Obtained 31 stack frames.
/usr/games/crawl-0.34(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x5bcbb8fa395e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x18f) [0x5bcbb8fa3dcf]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x722b64442910]: 
/lib/x86_64-linux-gnu/libc.so.6(abort+0x8f) [0x722b6442686f]: 
/usr/games/crawl-0.34(+0x501f72) [0x5bcbb8fb0f72]: 
/usr/games/crawl-0.34(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x5bcbb8fb1477]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-0.34(_ZNK12monster_info11common_nameB5cxx11E22description_level_type+0x1424) [0x5bcbb93aeff4]: monster_info::common_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK12monster_info11proper_nameB5cxx11E22description_level_type+0x48) [0x5bcbb93af108]: monster_info::proper_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK7monster4nameB5cxx11E22description_level_typebb+0xcf) [0x5bcbb940bc9f]: monster::name[abi:cxx11](description_level_type, bool, bool) const
/usr/games/crawl-0.34(_Z15debug_item_scanv+0x6ed) [0x5bcbb8fb761d]: debug_item_scan()
/usr/games/crawl-0.34(_Z13do_crash_dumpv+0x199b) [0x5bcbb8fb30fb]: do_crash_dump()
/usr/games/crawl-0.34(_Z20crash_signal_handleri+0x1fa) [0x5bcbb8fa3e3a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x722b64442910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x722b6449999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x722b64442866]: 
/usr/games/crawl-0.34(+0x501f6d) [0x5bcbb8fb0f6d]: 
/usr/games/crawl-0.34(_Z12AssertFailedPKcS0_iS0_z+0x1c7) [0x5bcbb8fb1477]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-0.34(_ZNK12monster_info11common_nameB5cxx11E22description_level_type+0x1424) [0x5bcbb93aeff4]: monster_info::common_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK12monster_info11proper_nameB5cxx11E22description_level_type+0x48) [0x5bcbb93af108]: monster_info::proper_name[abi:cxx11](description_level_type) const
/usr/games/crawl-0.34(_ZNK7monster4nameB5cxx11E22description_level_typebb+0xcf) [0x5bcbb940bc9f]: monster::name[abi:cxx11](description_level_type, bool, bool) const
/usr/games/crawl-0.34(_Z15debug_item_scanv+0x6ed) [0x5bcbb8fb761d]: debug_item_scan()
/usr/games/crawl-0.34(_Z18check_map_validityv+0x1e7) [0x5bcbb8fb7a07]: check_map_validity()
/usr/games/crawl-0.34(_Z8tag_readR6reader8tag_type+0x20bf) [0x5bcbb963ec6f]: tag_read(reader&, tag_type)
/usr/games/crawl-0.34(+0x6046e7) [0x5bcbb90b36e7]: 
/usr/games/crawl-0.34(_Z10load_level20dungeon_feature_type14load_mode_typeRK8level_id+0x1507) [0x5bcbb90bec57]: load_level(dungeon_feature_type, load_mode_type, level_id const&)
/usr/games/crawl-0.34(_Z12startup_stepv+0xadf) [0x5bcbb95e9f3f]: startup_step()
/usr/games/crawl-0.34(+0xcbf49d) [0x5bcbb976e49d]: 
/usr/games/crawl-0.34(main+0x1f7) [0x5bcbb8ed5347]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x722b644280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x722b64428189]: 
/usr/games/crawl-0.34(_start+0x25) [0x5bcbb8ed5e35]: