Obtained 24 stack frames.
/usr/games/crawl-potion_fun(_Z17write_stack_traceP8_IO_FILEi+0x21) [0x55c421]: write_stack_trace(_IO_FILE*, int)
/usr/games/crawl-potion_fun(_Z20crash_signal_handleri+0x1a8) [0x55c7e8]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0) [0x7f8d6ffb04c0]: 
/lib/x86_64-linux-gnu/libpthread.so.0(raise+0x2b) [0x7f8d70346b7b]: 
/usr/games/crawl-potion_fun() [0x563d59]
/usr/games/crawl-potion_fun() [0x564037]
/usr/games/crawl-potion_fun() [0x5446a6]
/usr/games/crawl-potion_fun(_Z11real_colourjRK9coord_def+0x22) [0x544a02]: real_colour(unsigned int, coord_def const&)
/usr/games/crawl-potion_fun(_Z14get_cell_glyphRK9coord_defbi+0x4b6) [0x90a946]: get_cell_glyph(coord_def const&, bool, int)
/usr/games/crawl-potion_fun(_Z10screenshotv+0x1a5) [0x9e7ac5]: screenshot()
/usr/games/crawl-potion_fun(_Z13do_crash_dumpv+0x1d0f) [0x565fcf]: do_crash_dump()
/usr/games/crawl-potion_fun(_Z20crash_signal_handleri+0x9c) [0x55c6dc]: crash_signal_handler(int)
/lib/x86_64-linux-gnu/libc.so.6(+0x364c0) [0x7f8d6ffb04c0]: 
/lib/x86_64-linux-gnu/libc.so.6(__write+0x10) [0x7f8d7005f100]: 
/lib/x86_64-linux-gnu/libc.so.6(_IO_file_write+0x43) [0x7f8d6fff3313]: 
/lib/x86_64-linux-gnu/libc.so.6(+0x791da) [0x7f8d6fff31da]: 
/lib/x86_64-linux-gnu/libc.so.6(_IO_file_xsputn+0x23e) [0x7f8d6fff3c8e]: 
/lib/x86_64-linux-gnu/libc.so.6(fputs+0x9d) [0x7f8d6ffe907d]: 
/usr/games/crawl-potion_fun(_Z3endibPKcz+0x221) [0x99a211]: end(int, bool, char const*, ...)
/usr/games/crawl-potion_fun(_Z9save_gamebPKc+0x1b5) [0x616eb5]: save_game(bool, char const*)
/usr/games/crawl-potion_fun() [0x742b8f]
/usr/games/crawl-potion_fun(main+0x63d) [0x747e7d]: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed) [0x7f8d6ff9b76d]: 
/usr/games/crawl-potion_fun() [0x4c0c39]