https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114872
--- Comment #8 from Sam James <sjames at gcc dot gnu.org> --- element.i is unfortunatley huge. It's hard to analyse things without a standalone testcase, but it's even harder without _something_ one can run. I'd suggest: 1) giving instructions to reproduce the crash assuming someone knows nothing about sage and cython; 2) taking sage and cannibalising it (first to directly call `libgap.AbelianGroup(0,0,0)`, then you can cut things down with lots of removals + gdb so that the important caller of Py_XDECREF gets passed with the same args; it's harder if there's a lot of state involved though, of course) 3) build element.i with -fdump-tree-all -fdump-unnumbered -fdump-noaddr (can also try e.g. -da, see https://gcc.gnu.org/onlinedocs/gcc/Developer-Options.html) at the bad commit and before, and diff the produced dumps, and show us the *first* dump which differs between the two
