Obtained 31 stack frames.
/usr/games/crawl-0.23(_Z17write_stack_traceP8_IO_FILEi+0x23) [0x6c9fd3]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-0.23(_Z20crash_signal_handleri+0x174) [0x6ca324]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x33060) [0x7fc2b375a060]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xcf) [0x7fc2b3ad6f9f]: 
/usr/games/crawl-0.23() [0x6d0f84]
/usr/games/crawl-0.23() [0x6d144f]
/usr/games/crawl-0.23(_Z20crash_signal_handleri+0x283) [0x6ca433]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x33060) [0x7fc2b375a060]: 
/usr/games/crawl-0.23(_ZNSt8_Rb_treeI9coord_defSt4pairIKS0_P10map_markerESt10_Select1stIS5_ESt4lessIS0_ESaIS5_EE11equal_rangeERS2_+0x40) [0x928210]: std::_Rb_tree<coord_def, std::pair<coord_def const, map_marker*>, std::_Select1st<std::pair<coord_def const, map_marker*> >, std::less<coord_def>, std::allocator<std::pair<coord_def const, map_marker*> > >::equal_range(coord_def const&)
/usr/games/crawl-0.23(_ZN11map_markers4findERK9coord_def15map_marker_type+0xd) [0x92657d]: map_markers::find(coord_def const&, map_marker_type)
/usr/games/crawl-0.23(_Z12orig_terrain9coord_def+0x1b) [0xb9708b]: orig_terrain(coord_def)
/usr/games/crawl-0.23(_Z13cell_is_runedRK9coord_def+0xc) [0xb9715c]: cell_is_runed(coord_def const&)
/usr/games/crawl-0.23(_Z17mons_can_traverseRK7monsterRK9coord_defbb+0x28) [0x9fd648]: mons_can_traverse(monster const&, coord_def const&, bool, bool)
/usr/games/crawl-0.23(_ZN16monster_pathfind16mons_traversableERK9coord_def+0x26) [0x9c5836]: monster_pathfind::mons_traversable(coord_def const&)
/usr/games/crawl-0.23(_ZN16monster_pathfind23calc_path_to_neighboursEv+0x98) [0x9c5d68]: monster_pathfind::calc_path_to_neighbours()
/usr/games/crawl-0.23(_ZN16monster_pathfind14start_pathfindEb+0x84) [0x9c5f74]: monster_pathfind::start_pathfind(bool)
/usr/games/crawl-0.23(_ZN16monster_pathfind13init_pathfindEPK7monster9coord_defbbb+0x5e) [0x9c604e]: monster_pathfind::init_pathfind(monster const*, coord_def, bool, bool, bool)
/usr/games/crawl-0.23(_Z12try_pathfindP7monster+0x301) [0x9c4151]: try_pathfind(monster*)
/usr/games/crawl-0.23(_Z16handle_behaviourP7monster+0x1649) [0x9645f9]: handle_behaviour(monster*)
/usr/games/crawl-0.23(_Z19handle_monster_moveP7monster+0x1a9b) [0x95f5fb]: handle_monster_move(monster*)
/usr/games/crawl-0.23(_Z15handle_monstersb+0x815) [0x9609f5]: handle_monsters(bool)
/usr/games/crawl-0.23() [0x7b174c]
/usr/games/crawl-0.23(_Z21cheibriados_time_stepi+0x96) [0x7bf136]: cheibriados_time_step(int)
/usr/games/crawl-0.23() [0x635049]
/usr/games/crawl-0.23(_Z15activate_talentRK6talent+0x90) [0x6383a0]: activate_talent(talent const&)
/usr/games/crawl-0.23(_Z16activate_abilityv+0x1d4) [0x638784]: activate_ability()
/usr/games/crawl-0.23(_Z15process_command12command_type+0x1bc) [0xc43d8c]: process_command(command_type)
/usr/games/crawl-0.23() [0xc46bb9]
/usr/games/crawl-0.23(main+0x55d) [0x62c3ed]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7fc2b37472e1]: 
/usr/games/crawl-0.23() [0x62d255]