Obtained 50 stack frames.
/usr/games/crawl-git-84510d75b0(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x5578298cf82e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-84510d75b0(_Z20crash_signal_handleri+0x18f) [0x5578298cfc9f]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x77926c491330]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11c) [0x77926c4eab2c]: 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x1e) [0x77926c49127e]: 
/usr/games/crawl-git-84510d75b0(+0x4f0ddd) [0x5578298dcddd]: 
/usr/games/crawl-git-84510d75b0(_Z10die_nolinePKcz+0x16b) [0x5578298dd5cb]: die_noline(char const*, ...)
/usr/games/crawl-git-84510d75b0(_Z20crash_signal_handleri+0x2d0) [0x5578298cfde0]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x45330) [0x77926c491330]: 
/usr/games/crawl-git-84510d75b0(_Z20is_travelsafe_squareRK9coord_defbbb+0x205) [0x557829fad555]: is_travelsafe_square(coord_def const&, bool, bool, bool)
/usr/games/crawl-git-84510d75b0(_ZN15travel_pathfind10path_floodERK9coord_defS2_+0x1ec) [0x557829fb129c]: travel_pathfind::path_flood(coord_def const&, coord_def const&)
/usr/games/crawl-git-84510d75b0(_ZN15travel_pathfind18path_examine_pointERK9coord_def+0xd2) [0x557829fad8d2]: travel_pathfind::path_examine_point(coord_def const&)
/usr/games/crawl-git-84510d75b0(_ZN15travel_pathfind8pathfindE13run_mode_typeb+0x186) [0x557829fadd86]: travel_pathfind::pathfind(run_mode_type, bool)
/usr/games/crawl-git-84510d75b0(_Z26fill_travel_point_distanceRK9coord_defPSt6vectorIS_SaIS_EE+0x10e) [0x557829fae33e]: fill_travel_point_distance(coord_def const&, std::vector<coord_def, std::allocator<coord_def> >*)
/usr/games/crawl-git-84510d75b0(+0xbc2452) [0x557829fae452]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: 
/usr/games/crawl-git-84510d75b0(+0xbc26d9) [0x557829fae6d9]: