Obtained 22 stack frames.
/usr/games/crawl-0.34(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x60694198ae0e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x18f) [0x60694198b27f]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x79dc96aef330]: 
/usr/games/crawl-0.34(_Z12dgn_vault_at9coord_def+0x42) [0x606941a4bca2]: dgn_vault_at(coord_def)
/usr/games/crawl-0.34(_Z23raw_feature_descriptionB5cxx11RK9coord_def+0x5c) [0x606941a2c61c]: raw_feature_description[abi:cxx11](coord_def const&)
/usr/games/crawl-0.34(_Z13do_crash_dumpv+0x227a) [0x60694199aeaa]: do_crash_dump()
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x1fa) [0x60694198b2ea]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x79dc96aef330]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11c) [0x79dc96b48b2c]: 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x1e) [0x79dc96aef27e]: 
/usr/games/crawl-0.34(+0x50343d) [0x60694199843d]: 
/usr/games/crawl-0.34(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x606941998947]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-0.34(_Z9save_gamebPKc+0x7c4) [0x606941a9f5d4]: save_game(bool, char const*)
/usr/games/crawl-0.34(_Z21check_selected_skillsv+0x257) [0x606941f3d187]: check_selected_skills()
/usr/games/crawl-0.34(+0x608afc) [0x606941a9dafc]: 
/usr/games/crawl-0.34(_Z12restore_gameRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x23) [0x606941a9e553]: restore_game(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
/usr/games/crawl-0.34(_Z12startup_stepv+0x947) [0x606941fd4167]: startup_step()
/usr/games/crawl-0.34(+0xcc3aed) [0x606942158aed]: 
/usr/games/crawl-0.34(main+0x1f7) [0x6069418bc907]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x2a1ca) [0x79dc96ad41ca]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x8b) [0x79dc96ad428b]: 
/usr/games/crawl-0.34(_start+0x25) [0x6069418bd3f5]: