[Octave-bug-tracker] [bug #31734] SEGFAULT when using sparse matrices with certain index combinations

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?31734>

                 Summary: SEGFAULT when using sparse matrices with certain
index combinations
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Mon 22 Nov 2010 01:58:32 PM PST
                Category: Interpreter
                Severity: 4 - Important
                Priority: 5 - Normal
              Item Group: Crash
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

    _______________________________________________________

Details:

The indexing for sparse matrices is occasionally broken.  A sample test
program is attached.  This bug is not present in 3.2.4, but is present with
tip 11285:107e7476a5da.  This is for an x86_64 machine.


spvar = spalloc (30^3, 1, 100);

#for i = [4 1154 3 4] # to cause segfault
for i = [4 1154 3]    # to see bad variable indices
  spvar(i) += i
endfor


Output is


spvar =       

Compressed Column Sparse (rows = 27000, cols = 1, nnz = 1 [0.0037%])

  (4, 1) ->  4

spvar =

Compressed Column Sparse (rows = 27000, cols = 1, nnz = 2 [0.0074%])

  (4, 1) ->  4
  (1154, 1) ->  1154

spvar =

Compressed Column Sparse (rows = 27000, cols = 1, nnz = 3 [0.011%])

  (3, 1) ->  3
  (1154, 1) ->  1154
  (-2076787047, 1) ->  1.5526e-316





    _______________________________________________________

File Attachments:


-------------------------------------------------------
Date: Mon 22 Nov 2010 01:58:32 PM PST  Name: segtest.m  Size: 182B   By: rik5

<http://savannah.gnu.org/bugs/download.php?file_id=22082>

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?31734>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/