Re: [gnugo-devel] Bug in 3.0.0

[Daniel Bump]

Przemo wrote:

> I'm the administrator of PlGS Go server. I installed gnugo 3.0.0 and let the
> users play with it. For few days it behaves strangely, it crashes. I attach
> the log from gnugoclient (used to connect gnugo to the server). The
> suspicious game start around line 1643 (in my opinion). As the sgf was not
> created, I can only attach the fragment of sgf file, which was saved as
> "stored" game (attached).

Gunnar wrote:

> What program saved it as "stored"? If you have set savebasepath to
> something reasonable in GnugoConfig.h, gnugoclient should have written
> a good sgf file there. Anyhow, the log file you sent includes the
> entire set of gtp commands leading up to the crash, so it should
> suffice to reproduce the crash. However, I don't get a crash with
> 3.0.0, so there's something bad going on here. Therefore we need some
> more input:
> 
> * What platform (hardware, OS, compiler) are you using?
> * Have you modified GNU Go 3.0.0 in any way?
> * Did you use any interesting configure flags when building it?
> * Can you reproduce the crash by saving the commands below in a file
>   crash.gtp and then run "gnugo --quiet --mode gtp < crash.gtp"?
> * If it crashes, would you be able to run it in gdb to get a
>   backtrace? It may sometimes be easier to get a useful backtrace if
>   you first set a breakpoint at abortgo.

Perhaps it made a core file, in which case can you load it in GDB
and get a back trace from that?

I'm replaying the game with 3.0.0 in case it is a persistent caching
problem.

I reconstructed the game as follows, removing the first off board B[zj]
and adding the 9 stone handicap. The final position is actually a good
semeai problem for GNU Go. Black should play B9 to make seki.

Dan

(;GM[1]FF[4]
SZ[19]
HA[9]AB[pd][dp][dd][pp][dj][pj][jp][jd][jj]
PW[tm21]
PB[GNU Go 3.0.0]
PC[Polish Go Server]DT[2002-02-27]AP[gnugoclient:2.0]
W[qf];B[qe];W[pf];B[nd];W[qn];B[pn];W[pm];B[on];W[qo];B[qp];W[om]
;B[np];W[nn];B[nm];W[nl];B[mm];W[ml];B[lp];W[nf];B[qi];W[qk];B[rg];W[rf]
;B[nj];W[mj];B[ph];W[ni];B[rj];W[rk];B[oi];W[nh];B[qg];W[oh];B[qj];W[qc]
;B[pc];W[qd];B[ld];W[pe];B[cn];W[pg];B[eq];W[si];B[rh];W[sj];B[ri];W[nk]
;B[oj];W[cf];B[ce];W[df];B[fd];W[di];B[bf];W[bg];B[be];W[ej];B[cj];W[ci]
;B[ek];W[fj];B[gl];W[hk];B[im];W[he];B[hl];W[gk];B[hc];W[ik];B[kg];W[ke]
;B[kd];W[kf];B[ii];W[jk];B[hh];W[fe];B[if];W[ie];B[jh];W[lf];B[lm];W[ll]
;B[je];W[jf];B[ki];W[ig];B[hf];W[gf];B[hg];W[jg];B[fk];W[hi];B[km];W[kl]
;B[ol];W[pl];B[ok];W[jm];B[ro];W[rn];B[rp];W[jn];B[mn];W[rm];B[sn];W[ql]
;B[sl];W[sm];B[sk];W[rl];B[sk];W[so];B[in];W[jo];B[io];W[hq];B[ir];W[iq]
;B[jq];W[hr];B[jr];W[fq];B[bi];W[bh];B[bj];W[cq];B[cp];W[dq];B[bq];W[er]
;B[cr];W[dr];B[ep];W[br];B[go];W[fp];B[fo];W[bp];B[bo];W[aq];B[qb];W[rb]
;B[pb];W[rc];B[gd];W[ge];B[ip];W[op];B[po];W[oq];B[pr];W[nq];B[no];W[pq]
;B[mr];W[mq];B[lq];W[qr];B[nr];W[or];B[ps];W[rr];B[sr];W[sq];B[sp];W[rq]
;B[hs];W[gs];B[is];W[hp];B[qq];W[os];B[sh];W[qs];B[ra];W[lo];B[mp];W[ms]
;B[ls];W[ns];B[lr];W[kp];B[il];W[jl];B[pk];W[kq];B[sn];W[kr];B[ks];W[ko]
;B[gp];W[gq];B[ho];W[fr];B[oe];W[of];B[me];W[mf];B[ne];W[ee];B[ed];W[de]
;B[sb];W[sc];B[id];W[hd];B[af];W[ag];B[ai];W[sa];B[ei];W[eh];B[gj];W[fi]
;B[qa];W[sf];B[ao];W[ap];B[so];W[em];B[sb];W[fl];B[dl];W[dm];B[el];W[fm]
;B[cm];W[cl];B[dk];W[bl];B[gm];W[gc];B[bm];W[ic];B[hb];W[gb];B[ib];W[db]
;B[bc];W[cc];B[cd];W[bb];B[ab];W[ba];B[fb];W[eb];B[fc];W[ea];B[dc];W[le]
;B[cb];W[ln];B[sa];W[kn];B[sg];W[eo];B[al];W[ak];B[do];W[en];B[ah];W[am]
)