Obtained 22 stack frames.
/usr/games/crawl-git-a3dc3e11f2(_Z17write_stack_traceP8_IO_FILE+0x3f) [0x5da74972649f]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-a3dc3e11f2(_Z20crash_signal_handleri+0x196) [0x5da749726936]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7cc732a42910]: 
/usr/games/crawl-git-a3dc3e11f2(_Z12dgn_vault_at9coord_def+0x42) [0x5da7497ec4a2]: dgn_vault_at(coord_def)
/usr/games/crawl-git-a3dc3e11f2(_Z23raw_feature_descriptionB5cxx11RK9coord_def+0x55) [0x5da7497cc495]: raw_feature_description[abi:cxx11](coord_def const&)
/usr/games/crawl-git-a3dc3e11f2(_Z13do_crash_dumpv+0x2237) [0x5da749736527]: do_crash_dump()
/usr/games/crawl-git-a3dc3e11f2(_Z20crash_signal_handleri+0x1fa) [0x5da74972699a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7cc732a42910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x7cc732a9999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x7cc732a42866]: 
/usr/games/crawl-git-a3dc3e11f2(+0x562afd) [0x5da749733afd]: 
/usr/games/crawl-git-a3dc3e11f2(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x5da749734007]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-git-a3dc3e11f2(_Z9save_gamebPKc+0x7c4) [0x5da7498420c4]: save_game(bool, char const*)
/usr/games/crawl-git-a3dc3e11f2(_Z21check_selected_skillsv+0x257) [0x5da749cf31f7]: check_selected_skills()
/usr/games/crawl-git-a3dc3e11f2(+0x66f515) [0x5da749840515]: 
/usr/games/crawl-git-a3dc3e11f2(_Z12restore_gameRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x23) [0x5da749841043]: restore_game(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
/usr/games/crawl-git-a3dc3e11f2(_Z12startup_stepv+0x947) [0x5da749d906d7]: startup_step()
/usr/games/crawl-git-a3dc3e11f2(+0xd4fffd) [0x5da749f20ffd]: 
/usr/games/crawl-git-a3dc3e11f2(main+0x1f7) [0x5da7496549a7]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7cc732a280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7cc732a28189]: 
/usr/games/crawl-git-a3dc3e11f2(_start+0x25) [0x5da749655495]: