Obtained 26 stack frames.
/usr/games/crawl-git-0406aca7d3(_Z17write_stack_traceP8_IO_FILE+0x3b) [0x5581d0d1065b]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-0406aca7d3(_Z20crash_signal_handleri+0x1e5) [0x5581d0d10b05]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7fa4821faf20]: 
/lib/x86_64-linux-gnu/libc.so.6(sigprocmask+0xd) [0x7fa4821fb14d]: 
/lib/x86_64-linux-gnu/libc.so.6(abort+0xac) [0x7fa4821fc76c]: 
/usr/games/crawl-git-0406aca7d3(+0x3942e0) [0x5581d0d182e0]: 
/usr/games/crawl-git-0406aca7d3(+0x394695) [0x5581d0d18695]: 
/usr/games/crawl-git-0406aca7d3(+0x972dd3) [0x5581d12f6dd3]: 
/usr/games/crawl-git-0406aca7d3(_ZN14TilesFramework14send_milestoneERK11xlog_fields+0x128) [0x5581d12f75a8]: TilesFramework::send_milestone(xlog_fields const&)
/usr/games/crawl-git-0406aca7d3(_Z14mark_milestoneRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES6_S6_l+0x4ea) [0x5581d0e6a77a]: mark_milestone(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, long)
/usr/games/crawl-git-0406aca7d3(_Z13do_crash_dumpv+0x1ea1) [0x5581d0d1a691]: do_crash_dump()
/usr/games/crawl-git-0406aca7d3(_Z20crash_signal_handleri+0xae) [0x5581d0d109ce]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7fa4821faf20]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xc7) [0x7fa4825bf727]: 
/usr/games/crawl-git-0406aca7d3(+0x3942db) [0x5581d0d182db]: 
/usr/games/crawl-git-0406aca7d3(+0x39454e) [0x5581d0d1854e]: 
/usr/games/crawl-git-0406aca7d3(_Z15behaviour_eventP7monster14mon_event_typePK5actor9coord_defb+0xfc4) [0x5581d0fe24c4]: behaviour_event(monster*, mon_event_type, actor const*, coord_def, bool)
/usr/games/crawl-git-0406aca7d3(_Z17slime_wall_damageP5actori+0x2ef) [0x5581d12400ff]: slime_wall_damage(actor*, int)
/usr/games/crawl-git-0406aca7d3(_Z19handle_monster_moveP7monster+0x369) [0x5581d0fd9b09]: handle_monster_move(monster*)
/usr/games/crawl-git-0406aca7d3(_Z15handle_monstersb+0x98d) [0x5581d0fdc3cd]: handle_monsters(bool)
/usr/games/crawl-git-0406aca7d3(_Z12world_reactsv+0xf5) [0x5581d130b355]: world_reacts()
/usr/games/crawl-git-0406aca7d3(+0x9895a4) [0x5581d130d5a4]: 
/usr/games/crawl-git-0406aca7d3(+0x989b3d) [0x5581d130db3d]: 
/usr/games/crawl-git-0406aca7d3(main+0x39b) [0x5581d0c6c04b]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7fa4821ddb97]: 
/usr/games/crawl-git-0406aca7d3(_start+0x2a) [0x5581d0c6c88a]: