>>> bt
#0  0x00007f2810cdc08a in raise () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libc.so.6
#1  0x00007f2810cc6528 in abort () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libc.so.6
#2  0x000000000041b64c in handle_sigsegv(int) [clone .cold] ()
#3  <signal handler called>
#4  0x00007f2810dfd32f in __memmove_avx_unaligned_erms () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libc.so.6
#5  0x00007f2810fbdad5 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_mutate(unsigned long, unsigned long, char const*, unsigned long) () from /nix/store/vran8acwir59772hj4vscr7zribvp7l5-gcc-9.3.0-lib/lib/libstdc++.so.6
#6  0x00007f2810fbf0bb in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_append(char const*, unsigned long) () from /nix/store/vran8acwir59772hj4vscr7zribvp7l5-gcc-9.3.0-lib/lib/libstdc++.so.6
#7  0x00000000008600e3 in fputs_maybe_filtered(char const*, ui_file*, int) ()
#8  0x00000000008622c5 in vfprintf_styled_no_gdbfmt(ui_file*, ui_file_style const&, bool, char const*, __va_list_tag*) ()
#9  0x0000000000859723 in ui_out::call_do_message(ui_file_style const&, char const*, ...) ()
#10 0x0000000000859eec in ui_out::vmessage(ui_file_style const&, char const*, __va_list_tag*) ()
#11 0x000000000086036a in vfprintf_maybe_filtered(ui_file*, char const*, __va_list_tag*, bool, bool) ()
#12 0x0000000000860808 in printf_filtered(char const*, ...) ()
#13 0x000000000060d958 in inf_ptrace_target::files_info() ()
#14 0x0000000000610b4e in info_program_command(char const*, int) ()
#15 0x00000000004f7b8a in cmd_func(cmd_list_element*, char const*, int) ()
#16 0x0000000000833933 in execute_command(char const*, int) ()
#17 0x00000000004ffadb in execute_control_command_1(command_line*, int) ()
#18 0x00000000004ffeca in execute_control_commands(command_line*, int) ()
#19 0x000000000050002e in execute_control_commands_to_string[abi:cxx11](command_line*, int) ()
#20 0x0000000000733052 in execute_gdb_command(_object*, _object*, _object*) ()
#21 0x00007f28116c9e07 in PyCFunction_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#22 0x00007f28116c90c3 in _PyObject_MakeTpCall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#23 0x00007f28117370a7 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#24 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#25 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#26 0x00007f2811731541 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#27 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#28 0x00007f28116cb9e4 in method_vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#29 0x00007f2811733211 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#30 0x00007f2811731541 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#31 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#32 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#33 0x00007f2811731937 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#34 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#35 0x00007f28116ca450 in PyVectorcall_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#36 0x00007f281173416b in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#37 0x00007f2811731937 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#38 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#39 0x00007f28116cb9e4 in method_vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#40 0x00007f2811733211 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#41 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#42 0x00007f28116ca450 in PyVectorcall_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#43 0x00007f281173416b in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#44 0x00007f2811731937 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#45 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#46 0x00007f28116cb9e4 in method_vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#47 0x00007f2811736a43 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#48 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#49 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#50 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#51 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#52 0x00007f2811731937 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#53 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#54 0x00007f28116ca450 in PyVectorcall_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#55 0x00007f281173416b in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#56 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#57 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#58 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#59 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#60 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#61 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#62 0x00007f28116c8bca in _PyObject_FastCallDict () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#63 0x00007f28116ca0c5 in _PyObject_Call_Prepend () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#64 0x00007f281178f409 in slot_tp_call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#65 0x00007f28116c8fe7 in _PyObject_MakeTpCall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#66 0x00007f2811736b69 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#67 0x00007f28116c8bca in _PyObject_FastCallDict () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#68 0x00007f28116ca0c5 in _PyObject_Call_Prepend () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#69 0x00007f281178f409 in slot_tp_call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#70 0x00007f28116c8fe7 in _PyObject_MakeTpCall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#71 0x00007f2811736b69 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#72 0x00007f2811731af2 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#73 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#74 0x00007f28117324f3 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#75 0x00007f2811731af2 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#76 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#77 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#78 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#79 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#80 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#81 0x00007f2811736a43 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#82 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#83 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#84 0x00007f28116c8bca in _PyObject_FastCallDict () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#85 0x00007f28116ca0c5 in _PyObject_Call_Prepend () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#86 0x00007f2811704793 in slot_tp_init () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#87 0x00007f28117023ad in type_call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#88 0x00007f28116c8fe7 in _PyObject_MakeTpCall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#89 0x00007f2811736e1f in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#90 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#91 0x00007f28116cbbdb in method_vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#92 0x00007f28116ca450 in PyVectorcall_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#93 0x00007f281173416b in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#94 0x00007f2811731937 in _PyEval_EvalCodeWithName () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#95 0x00007f28116c987e in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#96 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#97 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#98 0x00007f28116cbbdb in method_vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#99 0x00007f28116ca450 in PyVectorcall_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#100 0x00007f281173416b in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#101 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#102 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#103 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#104 0x00007f28117328e8 in _PyEval_EvalFrameDefault () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#105 0x00007f28116c97ea in _PyFunction_Vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#106 0x00007f28116cbbdb in method_vectorcall () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#107 0x00007f28116ca450 in PyVectorcall_Call () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#108 0x00007f28117d7caa in t_bootstrap () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#109 0x00007f28117bce24 in pythread_wrapper () from /nix/store/z65l1jqvxa58zzwwa3bvglb6asj4y8cv-python3-3.8.5/lib/libpython3.8.so.1.0
#110 0x00007f2811583ead in start_thread () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libpthread.so.0
#111 0x00007f2810d9bd2f in clone () from /nix/store/9df65igwjmf2wbw0gbrrgair6piqjgmi-glibc-2.31/lib/libc.so.6