Obtained 35 stack frames.
/usr/games/crawl-bcrawl(_Z17write_stack_traceP8_IO_FILEi+0x27) [0x55f3eda61837]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-bcrawl(_Z20crash_signal_handleri+0x159) [0x55f3eda61c09]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3bfd0) [0x7f5bcc573fd0]: 
/lib/x86_64-linux-gnu/libc.so.6(memcpy+0xd) [0x7f5bcc5dabbd]: 
/usr/games/crawl-bcrawl(+0x3be567) [0x55f3eda6f567]: 
/usr/games/crawl-bcrawl(_Z17level_vault_namesB5cxx11b+0x99) [0x55f3eda71d79]: level_vault_names[abi:cxx11](bool)
/usr/games/crawl-bcrawl(_Z17debug_dump_levgenv+0x400) [0x55f3eda72490]: debug_dump_levgen()
/usr/games/crawl-bcrawl(_Z13do_crash_dumpv+0x4e9) [0x55f3eda69db9]: do_crash_dump()
/usr/games/crawl-bcrawl(_Z20crash_signal_handleri+0x1ca) [0x55f3eda61c7a]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3bfd0) [0x7f5bcc573fd0]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x8ad3c) [0x7f5bcc5c2d3c]: 
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x12) [0x7f5bcc573f32]: 
/lib/x86_64-linux-gnu/libc.so.6(abort+0xd3) [0x7f5bcc55e472]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x7f340) [0x7f5bcc5b7340]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x946ba) [0x7f5bcc5cc6ba]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x9652a) [0x7f5bcc5ce52a]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_free+0x6f) [0x7f5bcc5d0d9f]: 
/usr/games/crawl-bcrawl(_ZN9map_linesD1Ev+0xdc) [0x55f3edcbf43c]: map_lines::~map_lines()
/usr/games/crawl-bcrawl(_ZN7map_defD1Ev+0x7f2) [0x55f3edb113e2]: map_def::~map_def()
/usr/games/crawl-bcrawl(_Z24level_clear_vault_memoryv+0x42) [0x55f3edaf5942]: level_clear_vault_memory()
/usr/games/crawl-bcrawl(_Z15dgn_reset_levelb+0x146) [0x55f3edb00786]: dgn_reset_level(bool)
/usr/games/crawl-bcrawl(+0x45bafa) [0x55f3edb0cafa]: 
/usr/games/crawl-bcrawl(_Z7builderb+0x239) [0x55f3edb0fa69]: builder(bool)
/usr/games/crawl-bcrawl(_Z14generate_levelRK8level_id+0xa52) [0x55f3edb430e2]: generate_level(level_id const&)
/usr/games/crawl-bcrawl(_Z10load_level20dungeon_feature_type14load_mode_typeRK8level_id+0x469) [0x55f3edb437e9]: load_level(dungeon_feature_type, load_mode_type, level_id const&)
/usr/games/crawl-bcrawl(_Z16floor_transition20dungeon_feature_typeS_8level_idbbbb+0x538) [0x55f3edf2f848]: floor_transition(dungeon_feature_type, dungeon_feature_type, level_id, bool, bool, bool, bool)
/usr/games/crawl-bcrawl(_Z11take_stairs20dungeon_feature_typebbb+0x11f) [0x55f3edf324ff]: take_stairs(dungeon_feature_type, bool, bool, bool)
/usr/games/crawl-bcrawl(_ZN5Delay6handleEv+0x46) [0x55f3eda821b6]: Delay::handle()
/usr/games/crawl-bcrawl(_Z12handle_delayv+0x27) [0x55f3eda81b57]: handle_delay()
/usr/games/crawl-bcrawl(+0x99f57d) [0x55f3ee05057d]: 
/usr/games/crawl-bcrawl(+0x99fcb5) [0x55f3ee050cb5]: 
/usr/games/crawl-bcrawl(main+0x163) [0x55f3ed9c0e13]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x271ca) [0x7f5bcc55f1ca]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x85) [0x7f5bcc55f285]: 
/usr/games/crawl-bcrawl(_start+0x21) [0x55f3ed9c1641]: