Obtained 28 stack frames.
/usr/games/crawl-git-3d7ae589ec(_Z17write_stack_traceP8_IO_FILEi+0x28) [0x55c49b563b68]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-git-3d7ae589ec(_Z20crash_signal_handleri+0x1bf) [0x55c49b563faf]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x33030) [0x7f9cccc20030]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xcf) [0x7f9cccf9cf9f]: 
/usr/games/crawl-git-3d7ae589ec(+0x3066c6) [0x55c49b56b6c6]: 
/usr/games/crawl-git-3d7ae589ec(+0x306a63) [0x55c49b56ba63]: 
/usr/games/crawl-git-3d7ae589ec(_Z20crash_signal_handleri+0x274) [0x55c49b564064]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x33030) [0x7f9cccc20030]: 
/usr/games/crawl-git-3d7ae589ec(_Z15get_feature_def20dungeon_feature_type+0) [0x55c49b61b990]: get_feature_def(dungeon_feature_type)
/usr/games/crawl-git-3d7ae589ec(_Z12feat_is_wall20dungeon_feature_type+0x9) [0x55c49ba20699]: feat_is_wall(dungeon_feature_type)
/usr/games/crawl-git-3d7ae589ec(_ZNK16opacity_no_transclERK9coord_def+0x57) [0x55c49b781147]: opacity_no_trans::operator()(coord_def const&) const
/usr/games/crawl-git-3d7ae589ec(_ZN16monster_pathfind11traversableERK9coord_def+0x21) [0x55c49b8618e1]: monster_pathfind::traversable(coord_def const&)
/usr/games/crawl-git-3d7ae589ec(_ZN16monster_pathfind23calc_path_to_neighboursEv+0xbc) [0x55c49b861edc]: monster_pathfind::calc_path_to_neighbours()
/usr/games/crawl-git-3d7ae589ec(_ZN16monster_pathfind14start_pathfindEb+0x85) [0x55c49b862235]: monster_pathfind::start_pathfind(bool)
/usr/games/crawl-git-3d7ae589ec(_ZN16monster_pathfind13init_pathfindEPK7monster9coord_defbbb+0x55) [0x55c49b862695]: monster_pathfind::init_pathfind(monster const*, coord_def, bool, bool, bool)
/usr/games/crawl-git-3d7ae589ec(_Z12try_pathfindP7monster+0x2cc) [0x55c49b85f68c]: try_pathfind(monster*)
/usr/games/crawl-git-3d7ae589ec(_Z16handle_behaviourP7monster+0x16cd) [0x55c49b80951d]: handle_behaviour(monster*)
/usr/games/crawl-git-3d7ae589ec(_Z15behaviour_eventP7monster14mon_event_typePK5actor9coord_defb+0x2a8) [0x55c49b80a928]: behaviour_event(monster*, mon_event_type, actor const*, coord_def, bool)
/usr/games/crawl-git-3d7ae589ec(_ZN10noise_grid19apply_noise_effectsERK9coord_defiRK7noise_ti+0xcb) [0x55c49b95ac6b]: noise_grid::apply_noise_effects(coord_def const&, int, noise_t const&, int)
/usr/games/crawl-git-3d7ae589ec(_ZN10noise_grid15propagate_noiseEv+0x1c2) [0x55c49b95ae72]: noise_grid::propagate_noise()
/usr/games/crawl-git-3d7ae589ec(_Z12apply_noisesv+0x152) [0x55c49b95b272]: apply_noises()
/usr/games/crawl-git-3d7ae589ec(_Z15handle_monstersb+0xb17) [0x55c49b8062d7]: handle_monsters(bool)
/usr/games/crawl-git-3d7ae589ec(_Z12world_reactsv+0xbc) [0x55c49bacba2c]: world_reacts()
/usr/games/crawl-git-3d7ae589ec(+0x86cf00) [0x55c49bad1f00]: 
/usr/games/crawl-git-3d7ae589ec(+0x86d975) [0x55c49bad2975]: 
/usr/games/crawl-git-3d7ae589ec(main+0x136) [0x55c49b4cdb86]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7f9cccc0d2b1]: 
/usr/games/crawl-git-3d7ae589ec(_start+0x2a) [0x55c49b4ce21a]: