Obtained 22 stack frames.
/usr/games/crawl-bcadren(_Z17write_stack_traceP8_IO_FILE+0x3b) [0x56321b6d177b]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-bcadren(_Z20crash_signal_handleri+0x1e5) [0x56321b6d1c25]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7f3cca066f20]: 
/usr/games/crawl-bcadren(_Z23raw_feature_descriptionB5cxx11RK9coord_def+0x5f) [0x56321b7494df]: raw_feature_description[abi:cxx11](coord_def const&)
/usr/games/crawl-bcadren(_Z13do_crash_dumpv+0x2537) [0x56321b6dc7b7]: do_crash_dump()
/usr/games/crawl-bcadren(_Z20crash_signal_handleri+0xae) [0x56321b6d1aee]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x3ef20) [0x7f3cca066f20]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0xc7) [0x7f3cca42b727]: 
/usr/games/crawl-bcadren(+0x396d6b) [0x56321b6d9d6b]: 
/usr/games/crawl-bcadren(+0x396fde) [0x56321b6d9fde]: 
/usr/games/crawl-bcadren(+0x73cc77) [0x56321ba7fc77]: 
/usr/games/crawl-bcadren(+0x749754) [0x56321ba8c754]: 
/usr/games/crawl-bcadren(_Z22remove_slime_mutationsv+0xb8) [0x56321ba8d178]: remove_slime_mutations()
/usr/games/crawl-bcadren(_Z8tag_readR6reader8tag_type+0x2122) [0x56321bc14ef2]: tag_read(reader&, tag_type)
/usr/games/crawl-bcadren(+0x4673d5) [0x56321b7aa3d5]: 
/usr/games/crawl-bcadren(+0x4681d2) [0x56321b7ab1d2]: 
/usr/games/crawl-bcadren(_Z12restore_gameRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x1f) [0x56321b7abebf]: restore_game(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
/usr/games/crawl-bcadren(_Z12startup_stepv+0x1468) [0x56321bbdaf88]: startup_step()
/usr/games/crawl-bcadren(+0x9b8df9) [0x56321bcfbdf9]: 
/usr/games/crawl-bcadren(main+0x323) [0x56321b61f1f3]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xe7) [0x7f3cca049b97]: 
/usr/games/crawl-bcadren(_start+0x2a) [0x56321b61f8fa]: