Obtained 26 stack frames.
/usr/games/crawl-git-e5b59a6c5f(_Z17write_stack_traceP8_IO_FILE+0x3e) [0x6521f246f80e]: write_stack_trace(_IO_FILE*)
/usr/games/crawl-git-e5b59a6c5f(_Z20crash_signal_handleri+0x18f) [0x6521f246fc7f]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7c808e842910]: 
/lib/x86_64-linux-gnu/libc.so.6(pthread_kill+0x11b) [0x7c808e89999b]: 
/lib/x86_64-linux-gnu/libc.so.6(raise+0x16) [0x7c808e842866]: 
/usr/games/crawl-git-e5b59a6c5f(+0x4eacad) [0x6521f247ccad]: 
/usr/games/crawl-git-e5b59a6c5f(_Z10die_nolinePKcz+0x16b) [0x6521f247d49b]: die_noline(char const*, ...)
/usr/games/crawl-git-e5b59a6c5f(_Z20crash_signal_handleri+0x2d0) [0x6521f246fdc0]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x42910) [0x7c808e842910]: 
/lib/x86_64-linux-gnu/libz.so.1(+0x9aca) [0x7c808eff3aca]: 
/lib/x86_64-linux-gnu/libz.so.1(deflate+0x194) [0x7c808eff5ac4]: 
/usr/games/crawl-git-e5b59a6c5f(_ZN12chunk_writer5writeEPKvj+0x3a) [0x6521f294048a]: chunk_writer::write(void const*, unsigned int)
/usr/games/crawl-git-e5b59a6c5f(_Z9tag_write8tag_typeR6writer+0x205) [0x6521f2ae4915]: tag_write(tag_type, writer&)
/usr/games/crawl-git-e5b59a6c5f(+0x5e8178) [0x6521f257a178]: 
/usr/games/crawl-git-e5b59a6c5f(_Z10save_levelRK8level_id+0x59) [0x6521f2584189]: save_level(level_id const&)
/usr/games/crawl-git-e5b59a6c5f(_Z10load_level20dungeon_feature_type14load_mode_typeRK8level_id+0x1f4f) [0x6521f258c71f]: load_level(dungeon_feature_type, load_mode_type, level_id const&)
/usr/games/crawl-git-e5b59a6c5f(_Z16floor_transition20dungeon_feature_typeS_8level_idbbbb+0xbd1) [0x6521f2a9dc21]: floor_transition(dungeon_feature_type, dungeon_feature_type, level_id, bool, bool, bool, bool)
/usr/games/crawl-git-e5b59a6c5f(_Z11take_stairs20dungeon_feature_typebbb+0xb9) [0x6521f2a9fc69]: take_stairs(dungeon_feature_type, bool, bool, bool)
/usr/games/crawl-git-e5b59a6c5f(_ZN5Delay6handleEv+0x46) [0x6521f249aeb6]: Delay::handle()
/usr/games/crawl-git-e5b59a6c5f(_Z12handle_delayv+0x39) [0x6521f249a939]: handle_delay()
/usr/games/crawl-git-e5b59a6c5f(+0xc8f485) [0x6521f2c21485]: 
/usr/games/crawl-git-e5b59a6c5f(+0xc8fe95) [0x6521f2c21e95]: 
/usr/games/crawl-git-e5b59a6c5f(main+0x1f7) [0x6521f23a3fd7]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x280d0) [0x7c808e8280d0]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x89) [0x7c808e828189]: 
/usr/games/crawl-git-e5b59a6c5f(_start+0x25) [0x6521f23a4ac5]: