Obtained 19 stack frames.
/usr/games/crawl-0.23(_Z17write_stack_traceP8_IO_FILEi+0x23) [0x6ca153]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-0.23(_Z20crash_signal_handleri+0x174) [0x6ca4a4]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x33060) [0x7fcc66b19060]: 
/usr/games/crawl-0.23() [0x8d35b0]
/lib/x86_64-linux-gnu/libc.so.6(+0x33060) [0x7fcc66b19060]: 
/lib/x86_64-linux-gnu/libpthread.so.0(waitpid+0x18) [0x7fcc66e95ae8]: 
/usr/games/crawl-0.23(_Z8call_gdbP8_IO_FILE+0x1c3) [0x6ca7c3]: call_gdb(_IO_FILE*)
/usr/games/crawl-0.23(_Z13do_crash_dumpv+0x3d9) [0x6d19a9]: do_crash_dump()
/usr/games/crawl-0.23(_Z20crash_signal_handleri+0x74) [0x6ca3a4]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x33060) [0x7fcc66b19060]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xcf) [0x7fcc66e95f9f]: 
/usr/games/crawl-0.23() [0x6d1104]
/usr/games/crawl-0.23() [0x6d138a]
/usr/games/crawl-0.23(_ZN6player17set_level_visitedERK8level_id+0x98) [0x78d1e8]: player::set_level_visited(level_id const&)
/usr/games/crawl-0.23(_Z10load_level20dungeon_feature_type14load_mode_typeRK8level_id+0xdcd) [0x78e1ed]: load_level(dungeon_feature_type, load_mode_type, level_id const&)
/usr/games/crawl-0.23(_Z12startup_stepv+0xa90) [0xb4c080]: startup_step()
/usr/games/crawl-0.23(main+0x109) [0x62c139]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1) [0x7fcc66b062e1]: 
/usr/games/crawl-0.23() [0x62d3f5]