[Octave-bug-tracker] [bug #52977] Octave can be caused to crash with autoload'ed functions

[Olaf Till]

URL:
  <http://savannah.gnu.org/bugs/?52977>

                 Summary: Octave can be caused to crash with autoload'ed
functions
                 Project: GNU Octave
            Submitted by: i7tiol
            Submitted on: Fri 26 Jan 2018 12:15:42 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: Olaf Till
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Octave version (development branch):
c241918d4c92, 2018-01-19 08:09:21 -0800

Octave can be caused to crash with autoload'ed functions.

The same (?) thing, with identical upper 2 frames of the backtrace,
happened to me in installation of a package with autoload'ed
functions, causing me to construct this procedure to reproduce
(hopefully the same) bug without package installation.

Reproduce:

- for an arbitrary single DEFUN_DLD function "some_function" in file
"test_interface.cc", build "test_interface.oct".
(for example this minimal function in file test_interface.cc:)

#include <octave/oct.h>

DEFUN_DLD (some_function, , , "")
{
  return octave_value_list ();
}

- from Octave commandline:

autoload ("some_function", "test_interface.oct")

- from Octave commandline, call:

some_function

- from an external shell commandline:

touch test_interface.oct

- from Octave commandline, call a 2nd time:

some_function

-> crash

(Hint: In the test case, this possibly happened because with the alias
'autoload ("name_1", "name_2.oct")' the file was re-loaded after increasing
modification time, while ordinarily (without an alias, and the file beeing
named 'some_function.oct') only a warning is displayed:

warning: library /home/olaf/devel/src/test/some_function.oct not reloaded due
to existing references)



Program received signal SIGSEGV, Segmentation fault.
octave_value::operator= (address@hidden, a=...)
    at ./libinterp/octave-value/ov.h:366
366             rep->count++;
(gdb) bt
#0  octave_value::operator= (address@hidden, a=...)
    at ./libinterp/octave-value/ov.h:366
#1  0x00007ffff73d55ed in octave::load_fcn_from_file (
   
file_name="/home/olaf/octave/parallel-3.1.1/x86_64-pc-linux-gnu-api-v51+/parallel_interface.oct",

    dir_name="/home/olaf/octave/parallel-3.1.1/x86_64-pc-linux-gnu-api-v51+",

    dispatch_type="", package_name="", fcn_name="", autoload=false)
    at libinterp/parse-tree/oct-parse.yy:4753


rest of backtrace varies:

this was what I got in package installation:


#2  0x00007ffff752e800 in octave::fcn_info::fcn_info_rep::find_user_function
(
    address@hidden) at libinterp/corefcn/fcn-info.cc:757


and this is from with the described procedure to reproduce the bug:


#2  0x00007ffff7892cde in load_out_of_date_fcn (
    ff="/home/olaf/devel/src/test/test_interface.oct", dir_name="", 
    function=..., dispatch_type="", package_name="")
    at libinterp/corefcn/symtab.cc:99
#3  0x00007ffff789609c in octave::out_of_date_check (function=..., 
    dispatch_type="", address@hidden)
    at libinterp/corefcn/symtab.cc:258
#4  0x00007ffff752d911 in octave::fcn_info::fcn_info_rep::find_autoload (
    address@hidden) at libinterp/corefcn/fcn-info.cc:712
#5  0x00007ffff75304e7 in octave::fcn_info::fcn_info_rep::xfind (
    address@hidden, args=..., address@hidden)
    at libinterp/corefcn/fcn-info.cc:504
#6  0x00007ffff7530caf in octave::fcn_info::fcn_info_rep::find (this=0x7b30a0,

    args=..., address@hidden)
    at libinterp/corefcn/fcn-info.cc:353
#7  0x00007ffff7894303 in find (local_funcs=true, args=..., 
    this=<optimized out>) at libinterp/corefcn/fcn-info.h:244
#8  octave::symbol_table::fcn_table_find (address@hidden, 
    name="some_function", args=..., address@hidden)
    at libinterp/corefcn/symtab.cc:390
#9  0x00007ffff78911c3 in octave::symbol_scope_rep::find (this=0x687b20, 
    name="some_function", args=..., address@hidden,

    address@hidden) at libinterp/corefcn/symscope.cc:84
#10 0x00007ffff7892ebd in find (local_funcs=true, skip_variables=true, 
    args=..., name="", this=<optimized out>)
    at libinterp/corefcn/symscope.h:655
#11 octave::symbol_table::find (address@hidden, 
    name="some_function", args=..., address@hidden,

    address@hidden) at libinterp/corefcn/symtab.cc:358
#12 0x00007ffff7894855 in octave::symbol_table::find_function (this=0x66ee50,

    name="some_function", args=..., address@hidden)
    at libinterp/corefcn/symtab.cc:430
#13 0x00007ffff788f22d in octave::symbol_record::find_function (
    address@hidden, name="some_function", args=...)
    at libinterp/corefcn/symrec.cc:115
#14 0x00007ffff73f5eed in octave::symbol_record::find (
    address@hidden, address@hidden, args=...)
    at libinterp/corefcn/symrec.h:562
#15 0x00007ffff73e833b in octave::tree_evaluator::visit_identifier (
    this=0x66ef10, expr=...) at libinterp/parse-tree/pt-eval.cc:1059





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