Obtained 31 stack frames.
/usr/games/crawl-0.34(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x56b6910ff8ae]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x18f) [0x56b6910ffd1f]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7f9255642910]: 
/lib/x86_64-linux-gnu/libc.so.6(abort+0x8f) [0x7f925562686f]: 
/usr/games/crawl-0.34(+0x501ec2) [0x56b69110cec2]: 
/usr/games/crawl-0.34(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x56b69110d3c7]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-0.34(_ZNK12monster_info11common_nameB5cxx11E22description_level_type+0x1424) [0x56b69150af24]: monster_info::common_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK12monster_info11proper_nameB5cxx11E22description_level_type+0x48) [0x56b69150b038]: monster_info::proper_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK7monster4nameB5cxx11E22description_level_typebb+0xcf) [0x56b691567bcf]: monster::name[abi:cxx11](description_level_type, bool, bool) const
/usr/games/crawl-0.34(_Z15debug_item_scanv+0x6ed) [0x56b69111356d]: debug_item_scan()
/usr/games/crawl-0.34(_Z13do_crash_dumpv+0x199b) [0x56b69110f04b]: do_crash_dump()
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x1fa) [0x56b6910ffd8a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7f9255642910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x7f925569999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x7f9255642866]: 
/usr/games/crawl-0.34(+0x501ebd) [0x56b69110cebd]: 
/usr/games/crawl-0.34(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x56b69110d3c7]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-0.34(_ZNK12monster_info11common_nameB5cxx11E22description_level_type+0x1424) [0x56b69150af24]: monster_info::common_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK12monster_info11proper_nameB5cxx11E22description_level_type+0x48) [0x56b69150b038]: monster_info::proper_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK7monster4nameB5cxx11E22description_level_typebb+0xcf) [0x56b691567bcf]: monster::name[abi:cxx11](description_level_type, bool, bool) const
/usr/games/crawl-0.34(_Z15debug_item_scanv+0x6ed) [0x56b69111356d]: debug_item_scan()
/usr/games/crawl-0.34(_Z18check_map_validityv+0x1e7) [0x56b691113957]: check_map_validity()
/usr/games/crawl-0.34(_Z8tag_readR6reader8tag_type+0x20bf) [0x56b69179ab9f]: tag_read(reader&, tag_type)
/usr/games/crawl-0.34(+0x604637) [0x56b69120f637]: 
/usr/games/crawl-0.34(_Z10load_level20dungeon_feature_type14load_mode_typeRK8level_id+0x1507) [0x56b69121aba7]: load_level(dungeon_feature_type, load_mode_type, level_id const&)
/usr/games/crawl-0.34(_Z12startup_stepv+0xadf) [0x56b691745e6f]: startup_step()
/usr/games/crawl-0.34(+0xcbf3cd) [0x56b6918ca3cd]: 
/usr/games/crawl-0.34(main+0x1f7) [0x56b6910312f7]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7f92556280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7f9255628189]: 
/usr/games/crawl-0.34(_start+0x25) [0x56b691031de5]: