bugGNU Octave - Bugs: bug #47927, Ctrl+C crashes Octave on MacOS


bug #47927: Ctrl+C crashes Octave on MacOS

Submitted by:  Ben Abbott <bpabbott>
Submitted on:  Mon 16 May 2016 12:11:44 AM UTC  
Category: InterpreterSeverity: 4 - Important
Priority: 5 - NormalItem Group: Segfault, Bus Error, etc.
Status: NoneAssigned to: None
Originator Name: Ben AbbottOpen/Closed: Open
Release: devOperating System: Mac OS

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Tue 02 May 2017 07:27:42 PM UTC, comment #12:

I can confirm that the Ctrl+C still crashes Octave GUI in MacOS with 4.0.3. The about window states: Octave was configured for "x86_64-apple-darwin14.5.0".

It doesn't crash the octave-cli, and works as expected (prints ^C, creates new line.).

I tested re-assigning the Ctrl-C in Preferences>>Shortcuts to something harmless, but that did not solve the problem.

However just tested 4.2.1 installed through brew, for which Ctrl-C does not crash the GUI. I just wanted to write it here so that others can try to upgrade if they are having issues with earlier versions.

Batuhan Osmanoglu <bosmanoglu>
Fri 20 Jan 2017 07:30:10 PM UTC, comment #11:

Fellype - your observation looks like bug #49609. Take a look at that report and help debug if you can.

Mike Miller <mtmiller>
Project Administrator
Fri 20 Jan 2017 07:07:00 PM UTC, comment #10:

I have a more critical problem here...
I'm running octave-4.2.0 on Slackware 14.2, with KDE 4.14.
When I type ctrl+c in the octave gui, it acts like a ctrl+alt+backspace and try to restart the X. An error message is displayed and the octave-gui window still open until you click on the OK button of the error message.
Bizarre :-O

Fellype do Nascimento <fellype>
Wed 31 Aug 2016 12:05:14 AM UTC, comment #9:

I recently upgraded from Mac OS 10.10 to 10.11. Since the upgrade the gui build with Fink doesn't work for me. That is likely due to some changes to clang, which I can likely figure out, but haven't attempted yet.

In any event, a 4.0.3 build using homebrew does run for me.

Ben Abbott <bpabbott>
Project Member
Tue 30 Aug 2016 08:47:50 PM UTC, comment #8:

I spoke too soon, all seams to be taken care of at the end of QTerminal.cc.
Sorry for the noise.

Pantxo Diribarne <pantxo>
Project Member
Tue 30 Aug 2016 08:26:07 PM UTC, comment #7:

@Ben: about comment #6, are you running pure cli or "--no-gui"?

I wanted to comment on the suspicious code below (from TerminalView.cc):

In Octave Ctrl+C is ubiquitous:

  • it is the default shortcut for "copy to clipboard" on all platforms but Mac. On Mac I'd expect CTRL+C not to be caught by Octave (as copyClipboard is CMD+C).

@Ben: does CMD+C have any effect in the terminal? in the terminal preferences tab, is the option "Disable global shortcuts ..." checked? Can you try to change the shortcut for copyClipboard to CTRL+C, and eventually play with the above option?

  • in the command window it means "interrupt unless text selected".

Instead of watching copyClipboard events, we should watch actual CTRL+C keyboard events and decide what to do if CTRL+C is actually the shortcut for copyClipboard.

Pantxo Diribarne <pantxo>
Project Member
Tue 09 Aug 2016 12:26:23 AM UTC, comment #6:

ugh ... the gui no longer comes up for me. Even so, ctrl-c doesn't terminate Octave.

If I run the cli, and hit ctrl-c several times, I'm able to trigger an ASAN error and if I continue I get "panic: Abort trap: 6 -- stopping myself..."

Ben Abbott <bpabbott>
Project Member
Mon 08 Aug 2016 08:40:29 PM UTC, comment #5:

@Ben: Can you check whether Ctrl+C still crashes the MacOS GUI?

Rik <rik5>
Project Administrator
Wed 25 May 2016 12:42:44 PM UTC, comment #4:

Possibly related to similar Ctrl-C crashing on Windows, able to reproduce consistently when calling the pager (less)

Nicholas Jankowski <nrjank>
Mon 16 May 2016 04:12:12 PM UTC, comment #3:

I checked 4.0.2. It also crashes for me.

Ben Abbott <bpabbott>
Project Member
Mon 16 May 2016 09:59:03 AM UTC, comment #2:

I can't reproduce this on Linux, so I've added "on MacOS" to the summary.

The log says that it is accessing a NULL pointer within the readline library itself, in rl_read_key.

Thread 5 seems to be at the same point as Thread 0, the one that crashed, until the innermost stack frame. Thread 5 is performing a __select, whereas Thread 0 is in rl_read_key.

It seem odd. Would you be able to do a code bisection to find where it started?

Lachlan Andrew <lachlan>
Project Member
Mon 16 May 2016 12:15:12 AM UTC, comment #1:

When the gui crashes, I'm able to save a log. It is also attached.

(file #37170)

Ben Abbott <bpabbott>
Project Member
Mon 16 May 2016 12:11:44 AM UTC, original submission:

Running the gui, Ctrl+C crashes Octave.

Running with --no-gui Ctrl+C followed by a CR crashes Octave.

When it crashes a octave-workspace file is produced. I've attached it.

Ben Abbott <bpabbott>
Project Member


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

Attach File(s):

Attached Files
file #37170:  crash.log added by bpabbott (61KiB - application/octet-stream)
file #37169:  octave-workspace added by bpabbott (209B - application/octet-stream)


Depends on the following items: None found

   bug dependencies.


Carbon-Copy List
  • -unavailable- added by bosmanoglu (Posted a comment)
  • -unavailable- added by mtmiller (Posted a comment)
  • -unavailable- added by fellype (Posted a comment)
  • -unavailable- added by pantxo (Posted a comment)
  • -unavailable- added by nrjank (Posted a comment)
  • -unavailable- added by lachlan (Posted a comment)
  • -unavailable- added by bpabbott (Submitted the item)

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    Follow 6 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Tue 24 Jan 2017 06:26:44 PM UTCpantxoDependencies-=>bugs #50140 is dependent
    Sun 22 Jan 2017 03:40:21 PM UTCrik5Carbon-CopyRemoved 72865=>-
    Fri 01 Jul 2016 05:26:16 PM UTCrik5Severity3 - Normal=>4 - Important
    Mon 16 May 2016 09:59:03 AM UTClachlanSummaryCtrl+C crashes Octave=>Ctrl+C crashes Octave on MacOS
    Mon 16 May 2016 12:15:12 AM UTCbpabbottAttached File-=>Added crash.log, #37170
    Mon 16 May 2016 12:11:44 AM UTCbpabbottAttached File-=>Added octave-workspace, #37169

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