Obtained 24 stack frames.
/usr/games/crawl-git-ff9aefc16b(_Z17write_stack_traceP8_IO_FILEi+0x23) [0x688373]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-git-ff9aefc16b(_Z20crash_signal_handleri+0x174) [0x6886c4]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x321e0) [0x7fd0e04c31e0]: 
/usr/games/crawl-git-ff9aefc16b() [0x883330]
/lib/x86_64-linux-gnu/libc.so.6(+0x321e0) [0x7fd0e04c31e0]: 
/lib/x86_64-linux-gnu/libpthread.so.0(waitpid+0x1c) [0x7fd0e082bc4c]: 
/usr/games/crawl-git-ff9aefc16b(_Z8call_gdbP8_IO_FILE+0x1c3) [0x6889e3]: call_gdb(_IO_FILE*)
/usr/games/crawl-git-ff9aefc16b(_Z13do_crash_dumpv+0x3d9) [0x68fa39]: do_crash_dump()
/usr/games/crawl-git-ff9aefc16b(_Z20crash_signal_handleri+0x74) [0x6885c4]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x321e0) [0x7fd0e04c31e0]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0x2b) [0x7fd0e082bf6b]: 
/usr/games/crawl-git-ff9aefc16b() [0x68f1b4]
/usr/games/crawl-git-ff9aefc16b() [0x68f43a]
/usr/games/crawl-git-ff9aefc16b() [0x636ed9]
/usr/games/crawl-git-ff9aefc16b(_Z16aim_battlesphereP5actor10spell_typeiR4bolt+0x10a) [0xadd08a]: aim_battlesphere(actor*, spell_type, int, bolt&)
/usr/games/crawl-git-ff9aefc16b(_Z16handle_mon_spellP7monster+0x1b22) [0x93a542]: handle_mon_spell(monster*)
/usr/games/crawl-git-ff9aefc16b() [0x55653a]
/usr/games/crawl-git-ff9aefc16b(_Z19handle_monster_moveP7monster+0x14ed) [0x91091d]: handle_monster_move(monster*)
/usr/games/crawl-git-ff9aefc16b(_Z15handle_monstersb+0x7f5) [0x9122e5]: handle_monsters(bool)
/usr/games/crawl-git-ff9aefc16b(_Z12world_reactsv+0xb2) [0xbdf212]: world_reacts()
/usr/games/crawl-git-ff9aefc16b() [0xbe5996]
/usr/games/crawl-git-ff9aefc16b(main+0x63d) [0x5f0d5d]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7fd0e04afead]: 
/usr/games/crawl-git-ff9aefc16b() [0x5f189d]