[bug #68225] mrdivide causes a segmentation fault

Ian Proudler <[email protected]> Fri, 10 Apr 2026 04:43:41 -0400 (EDT)
Newsgroups	gmane.comp.gnu.octave.bugs
Message-ID	<[email protected]>
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URL:
  <https://savannah.gnu.org/bugs/?68225>

                 Summary: mrdivide causes a segmentation fault
                   Group: GNU Octave
               Submitter: ikproudler
               Submitted: Fri 10 Apr 2026 08:43:38 AM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Segfault, Bus Error, etc.
                  Status: None
             Assigned to: None
         Originator Name: ikproudler
        Originator Email:
             Open/Closed: Open
         Discussion Lock: Unlocked
                 Release: 11.1.0
        Operating System: GNU/Linux
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Fri 10 Apr 2026 08:43:38 AM UTC By: Ian Proudler <ikproudler>
Just installed the Flatpak version of Octave 11.1.0

Previously bug-free code caused a segmentation fault. I've traced it to the
mrdivide function -- see attached script "mdiv_prob.m".

I used the Flatpak debug option and gdb to obtain a backtrace -- see file
"mrdivide-problem".

=========

The version of Octave: flatpak (x86_64-pc-linux-gnu) version 11.1.0.

A complete input file that will reproduce the bug:    mdiv_prob.m

The type of machine you are using, and the operating system name and version
number:
Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.12
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.8.0-107-generic (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5700G with Radeon Graphics
Memory: 27.3 GiB of RAM
Graphics Processor: AMD Radeon Graphics
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7A38
System Version: 8.0

The command-line arguments you gave to the configure command when you
installed the interpreter: flatpak install flathub org.octave.Octave

A complete list of any modifications you have made to the interpreter source:
I have installed the following from "Octave Forge" but htey are not loaded.
control-4.2.1
linear-algebra-2.2.4
parallel-4.0.2
signal-1.4.7
struct-1.0.18







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File Attachments:

Name: mdiv_prob.m                    Size: 84B
    <https://file.savannah.gnu.org/file/mdiv_prob.m?file_id=58457>

Name: mrdivide-problem               Size: 6.4KiB
    <https://file.savannah.gnu.org/file/mrdivide-problem?file_id=58458>



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