[rrd-developers] Re: rrd_graph.c: draw_horizontal_grid(), im->maxval=NaN(0xfffffffffffff)

[Stanislav Sinyagin]

see below some more debug output.

It appeared that static pixie in ytr() has become infinite 
on some previous calls. Perhaps the near-zero values with huge 
exponent values cause the problem. 
I don't have currently the old CVS snapshots, but I can definitely say 
that few months ago this didn't happen.

Cheers,
Stan

Starting program: /usr/local/rrdtool-1.1.0/bin/rrdtool graph /tmp/aaaa.png --imgformat=PNG
--width=500 --height=400 DEF:A=/tmp/getdim-23809.rrd:A:AVERAGE LINE1:A#000000

Breakpoint 3, apply_gridfit (im=0xffbec968) at rrd_graph.c:483
483         double ypos1 = ytr(im, im->minval);
(gdb) p *im
$31 = {graphfile = "/tmp/aaaa.png", '\000' <repeats 1010 times>, xsize = 500, 
  ysize = 400, piesize = 0, graph_col = {4294967295, 4042322175, 3503345919, 
    2694881535, 2425393407, 3763359999, 255, 255, 4278190335}, text_prop = {{
      size = 10, 
      font = 0xe44d0 "/usr/openwin/lib/X11/fonts/TrueType/Arial.ttf"}, {
      size = 12, 
      font = 0xe44d0 "/usr/openwin/lib/X11/fonts/TrueType/Arial.ttf"}, {
      size = 8, 
      font = 0xe44d0 "/usr/openwin/lib/X11/fonts/TrueType/Arial.ttf"}, {
      size = 10, 
      font = 0xe44d0 "/usr/openwin/lib/X11/fonts/TrueType/Arial.ttf"}, {
      size = 10, 
      font = 0xe44d0 "/usr/openwin/lib/X11/fonts/TrueType/Arial.ttf"}}, 
  ylegend = '\000' <repeats 199 times>, 
  title = '\000' <repeats 180 times>, "ÿ¾Ð´\000\000\000\004", '\000' <repeats 11 times>,
draw_x_grid = 1, draw_y_grid = 1, grid_dash_on = 1, 
  grid_dash_off = 1, xlab_user = {minsec = -1, gridtm = TMT_SECOND, 
    gridst = 0, mgridtm = TMT_SECOND, mgridst = 0, labtm = TMT_SECOND, 
    labst = 0, precis = 0, stst = 0x0}, 
  xlab_form = '\000' <repeats 199 times>, ygridstep = NaN(0xfffffffffffff), 
  ylabfact = 0, tabwidth = 0, start = 1051289758, end = 1051376158, step = 0, 
  minval = 1.9999999999969307e-312, maxval = 2.4999999999986337e-312, 
  rigid = 0, ygrid_scale = {gridstep = 1.0000000000132873e-313, labfact = 1, 
    labfmt = '\000' <repeats 63 times>}, gridfit = 1, imginfo = 0x0, lazy = 0, 
  logarithmic = 0, xorigin = 0, yorigin = 0, pie_x = 0, pie_y = 0, ximg = 0, 
  yimg = 0, magfact = 9.9999999999846534e-313, base = 1000, symbol = 32 ' ', 
  unitsexponent = 9999, extra_flags = 0, prt_c = 0, gdes_c = 2, 
  gdes = 0x11bac0, canvas = 0x11b2c0}
(gdb) s
ytr (im=0xffbec968, value=1.9999999999969307e-312) at rrd_graph.c:137
137         if (isnan(value)){
(gdb) p value
$32 = 1.9999999999969307e-312
(gdb) n
143         } else if(!im->logarithmic) {
(gdb) 
144           yval = im->yorigin - pixie * (value - im->minval);
(gdb) p pixie
$33 = Infinity
(gdb) 

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