bugGNU Octave - Bugs: bug #62587, __FILE__ crashes the interpreter


bug #62587: __FILE__ crashes the interpreter

Submitter:  None
Submitted:  Sun 05 Jun 2022 08:02:10 PM UTC
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Regression
Status:  Fixed Assigned to:  None
Originator Name:  Eduardo Pellini Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 7.1.0
Operating System:  * Any
* Mandatory Fields

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Thu 09 Jun 2022 02:47:07 PM UTC, comment #12: 

If a BIST consists of only a single `assert` statement, it is more concise to use the `%!assert` syntax for it.
I made that change here (and also moved the new BISTs to lex.ll because after reconsidering I think they match even better in that file):

Markus Mützel <mmuetzel>
Project Member
Thu 09 Jun 2022 01:16:32 PM UTC, comment #11: 

Thanks, Markus. I pushed it here: https://hg.savannah.gnu.org/hgweb/octave/rev/4dbd8d999b9e

Only after pushing did I realize I made a typo in the bug number in the commit message (I wrote 52587 instead of 62587). Facepalm.

Arun Giridhar <arungiridhar>
Project Member
Thu 09 Jun 2022 06:52:09 AM UTC, comment #10: 

@Arun: In general, more tests are a good thing. But it is probably not necessary to add this as a fixed test. Instead, you could add these tests to `oct-parse.yy`. Maybe close to the test that checks that keywords can't be used as variable names:

Maybe also separate them into two BISTs (starting with `%!assert <*62587>`) to make it easier to pinpoint which command it is in case they should start to fail at some point.

Markus Mützel <mmuetzel>
Project Member
Wed 08 Jun 2022 08:58:00 PM UTC, comment #9: 

This works properly for me now. Do we need to add a BIST like in comment #5?

Arun Giridhar <arungiridhar>
Project Member
Tue 07 Jun 2022 12:11:20 PM UTC, comment #8: 

The same change needed to be made in a number of places in the base_lexer::make_keyword_token function.  I pushed my change here:


I did not merge stable to default because a previous change has some merge conflicts that I'm not sure how to resolve.

John W. Eaton <jwe>
Project Administrator
Mon 06 Jun 2022 01:42:31 PM UTC, comment #7: 

Thank you, jwe. That patch works for me too. Updating status.

Arun Giridhar <arungiridhar>
Project Member
Mon 06 Jun 2022 04:12:47 AM UTC, comment #6: 

The attached change appears to fix the problem for me.  I can check in a proper changeset tomorrow.

(file #53279)

John W. Eaton <jwe>
Project Administrator
Mon 06 Jun 2022 01:50:19 AM UTC, comment #5: 

A possible BIST is attached as a Mercurial diff.

Note: As of now, this BIST will crash the interpreter, even when marked as a known bug, and cause "make check" to exit with an error.

(file #53278)

Arun Giridhar <arungiridhar>
Project Member
Mon 06 Jun 2022 01:14:24 AM UTC, comment #4: 

Found it. It was this revision: https://hg.savannah.gnu.org/hgweb/octave/rev/a001811a68e6

Paging jwe.

Bisection trail:

30904:04120d65778a    ## 7.1.0, known crash,     Apr 2022
29655:32f4357ac8d9    ## 6.xx, found to be good, May 2021
30145:cd6f7957c889    ## crash  2021 Sep 09
29924:aeba7278cf80    ## good   2021 Jul 28
30036:80373844f8b2    ## good   2021 Aug 24
30090:1575b324613d    ## good   2021 Aug 31
30118:d809b99f1280    ## good   2021 Sep 05
30131:a471bf0f78ba    ## good   2021 Sep 04
30138:2dca5c25237d    ## good   2021 Sep 08 10:46 UTC
30141:58f043641a78    ## crash  2021 Sep 08 23:02 UTC
30139:c789e728d57a    ## good   2021 Sep 08 15:14 UTC
30140:a001811a68e6    ## crash  2021 Sep 08 21:35 UTC

The first bad revision is:
changeset:   30140:a001811a68e6
summary:     use parser functions to build parse tree objects in grammar rule actions

Arun Giridhar <arungiridhar>
Project Member
Sun 05 Jun 2022 09:00:16 PM UTC, comment #3: 

A plain call to _FILE_ and _LINE_ on 6.4.0 give the following:

octave:1> __FILE__
ans = stdin
octave:2> __LINE__
ans = 1

Both those cause panic_impossible on 7.1.0 and 8.

Arun Giridhar <arungiridhar>
Project Member
Sun 05 Jun 2022 08:48:34 PM UTC, comment #2: 

Same thing happens with _LINE_. Even though it doesn't make sense with fileparts, it should at least give an error without crashing.

On 6.4.0:

octave:1> [a,b,c] = fileparts(__LINE__)
error: fileparts: FILENAME must be a single string
error: called from
    fileparts at line 42 column 5

On 7.1.0:

octave:1> [a,b,c] = fileparts (__LINE__)
panic: impossible state reached in file '/home/jwe/src/octave-stable/libinterp/parse-tree/oct-parse.yy' at line 2878
fatal: caught signal Aborted -- stopping myself...
Aborted (core dumped)

Arun Giridhar <arungiridhar>
Project Member
Sun 05 Jun 2022 08:29:56 PM UTC, comment #1: 

I can reproduce this crash on Linux. Changing OS to Any and status to Confirmed.

On Octave 6.4.0:

octave:1> [a,b,c] = fileparts (__FILE__)
a =
b = stdin
c =

On Octave 7.1.0:

octave:1> [a,b,c] = fileparts (__FILE__)
panic: impossible state reached in file '/home/jwe/src/octave-stable/libinterp/parse-tree/oct-parse.yy' at line 2878
fatal: caught signal Aborted -- stopping myself...
Aborted (core dumped)

On Octave 8:

octave:1> [a,b,c] = fileparts (__FILE__)
panic: impossible state reached in file '../libinterp/parse-tree/oct-parse.yy' at line 2878
fatal: caught signal Aborted -- stopping myself...
Aborted (core dumped)

Arun Giridhar <arungiridhar>
Project Member
Sun 05 Jun 2022 08:02:10 PM UTC, original submission:  

Dear friends,

Some (rock solid) scripts i had written in the past started to fail after upgrade to Octave 7.1.0.

After a lot of 'hide and seek' activities, trying to understand if the problem was related to some kind of character encoding wars, I found that a single call (I used it for years) to get the current script location and name, was crashing the entire interpreter!

It`s easy to reproduce, simply typing...

[ScriptDir, ScriptName, ScriptExt] = fileparts (_FILE_);

... and everything falls apart.

The single call to the keyword _FILE_ in the interpreter is crashing everything! The GUI exits without any error message.

Running from command prompt I found the following information:

octave:1> _FILE_
panic: impossible state reached in file '/home/jwe/src/octave-stable/libinterp/parse-tree/oct-parse.yy' at line 2878
fatal: caught signal Aborted -- stopping myself...

My workaround today is to use:
[ScriptDir, ScriptName, ScriptExt] = fileparts(mfilename('fullpath'));

I'm a brazilian user, using Windows 10 (in portuguese pt-br). I always change my interface language to 'en_us', and the editor character encoding to 'utf-8' to avoid problems. I don't guess this is a problem related to these adjustments.

I guess the problem is somewhat related to some underlying file system function. Other bug reports describes something wrong with dir() function as well. I think the problems are related.

I'm available to supply any further information you need.

Keep up the good work!
Eduardo Pellini



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Attach Files:

Attached Files
file #53279:  line-file-token-diffs.txt added by jwe (1KiB - text/plain)
file #53278:  fileline.patch added by arungiridhar (2KiB - text/x-patch)


Depends on the following items: None found

Items that depend on this one: None found


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  • -email is unavailable- added by mmuetzel (Posted a comment)
  • -email is unavailable- added by jwe (Updated the item)
  • -email is unavailable- added by arungiridhar
  • -email is unavailable- added by arungiridhar (Posted a comment)
  • -email is unavailable- added by None (Submitted the item)

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    Follow 11 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2022-06-09 arungiridhar StatusReady For Test Fixed
        Open/ClosedOpen Closed
    2022-06-07 jwe StatusPatch Submitted Ready For Test
    2022-06-06 arungiridhar StatusConfirmed Patch Submitted
    2022-06-06 jwe Attached File- Added line-file-token-diffs.txt, #53279
    2022-06-06 arungiridhar Item GroupSegfault, Bus Error, etc. Regression
    2022-06-06 arungiridhar Attached File- Added fileline.patch, #53278
    2022-06-06 arungiridhar Item GroupNone Segfault, Bus Error, etc.
    2022-06-06 arungiridhar Carbon-Copy- Added jwe
    2022-06-05 arungiridhar StatusNone Confirmed
        Operating SystemMicrosoft Windows Any

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