Re: [gnugo-devel] fast liberties & patterns anchored in goal

[Daniel Bump]

> Dan:
> I can't reproduce the crash.  What build settings did you use?

When I first got the crash I was running the current CVS,
patched, with several experimental options. I then checked out 
3.1.24, patched it, and compiled with no configure options.

You can get the crash with the runtime options:

-l gnugo-3.1.24/regression/games/gwe.sgf -L231 --quiet -t

Here's the backtrace.

...

Top moves:
1. N6  0.23
2. P7  0.11

***assertion failure:
utils.c:813 - fast_liberties == liberties near N6***


   A B C D E F G H J K L M N O P Q R S T
19 . . . . . . O O X . . . . . . . . . . 19
18 . . . . . . O X O O O O O . . . . . . 18
17 . . O O . O O X X X X X X O O O O O O 17
16 . O O X O O O X . + . . X X X X X O X 16
15 O O X X X O X X . . . . . . . . X X X 15
14 O X . . X X . . . . . . . . . X . X X 14
13 X X . . . . X . . X . . X . . . X O O 13
12 . . . X . . X X X X . . . X . X X X O 12
11 . . . . X X . X O O X X X . X X O O O 11     WHITE has captured 4 stones
10 . . X + X . . X O X X O O X O O . . . 10     BLACK has captured 10 stones
 9 . X . X O X X X O X O O X X X O O . . 9
 8 . X X O O O O O O O . O O X X O . . . 8
 7 . X O . . O X O X X O . O X . O . . . 7
 6 X X O . O O X X O . . O . X X O . . . 6
 5 X O . . . X X O . O . . O O X O . . . 5
 4 O O . X . X X O . O . O . X O O O O X 4
 3 . . O X X . O . O O O O O O X X O X X 3
 2 . . O X X X O . O X X X X X X X X O . 2
 1 . . O O X . O O O X X X O . X . O . O 1
   A B C D E F G H J K L M N O P Q R S T

gnugo 3.1.24: You stepped on a bug.
Please save this game as an sgf file and mail it to address@hidden


Program received signal SIGABRT, Aborted.
0x40081401 in kill () from /lib/libc.so.6
(gdb) bt
#0  0x40081401 in kill () from /lib/libc.so.6
#1  0x4008121f in raise (sig=6) at ../sysdeps/posix/raise.c:28
#2  0x4008243f in abort () at ../sysdeps/generic/abort.c:134
#3  0x807b28e in abortgo (file=0x80d5169 "utils.c", line=813, 
    msg=0x80d520f "fast_liberties == liberties", x=13, y=12)
    at printutils.c:298
#4  0x809488d in accurate_approxlib (pos=293, color=1, maxlib=5, 
    libs=0xbfffec10) at utils.c:813
#5  0x80948c2 in confirm_safety (move=293, color=1, size=0, defense_point=0x0, 
    saved_dragons=0xbffff2a0, saved_worms=0xbfffec60) at utils.c:848
#6  0x806fa31 in move_reasons_confirm_safety (move=293, color=1, minsize=0)
    at move_reasons.c:1865
#7  0x809ae5c in review_move_reasons (the_move=0xbffff984, val=0xbffff960, 
    color=1, pure_threat_value=0.400000006, score=86.5) at value_moves.c:2591
#8  0x8063328 in do_genmove (move=0xbffff984, color=1, 
    pure_threat_value=0.400000006) at genmove.c:447
#9  0x8062de4 in genmove (i=0xbffff9b0, j=0xbffff9ac, color=1) at genmove.c:263
#10 0x80514ae in load_and_analyze_sgf_file (head=0x8737698, 
    gameinfo=0xbffffa90, untilstr=0xbffffdfc "231", benchmark=0, to_move=0)
    at play_solo.c:163
#11 0x804a343 in main (argc=6, argv=0xbffffcd4) at main.c:860
(gdb) f 6
#6  0x806fa31 in move_reasons_confirm_safety (move=293, color=1, minsize=0)
    at move_reasons.c:1865
(gdb) pascii move
N6

Dan