[Python-mode] [ python-mode-Bugs-1215039 ] eat 100% CPU when "Force full reparse"

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Sat Jul 30 19:03:22 CEST 2005


Bugs item #1215039, was opened at 2005-06-04 23:16
Message generated for change (Comment added) made by todddeluca
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Shixin Zeng (pupilzeng)
Assigned to: Skip Montanaro (montanaro)
Summary: eat 100% CPU when "Force full reparse" 

Initial Comment:
it seems to come into a infinite loop, and I can't do
anything but Ctrl+C to end emacs and all my datas were
lost.
It ocurred every time I type M-/ for code completion.
my emacs is 23.0.0.1, checkout from the branch
unicode-2 on April, 2, 2005



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Comment By: Todd DeLuca (todddeluca)
Date: 2005-07-30 13:03

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Ok, I've created a simple reproducible example.  The
following code consistently freezes if the last character in
the file is '1'.  If there is a newline following the '1',
then everything is fine.
if 1 < 2:
    # die here                                             
                                                           
                                        
    x = 1

It also freezes under the same condition if you replace the
if statement with a for i in range(10): loop.

The following file does NOT freeze even if the '1' is the
last character in the file:
x = 1

So perhaps it has something to do with the indentation. 
Everything seems to hinge on there being no characters
following the last line of code.  I tried putting spaces on
the end of the 'x = 1' line and it still froze with a 'Force
full reparse' message.  Sometimes the 'Force full reparse'
message is not displayed when it freezes, but I think that
detail is insignificant.

I hope these code snippets are helpful in debugging the
problem.  Thank y'all for producing and maintaining
python-mode.  Its coloring and indenting features have been
very helpful to me, and I get the feeling I'm just
scratching the surface.

Cheers,
Todd


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Comment By: Todd DeLuca (todddeluca)
Date: 2005-07-30 12:29

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I am having the same problem.  

It started happening around the time my box was upgraded to
the new Debian stable release, Sarge.  

I am using version 4.75 of python-mode.  

The problem manifests seemingly randomly for me.  It seems
to happen more with short python files.  I can not think of
a long or old (pre-upgrade to sarge) python file where I've
had this problem.  

I am not using M-/ (code completion).  The problem may
manifest when I hit return to go to a new line or when I hit
backspace to unindent out of a block that I've just ended.  

I am using gnu emacs version 21.4.1

I am forced to kill <pid> from a different terminal to close
my emacs, since I run it in the foreground of a terminal.

Any suggestions for how to fix this problem would be greatly
appreciated.  It makes it nearly impossible to use
python-mode when at any time emacs can freeze and loose all
of my work (since my last save.)  I'm sorry I have not been
able to reproduce the problem consistently yet.  If that is
helpful I will attempt to do so.

Best regards,
Todd DeLuca

P.S. some diagnostic info (a repeat of what was mentioned
above):
$ emacs --version 
GNU Emacs 21.4.1

from top command:
3440 td23      14   0 19336  18m 2900 R 99.9  0.5  16:05.32
emacs

python-mode version (from C-c C-v): version $Revision: 4.75 $


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Comment By: Shixin Zeng (pupilzeng)
Date: 2005-06-09 07:39

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M-: py-version RET
"$Revision 4.63 $"
I downloaded it from
http://sourceforge.net/projects/python-mode, whose version
was tagged as 1.0alpha
Where can I get the version 4.75?

I've tried write codes as you said:
a.foo = 12
a.  M-/ repeatly
First: "py"
Seconed: Force full parse and the problem occurred.

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Comment By: Skip Montanaro (montanaro)
Date: 2005-06-09 07:04

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Hmmm...  It's been years and years since Python-mode 1.0alpha was
released, so I suspect you're looking in the wrong place for the version.  
We are currently at 4.75.  You can get the current python-mode version
by typing

    M-: py-version RET

When I hit M-/ at the place you indicated, it completes with "c12".
I have no idea why it chooses that completion, but it doesn't hang.
It's not obvious to me what it should expand in this context.  Did
you have something in mind?  If I change the code to

    ...
    a = A('abc')
    a.foo = 12
    a.

when I hit M-/ it properly expands to "a.foo" for me.

Please try upgrading your python-mode.

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Comment By: Shixin Zeng (pupilzeng)
Date: 2005-06-09 06:33

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When I'm editing C source files in cc-mode, the problem
doesn't occur

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Comment By: Shixin Zeng (pupilzeng)
Date: 2005-06-09 05:44

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OK, here's an example:
#!/usr/bin/python
class A:
        def __init__(self, name):
                 self.name = name

if __name__ == '__main__':
        a = A('abc')
        a.<------------- M-/ here, the bug can be reproduced

the python-mode is 1.0alpha

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Comment By: Skip Montanaro (montanaro)
Date: 2005-06-06 23:19

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Can you provide an example Python file where this happens?  Given that
M-/ runs dabbrev-expand, I'm skeptical this has anything to do with
python-mode.


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Comment By: Skip Montanaro (montanaro)
Date: 2005-06-05 07:10

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What version of python-mode.el are you using?


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