[Bug default/26782] abidiff crashes in abigail::diff_utils::deep_ptr_eq_functor::operator()<abigail::ir::var_decl> () when comparing a library to itself

["woodard at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26782

--- Comment #3 from Ben Woodard <woodard at redhat dot com> ---
The problem still seems to exist as of commit
2cc1ab7ee879da20688c4a72ec93c73123d7b9aa 

Here is an up to date backtrace for one example from
dbusmenu-qt-0.9.3-0.25.20160218.fc33.x86_64 it looks a little bit different
than the previous versions but it crashes in the same place

$ cat libdbusmenu-qt.so.2.6.0.bt
Reading symbols from abidw...
Starting program: /home/ben/Scratch/Work/test/libabigail-x86_64/bin/abidw
--abidiff /lib64/libdbusmenu-qt.so.2.6.0
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7e2ba17 in
abigail::diff_utils::deep_ptr_eq_functor::operator()<abigail::ir::var_decl>
(this=<optimized out>, second=<optimized out>, first=<optimized out>) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:772
772         return *first == *second;
#0  0x00007ffff7e2ba17 in
abigail::diff_utils::deep_ptr_eq_functor::operator()<abigail::ir::var_decl>
(this=<optimized out>, second=<optimized out>, first=<optimized out>) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:772
#1  abigail::diff_utils::deep_ptr_eq_functor::operator()<abigail::ir::var_decl>
(this=<synthetic pointer>, second=0x473cb90, first=0x1d38360) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:763
#2 
abigail::diff_utils::end_of_fr_d_path_in_k<__gnu_cxx::__normal_iterator<abigail::ir::var_decl*
const*, std::vector<abigail::ir::var_decl*,
std::allocator<abigail::ir::var_decl*> > >,
abigail::diff_utils::deep_ptr_eq_functor> (k=k@entry=0, d=d@entry=0,
a_begin=..., a_begin@entry=0x1d38360, a_end=..., a_end@entry=0x1bbb100,
b_start=b_start@entry=0x473cb90, b_end=..., b_end@entry=0x4943400, v=...,
snak=...) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:912
#3  0x00007ffff7e2c153 in
abigail::diff_utils::compute_middle_snake<__gnu_cxx::__normal_iterator<abigail::ir::var_decl*
const*, std::vector<abigail::ir::var_decl*,
std::allocator<abigail::ir::var_decl*> > >,
abigail::diff_utils::deep_ptr_eq_functor> (a_begin=a_begin@entry=0x1d38360,
a_end=..., a_end@entry=0x1bbb100, b_begin=..., b_begin@entry=0x473cb90,
b_end=..., b_end@entry=0x4943400, snak=...,
ses_len=ses_len@entry=@0x7fffffffd8dc: 0) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:1201
#4  0x00007ffff7e46adb in
abigail::diff_utils::compute_diff<__gnu_cxx::__normal_iterator<abigail::ir::var_decl*
const*, std::vector<abigail::ir::var_decl*,
std::allocator<abigail::ir::var_decl*> > >,
abigail::diff_utils::deep_ptr_eq_functor> (a_base=..., a_begin=0x1d38360,
a_end=a_end@entry=0x1bbb100, b_base=..., b_base@entry=0x473cb90, b_begin=...,
b_begin@entry=0x473cb90, b_end=b_end@entry=0x4943400, lcs=std::vector of length
0, capacity 0, ses=..., ses_len=@0x7fffffffda60: 0) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:1543
#5  0x00007ffff7e1133d in
abigail::diff_utils::compute_diff<__gnu_cxx::__normal_iterator<abigail::ir::var_decl*
const*, std::vector<abigail::ir::var_decl*,
std::allocator<abigail::ir::var_decl*> > >,
abigail::diff_utils::deep_ptr_eq_functor> (ses=..., lcs=std::vector of length
0, capacity 0, b_end=..., b_begin=..., b_base=..., a_end=..., a_begin=...,
a_base=...) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:1778
#6 
abigail::diff_utils::compute_diff<__gnu_cxx::__normal_iterator<abigail::ir::var_decl*
const*, std::vector<abigail::ir::var_decl*,
std::allocator<abigail::ir::var_decl*> > >,
abigail::diff_utils::deep_ptr_eq_functor> (ses=..., b_end=0x4943400,
b_begin=0x473cb90, b_base=0x473cb90, a_end=0x1bbb100, a_begin=..., a_base=...)
at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:1934
#7 
abigail::diff_utils::compute_diff<__gnu_cxx::__normal_iterator<abigail::ir::var_decl*
const*, std::vector<abigail::ir::var_decl*,
std::allocator<abigail::ir::var_decl*> > >,
abigail::diff_utils::deep_ptr_eq_functor> (ses=..., b_end=0x4943400,
b_begin=0x473cb90, a_end=0x1bbb100, a_begin=...) at
/home/ben/Scratch/Work/build/libabigail-x86_64/../../libabigail/include/abg-diff-utils.h:1981
#8  abigail::comparison::compute_diff (f=std::shared_ptr<abigail::ir::corpus>
(use count 3, weak count 0) = {...}, s=std::shared_ptr<abigail::ir::corpus>
(use count 3, weak count 0) = {...},
ctxt=std::shared_ptr<abigail::comparison::diff_context> (use count 2, weak
count 1) = {...}) at ../../../libabigail/src/abg-comparison.cc:11084
#9  0x0000000000406443 in load_corpus_and_write_abixml (opts=...,
context=std::shared_ptr<abigail::dwarf_reader::read_context> (empty) = {...},
env=std::shared_ptr<abigail::ir::environment> (use count 1, weak count 0) =
{...}, argv=0x7fffffffe068) at ../../../libabigail/tools/abidw.cc:590
#10 main (argc=<optimized out>, argv=0x7fffffffe068) at
../../../libabigail/tools/abidw.cc:866

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