[Octave-bug-tracker] [bug #55469] JIT crash related to complex numbers

[Julien Bect]

URL:
  <https://savannah.gnu.org/bugs/?55469>

                 Summary: JIT crash related to complex numbers
                 Project: GNU Octave
            Submitted by: jbect
            Submitted on: Mon 14 Jan 2019 09:46:18 AM UTC
                Category: Interpreter
                Severity: 3 - Normal
                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: 5.0.1
        Operating System: Any

    _______________________________________________________

Details:

The JIT currently crashes Octave on some very simple loops involving complex
numbers.

This is not a new issue, there are already a few commented tests in jit.tst in
relation with this.  I am just reporting this for later reference.

As far as I can tell, this issue is present on both stable and default, and
with any version of LLVM that we can build with.

Here is a minimal snippet that reproduces the problem:

jit_enable (true);
x = 1 + 1i;
while (1),
  x = x + 1;
  break;
endwhile
-verbatim.

Or, if you prefer for loops:

jit_enable (true);
jit_startcnt (100)
x = 1 + 1i;
for j = 1:200
    x = x + 1;
endfor


In both cases, Octave crashes:

fatal: caught signal Segmentation fault -- stopping myself...
Segmentation fault
-verbatim+

In both cases also, the problem disappears if the initial value is not
complex.




    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?55469>

_______________________________________________
  Message sent via Savannah
  https://savannah.gnu.org/