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Reproducible with libabigail-1.8.2-1.el9 and currentl upstream version libabigail/b215a2115376225b04b4d6b25acc6c5a1b4021e9:

2021-04-19 00:14:37.151050 Running '/mnt/tests/tools/libabigail/Sanity/selfcheck/fedabipkgdiff --abipkgdiff /usr/bin/abipkgdiff --server https://brewhub.engineering.redhat.com/brewhub --topurl http://download.devel.redhat.com/brewroot --self-compare -a --from el9 zip'
2021-04-19 00:14:39.267222 Error encountered while running fedabipkgdiff with error message: 
 abipkgdiff: abg-ir.cc:23443: size_t abigail::ir::hash_as_canonical_type_or_constant(const abigail::ir::type_base*): Assertion `__abg_cond__' failed.

This should now be fixed by upstream commit https://sourceware.org/git/?p=libabigail.git;a=commit;h=7488c8df3bf10750ce059a0ec1d44d8149149c86.

It should be available in 2.0.

Tested with 7060a0b upstream commit

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.