[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix.

[Rik]

Update of bug #56232 (project octave):

                  Status:                    None => Confirmed              

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Follow-up Comment #1:

Confirmed.  That is exceedingly odd.  I can also confirm that the segfault
goes back through version 4.2.1 so this behavior has probably always been
present, but never quite hit upon.

Slightly longer backtrace to show the full code path


#0  0x00007fc47cabdbfb in SparseMatrix::tinverse (this=0x7fc44fff6110,
mattype=..., 
    address@hidden: 0, address@hidden: 0, calccond=false)
    at liboctave/array/dSparse.cc:734
#1  0x00007fc47cabf271 in SparseMatrix::inverse (this=0x7fc44fff6420,
mattype=..., 
    address@hidden: 0, address@hidden: 0, calc_cond=true)
    at liboctave/array/dSparse.cc:983
#2  0x00007fc47e4b3500 in Finv (args=..., nargout=0) at
libinterp/corefcn/inv.cc:146


Inspecting things in SparseMatrix::inverse, I think (C -C) may be corrupting
the dim_vector within the Sparse representation.




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