[Octave-bug-tracker] [bug #50198] Calling "error" from the GUI thread lead to segfaults

[Pantxo Diribarne]

URL:
  <http://savannah.gnu.org/bugs/?50198>

                 Summary: Calling "error" from the GUI thread lead to
segfaults
                 Project: GNU Octave
            Submitted by: pantxo
            Submitted on: Tue 31 Jan 2017 02:14:48 PM GMT
                Category: GUI
                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: dev
        Operating System: GNU/Linux

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Details:

Since I don't know how to provoke an error in the GUI thread, I intensionally
added a call to "error" in gl2ps_renderer::draw.


diff -r 0224e047fbb9 libinterp/corefcn/gl2ps-print.cc
--- a/libinterp/corefcn/gl2ps-print.cc  Fri Jan 20 21:40:11 2017 +0100
+++ b/libinterp/corefcn/gl2ps-print.cc  Tue Jan 31 15:09:13 2017 +0100
@@ -190,6 +190,7 @@
   void
   gl2ps_renderer::draw (const graphics_object& go, const std::string&
print_cmd)
   {
+    error ("Expect Octave to return gracefully");
     static bool in_draw = false;
     static std::string old_print_cmd;
     static GLint buffsize;


After recompiling with this in place I can see that printing with fltk returns
gracefully while with Qt (which runs the the gl2ps_renderer from the GUI
thread):


octave:1> graphics_toolkit fltk
octave:2> plot (1:10)
octave:3> print toto.eps
error: Expect Octave to return gracefully
error: called from
    __opengl_print__ at line 169 column 7
    print at line 504 column 14
octave:3> close all
octave:4> graphics_toolkit qt
octave:5> plot (1:10)
octave:6> print toto.eps
error: Expect Octave to return gracefully
terminate called after throwing an instance of 'octave::execution_exception'
Aborted





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