[Octave-bug-tracker] [bug #40364] segfault when comparing large sparse matrices for equality

[Andreas Weber]

Update of bug #40364 (project octave):

                  Status:                    None => Confirmed              
                 Summary: Octave consistently segfaults when this method is
run on the attached data => segfault when comparing large sparse matrices for
equality

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Follow-up Comment #2:

I want to clarify that my backtrace was the result from David Spies's test
case. In his code there is an

assert(mutex == mutex');


The same segfault can be reproduced with

a=sparse([1, 4.7e4], [1, 4.7e4],[ 1 1]);
x = a == a;


This is because in the constructor in Sparse.h:88

SparseRep (octave_idx_type nr, octave_idx_type nc, octave_idx_type nz = 0)

nz overflows for int32 when called in

Sparse.cc:208: rep = new typename Sparse<T>::SparseRep (nr, nc, nr*nc);



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