffff7c0f041 in abigail::ir::typedef_decl::operator==
(this=0x555557a18710, o=...) at ../../src/abg-ir.cc:15857
#4  0x00007ffff7be9204 in abigail::ir::operator==
(l=std::shared_ptr<abigail::ir::type_base> (use count 4, weak count 11) =
{...}, r=std::shared_ptr<abigail::ir::type_base> (use count 9, weak count 10) =
{...}) at ../../src/abg-ir.cc:4322
#5  0x00007ffff7c0114c in abigail::ir::type_base::get_canonical_type_for
(t=std::shared_ptr<abigail::ir::type_base> (use count 9, weak count 10) =
{...}) at ../../src/abg-ir.cc:12178
#6  0x00007ffff7c01808 in abigail::ir::canonicalize
(t=std::shared_ptr<abigail::ir::type_base> (use count 9, weak count 10) =
{...}) at ../../src/abg-ir.cc:12301
#7  0x00007ffff7dfa1b1 in
abigail::dwarf_reader::read_context::canonicalize_types_scheduled
(this=0x555565bc2f50,
source=abigail::dwarf_reader::PRIMARY_DEBUG_INFO_DIE_SOURCE) at
../../src/abg-dwarf-reader.cc:4833
#8  0x00007ffff7dfa9b6 in
abigail::dwarf_reader::read_context::perform_late_type_canonicalizing
(this=0x555565bc2f50) at ../../src/abg-dwarf-reader.cc:4949
#9  0x00007ffff7deb4c7 in abigail::dwarf_reader::read_debug_info_into_corpus
(ctxt=...) at ../../src/abg-dwarf-reader.cc:16024
#10 0x00007ffff7df00f6 in abigail::dwarf_reader::read_corpus_from_elf
(ctxt=..., status=@0x7fffffffd05c: abigail::dwarf_reader::STATUS_UNKNOWN) at
../../src/abg-dwarf-reader.cc:17149
#11 0x0000555555559c15 in main (argc=<optimized out>, argv=0x7fffffffd488) at
/usr/include/c++/10.2.0/bits/shared_ptr_base.h:1324

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