Hello! It seems that gdb from base NetBSD image doesn't work with netbsd's libcurses in tui mode:
Program terminated with signal SIGSEGV, Segmentation fault. #0 0x0000756547929fba in _lwp_kill () from /usr/lib/libc.so.12 [Current thread is 1 (process 12621)] (gdb) bt #0 0x0000756547929fba in _lwp_kill () from /usr/lib/libc.so.12 #1 0x000000000101ef97 in handle_fatal_signal(int) () #2 0x000000000101f152 in handle_sigsegv(int) () #3 <signal handler called> #4 0x0000756547e679e1 in prefresh () from /usr/lib/libcurses.so.9 #5 0x0000000000eec1a0 in tui_source_window_base::refresh_window() () #6 0x0000000000eedf18 in tui_unhighlight_win(tui_win_info*) () #7 0x0000000000eec5f8 in tui_source_window_base::do_erase_source_content(char const*) () #8 0x0000000000ef60e5 in tui_layout_split::apply(int, int, int, int, bool) () #9 0x0000000000ef4aa8 in tui_apply_current_layout(bool) () #10 0x0000000000ef4ddb in tui_set_layout(tui_layout_split*) () #11 0x0000000000ee4f2f in tui_enable() () #12 0x0000000000ee5487 in tui_rl_switch_mode(int, int) () #13 0x0000000001379fa8 in _rl_dispatch_subseq () #14 0x000000000137aa27 in _rl_dispatch_callback () #15 0x000000000135a1f1 in rl_callback_read_char () #16 0x000000000101f40e in gdb_rl_callback_read_char_wrapper_noexcept() () #17 0x000000000102020d in gdb_rl_callback_read_char_wrapper(void*) () #18 0x000000000101eeb1 in stdin_event_handler(int, void*) () #19 0x0000000001300eba in gdb_wait_for_event(int) [clone .part.0] () #20 0x000000000130155a in gdb_do_one_event(int) () #21 0x0000000000fa0576 in captured_command_loop() () #22 0x0000000000fa2113 in gdb_main(captured_main_args*) () #23 0x00000000013c66fb in main ()