Obtained 25 stack frames.
/usr/games/crawl-git-5d7b2d6c54(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x639f40f3d15e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-5d7b2d6c54(_Z20crash_signal_handleri+0x18f) [0x639f40f3d5cf]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x7f101a9c0330]: 
/usr/games/crawl-git-5d7b2d6c54(+0xcdf05f) [0x639f4172805f]: 
/usr/games/crawl-git-5d7b2d6c54(lua_gettable+0x5c) [0x639f4171949c]: 
/usr/games/crawl-git-5d7b2d6c54(_ZNK14map_lua_marker15debug_to_stringB5cxx11Ev+0x57) [0x639f4126b307]: map_lua_marker::debug_to_string[abi:cxx11]() const
/usr/games/crawl-git-5d7b2d6c54(_Z13do_crash_dumpv+0x1d84) [0x639f40f4cce4]: do_crash_dump()
/usr/games/crawl-git-5d7b2d6c54(_Z20crash_signal_handleri+0x1fa) [0x639f40f3d63a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x7f101a9c0330]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11c) [0x7f101aa19b2c]: 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x1e) [0x7f101a9c027e]: 
/lib/x86_64-linux-gnu/libc.so.6(abort+0xdf) [0x7f101a9a38ff]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x297b6) [0x7f101a9a47b6]: 
/lib/x86_64-linux-gnu/libc.so.6(+0xa8ff5) [0x7f101aa23ff5]: 
/lib/x86_64-linux-gnu/libc.so.6(+0xab12c) [0x7f101aa2612c]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_free+0x7e) [0x7f101aa28dae]: 
/usr/games/crawl-git-5d7b2d6c54(+0xce73d1) [0x639f417303d1]: 
/usr/games/crawl-git-5d7b2d6c54(+0xcd8a29) [0x639f41721a29]: 
/usr/games/crawl-git-5d7b2d6c54(+0xcddebd) [0x639f41726ebd]: 
/usr/games/crawl-git-5d7b2d6c54(_ZN4CLua5closeEv+0xbe) [0x639f40f2435e]: CLua::close()
/usr/games/crawl-git-5d7b2d6c54(+0x2f4afc) [0x639f40d3dafc]: 
/usr/games/crawl-git-5d7b2d6c54(+0x2f7ac8) [0x639f40d40ac8]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x2a1ca) [0x7f101a9a51ca]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x8b) [0x7f101a9a528b]: 
/usr/games/crawl-git-5d7b2d6c54(_start+0x25) [0x639f40e6f7a5]: