Obtained 22 stack frames.
/usr/games/crawl-git-af110e8490(_Z17write_stack_traceP8_IO_FILE+0x3f) [0x5a4e43991f5f]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-af110e8490(_Z20crash_signal_handleri+0x196) [0x5a4e439923f6]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x7c30710dc330]: 
/usr/games/crawl-git-af110e8490(_Z12dgn_vault_at9coord_def+0x42) [0x5a4e43a57412]: dgn_vault_at(coord_def)
/usr/games/crawl-git-af110e8490(_Z23raw_feature_descriptionB5cxx11RK9coord_def+0x55) [0x5a4e43a373e5]: raw_feature_description[abi:cxx11](coord_def const&)
/usr/games/crawl-git-af110e8490(_Z13do_crash_dumpv+0x2237) [0x5a4e439a1fb7]: do_crash_dump()
/usr/games/crawl-git-af110e8490(_Z20crash_signal_handleri+0x1fa) [0x5a4e4399245a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x7c30710dc330]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11c) [0x7c3071135b2c]: 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x1e) [0x7c30710dc27e]: 
/usr/games/crawl-git-af110e8490(+0x55558d) [0x5a4e4399f58d]: 
/usr/games/crawl-git-af110e8490(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x5a4e4399fa97]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-git-af110e8490(_Z9save_gamebPKc+0x7c4) [0x5a4e43aac7c4]: save_game(bool, char const*)
/usr/games/crawl-git-af110e8490(_Z21check_selected_skillsv+0x257) [0x5a4e43f57e17]: check_selected_skills()
/usr/games/crawl-git-af110e8490(+0x660c15) [0x5a4e43aaac15]: 
/usr/games/crawl-git-af110e8490(_Z12restore_gameRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x23) [0x5a4e43aab743]: restore_game(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
/usr/games/crawl-git-af110e8490(_Z12startup_stepv+0x947) [0x5a4e43ff1f27]: startup_step()
/usr/games/crawl-git-af110e8490(+0xd338bd) [0x5a4e4417d8bd]: 
/usr/games/crawl-git-af110e8490(main+0x1f7) [0x5a4e438c3607]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x2a1ca) [0x7c30710c11ca]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x8b) [0x7c30710c128b]: 
/usr/games/crawl-git-af110e8490(_start+0x25) [0x5a4e438c40f5]: