Obtained 20 stack frames.
/usr/games/crawl-git-cac7fed025(_Z17write_stack_traceP8_IO_FILEi+0x23) [0x63e463]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-git-cac7fed025(_Z20crash_signal_handleri+0x174) [0x63e7d4]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x324f0) [0x7f7a2694c4f0]: 
/usr/games/crawl-git-cac7fed025(_ZNKSt8_Rb_treeI20dungeon_feature_typeSt4pairIKS0_SsESt10_Select1stIS3_ESt4lessIS0_ESaIS3_EE4findERS2_+0x24) [0x6ab804]: std::_Rb_tree<dungeon_feature_type, std::pair<dungeon_feature_type const, std::string>, std::_Select1st<std::pair<dungeon_feature_type const, std::string> >, std::less<dungeon_feature_type>, std::allocator<std::pair<dungeon_feature_type const, std::string> > >::find(dungeon_feature_type const&) const
/usr/games/crawl-git-cac7fed025(_Z23raw_feature_descriptionRK9coord_def+0x7c) [0x6a19ec]: raw_feature_description(coord_def const&)
/usr/games/crawl-git-cac7fed025(_Z13do_crash_dumpv+0xdf8) [0x646008]: do_crash_dump()
/usr/games/crawl-git-cac7fed025(_Z20crash_signal_handleri+0x74) [0x63e6d4]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x324f0) [0x7f7a2694c4f0]: 
/lib/x86_64-linux-gnu/libc.so.6(__write+0x10) [0x7f7a269e8af0]: 
/lib/x86_64-linux-gnu/libc.so.6(_IO_file_write+0x43) [0x7f7a2698ce53]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x72aca) [0x7f7a2698caca]: 
/lib/x86_64-linux-gnu/libc.so.6(_IO_file_xsputn+0x1fe) [0x7f7a2698cdbe]: 
/lib/x86_64-linux-gnu/libc.so.6(fputs+0x9c) [0x7f7a26982a0c]: 
/usr/games/crawl-git-cac7fed025(_Z3endibPKcz+0x211) [0x6d78d1]: end(int, bool, char const*, ...)
/usr/games/crawl-git-cac7fed025(_Z9save_gamebPKc+0x160) [0x6f2cb0]: save_game(bool, char const*)
/usr/games/crawl-git-cac7fed025() [0x82ca23]
/usr/games/crawl-git-cac7fed025() [0x82d7e5]
/usr/games/crawl-git-cac7fed025(main+0x303) [0x536eb3]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f7a26938ead]: 
/usr/games/crawl-git-cac7fed025() [0x5a986d]