[Octave-bug-tracker] [bug #54527] Crash when concatenating empty elements with sparse matrices.

[Kai Torben Ohlhus]

URL:
  <http://savannah.gnu.org/bugs/?54527>

                 Summary: Crash when concatenating empty elements with sparse
matrices.
                 Project: GNU Octave
            Submitted by: siko1056
            Submitted on: Fri 17 Aug 2018 11:15:49 AM CEST
                Category: Interpreter
                Severity: 4 - Important
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.4.1
        Operating System: GNU/Linux

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Details:

I found a new one-liner to crash Octave:


e = 1;
E = [1 1 1]';

[e     ; sparse(1)];   ## works
[e(1:1); sparse(1)];   ## works
[e(1:0); 1        ];   ## works
[[]    ; sparse(1)];   ## works
[E(1:0); sparse(1)];   ## works
[sparse(1); E(1:0)];   ## works

[sparse(1); e(1:0,1)]; ## works, when explicitly reshaping the empty matrix
[e(1:0,1); sparse(1)]; ## works, see above

##[sparse(1); e(1:0)]; ## CRASH!!!
##[e(1:0); sparse(1)]; ## CRASH!!!

##vertcat (sparse(1), e(1:0)) ## CRASH!!!
##vertcat (e(1:0), sparse(1)) ## CRASH!!!

## works, because dimension of empty matrix is 1x0
horzcat (sparse(1), e(1:0));
horzcat (e(1:0), sparse(1));


The problem seems to be, when the matrix dimensions of the empty element are
wrong, something bad happens.




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