Obtained 20 stack frames.
/usr/games/crawl-0.33(_Z17write_stack_traceP8_IO_FILE+0x3f) [0x55c102f7bf8f]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-0.33(_Z20crash_signal_handleri+0x18f) [0x55c102f7c3af]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7f8cd17cf210]: 
/usr/games/crawl-0.33(_Z12dgn_vault_at9coord_def+0x42) [0x55c103033402]: dgn_vault_at(coord_def)
/usr/games/crawl-0.33(_Z23raw_feature_descriptionB5cxx11RK9coord_def+0x5e) [0x55c1030146de]: raw_feature_description[abi:cxx11](coord_def const&)
/usr/games/crawl-0.33(_Z13do_crash_dumpv+0x1fef) [0x55c102f880bf]: do_crash_dump()
/usr/games/crawl-0.33(_Z20crash_signal_handleri+0x1fa) [0x55c102f7c41a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x46210) [0x7f8cd17cf210]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xcb) [0x7f8cd199024b]: 
/usr/games/crawl-0.33(+0x4e5c2d) [0x55c102f85c2d]: 
/usr/games/crawl-0.33(+0x4e5de5) [0x55c102f85de5]: 
/usr/games/crawl-0.33(_Z9save_gamebPKc+0x967) [0x55c10307b397]: save_game(bool, char const*)
/usr/games/crawl-0.33(_Z21check_selected_skillsv+0x260) [0x55c1034cf740]: check_selected_skills()
/usr/games/crawl-0.33(+0x5d92f4) [0x55c1030792f4]: 
/usr/games/crawl-0.33(_Z12restore_gameRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x21) [0x55c103079b51]: restore_game(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
/usr/games/crawl-0.33(_Z12startup_stepv+0x1501) [0x55c10355c9b1]: startup_step()
/usr/games/crawl-0.33(+0xc1ef1f) [0x55c1036bef1f]: 
/usr/games/crawl-0.33(main+0x1ab) [0x55c102ebeefb]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0x7f8cd17b00b3]: 
/usr/games/crawl-0.33(_start+0x2e) [0x55c102ebfaee]: