[Octave-bug-tracker] [bug #66659] Octave crashes with SIGSEGV when debugging class methods

[Torsten Lilge]

URL:
  <https://savannah.gnu.org/bugs/?66659>

                 Summary: Octave crashes with SIGSEGV when debugging class
methods
                   Group: GNU Octave
               Submitter: ttl
               Submitted: Mon 13 Jan 2025 08:13:16 PM CET
                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: dev
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Mon 13 Jan 2025 08:13:16 PM CET By: Torsten Lilge <ttl>
Steps to reprodcue:

1. Consider as a minimal example the simple old style class "my_class" which
is attached to this report together with a test script 
2. >> y = my_class (10)
3. >> dbstop @my_class/is_zero 3
4. >> is_zero (y)
5. Modify and save @my_class/is_zero.m
6. >> dbstatus
7. Crash with SIGSEGV

The commands above are also included in 'dbg_my_class.m'

The crash occurs in bp-table.cc:765:

760  user_code_provider (const std::string& who, const std::string&
fcn_ident,
761                        octave_user_code *pfcn, bool silent = false)
762      : m_fcn (nullptr), m_is_valid (false)
763    {
764      m_fcn = pfcn;
765      bool f1 = m_fcn->is_classdef_method ();
766      bool f2 = m_fcn->is_classdef_constructor ();

To my findings, fcn-info.cc:646 (in out_of_date_check) is also involved:

646 bptab.remove_all_breakpoints_from_function (canonical_nm,
647                                             true);

Here, canonical_nm does only contain "is_zero" instead of "@my_class/is_zero".
Could this be the cause?

I was also thinking that this might be related to my changes in cset
https://hg.savannah.gnu.org/hgweb/octave/rev/85ca9f4242c5 but the crash occurs
in build without these changes as well.







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