[Octave-bug-tracker] [bug #65431] crash after hgload certain data

[John W. Eaton]

Follow-up Comment #1, bug #65431 (group octave):

I'm able to reproduce the crash at that same line in graphics.cc.  See
https://hg.savannah.gnu.org/hgweb/octave/file/b5ffc06b39b2/libinterp/corefcn/graphics.cc#l9728
for the context of looping around that assignment.

Applying the attached change, I'm able to display some info about the indices
and dimensions at the point of the crash:


octave:1> hgload sphere_crash.ofig
fvc indices (row, kk): 1837, 0
cd indices (ii, jj, kk): 1, 612, 0
cd.dims: 3x3586
fvc.dims: 1837x1
idx.dims: 3x3586
idx.min/max - 1: 0, 10757
ii limit (idx.rows): 3
jj limit (nfaces): 3586
kk limit (fvc.columns): 1
error: __go_patch__: index (1838,_): out of bound 1837 (dimensions are
1837x1), unable to create graphics handle


and it shows that the indexing on FVC is incorrect and if I understand
correctly, the row index on that variable in the loop where the crash occurs
could be between 0 and 10757 but the row dimension of FVC is just 1837
elements.

I don't understand this code and I don't see an obvious fix.  Someone who
knows or can say what is supposed to be happening here will have to help to
resolve this problem.


(file #55802)

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