Obtained 32 stack frames.
/usr/games/crawl-git-71f451d4b8(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x615a3334a90e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-71f451d4b8(_Z20crash_signal_handleri+0x18f) [0x615a3334ad7f]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7fe409e42910]: 
/lib/x86_64-linux-gnu/libc.so.6(abort+0x8f) [0x7fe409e2686f]: 
/usr/games/crawl-git-71f451d4b8(+0x501f22) [0x615a33357f22]: 
/usr/games/crawl-git-71f451d4b8(_Z12AssertFailedPKcS0_iS0_z+0x1a1) [0x615a33358401]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-git-71f451d4b8(_Z23assert_valid_cursor_posv+0xc5) [0x615a33616525]: assert_valid_cursor_pos()
/usr/games/crawl-git-71f451d4b8(+0x4ca86a) [0x615a3332086a]: 
/usr/games/crawl-git-71f451d4b8(_Z11wrapcprintfPKcz+0xce) [0x615a333216ae]: wrapcprintf(char const*, ...)
/usr/games/crawl-git-71f451d4b8(_ZNK16formatted_string7displayEii+0xee) [0x615a3347513e]: formatted_string::display(int, int) const
/usr/games/crawl-git-71f451d4b8(_ZN14message_window4showEv+0x9f) [0x615a336bde1f]: message_window::show()
/usr/games/crawl-git-71f451d4b8(_ZN14message_window8add_itemENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE11prefix_typeb+0x310) [0x615a336be5e0]: message_window::add_item(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, prefix_type, bool)
/usr/games/crawl-git-71f451d4b8(_ZN13message_store10flush_prevEv+0x3fd) [0x615a336bf4ed]: message_store::flush_prev()
/usr/games/crawl-git-71f451d4b8(_Z17get_last_messagesB5cxx11ib+0x42) [0x615a336b6452]: get_last_messages[abi:cxx11](int, bool)
/usr/games/crawl-git-71f451d4b8(_Z13do_crash_dumpv+0xaa4) [0x615a333591b4]: do_crash_dump()
/usr/games/crawl-git-71f451d4b8(_Z20crash_signal_handleri+0x1fa) [0x615a3334adea]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7fe409e42910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x7fe409e9999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x7fe409e42866]: 
/usr/games/crawl-git-71f451d4b8(+0x501f1d) [0x615a33357f1d]: 
/usr/games/crawl-git-71f451d4b8(_Z12AssertFailedPKcS0_iS0_z+0x1a1) [0x615a33358401]: AssertFailed(char const*, char const*, int, char const*, ...)
/usr/games/crawl-git-71f451d4b8(_Z23assert_valid_cursor_posv+0xc5) [0x615a33616525]: assert_valid_cursor_pos()
/usr/games/crawl-git-71f451d4b8(+0x4ca86a) [0x615a3332086a]: 
/usr/games/crawl-git-71f451d4b8(_Z11wrapcprintfPKcz+0xce) [0x615a333216ae]: wrapcprintf(char const*, ...)
/usr/games/crawl-git-71f451d4b8(_Z17print_stats_levelv+0x70) [0x615a33818650]: print_stats_level()
/usr/games/crawl-git-71f451d4b8(_Z9new_levelb+0xc) [0x615a3398d1dc]: new_level(bool)
/usr/games/crawl-git-71f451d4b8(_Z12startup_stepv+0xbc1) [0x615a33991021]: startup_step()
/usr/games/crawl-git-71f451d4b8(+0xcbf49d) [0x615a33b1549d]: 
/usr/games/crawl-git-71f451d4b8(main+0x1f7) [0x615a3327c357]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7fe409e280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7fe409e28189]: 
/usr/games/crawl-git-71f451d4b8(_start+0x25) [0x615a3327ce45]: