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+--- Thread: Handling Python Fatal Error (/thread-32452.html)
Handling Python Fatal Error - richajain1785 - Feb-10-2021
Hello,
I have been trying to handle errors in my python code using try & except, but this is not able to handle refcount error which causes my application to crash.
The error I get is:
Fatal Python error: deallocating None
Current thread 0x00007f93428bb700 (most recent call first):
<Stack Trace which is not helping>
How can I handle this kind of error? Or how to identify the root cause for this?
Any help will be appreciated. Thanks.
RE: Handling Python Fatal Error - Larz60+ - Feb-10-2021
Please show an actual python traceback (error message)
unaltered and complete, within bbcode error tags
RE: Handling Python Fatal Error - richajain1785 - Feb-11-2021
(Feb-10-2021, 06:25 PM)Larz60+ Wrote: Please show an actual python traceback (error message)
unaltered and complete, within bbcode error tags
Here is the complete error:
Error:Fatal Python error: deallocating None
Current thread 0x00007f22d5148700 (most recent call first):
Thread 0x00007f27115dab80 (most recent call first):
File "/usr/lib/python3/dist-packages/gi/overrides/GLib.py", line 585 in run
File "myapp.py", line 271 in glib_mainloop
File "myapp.py", line 244 in main
File "myapp.py", line 302 in <module>RE: Handling Python Fatal Error - Larz60+ - Feb-11-2021
This error message still looks incomplete as there is no link back to your code (no traceback) which is what I was looking for.
So unfortunately it doesn't help much.
was there a part of the message not included?
RE: Handling Python Fatal Error - richajain1785 - Feb-11-2021
(Feb-11-2021, 09:55 AM)Larz60+ Wrote: This error message still looks incomplete as there is no link back to your code (no traceback) which is what I was looking for.
So unfortunately it doesn't help much.
was there a part of the message not included?
This is all I get in the error. myapp.py is my application python source.
RE: Handling Python Fatal Error - Larz60+ - Feb-11-2021
Can't say without seeing code.
RE: Handling Python Fatal Error - nilamo - Feb-12-2021
Looks like an error in the glib wrapper. Without knowing what you're doing, we'd just be making guesses.
RE: Handling Python Fatal Error - Tails86 - Oct-14-2021
Sorry for reviving an old thread. I just figured out what this error means after many hours of digging, and it frustrates me that I couldn't find good documentation on the error itself. This seems like a very easy mistake to make.
None is a special, global object. What "deallocating None" means is that the reference count on "None" has reached 0, and None is to be deallocated (AKA deleted). This is a bad thing! It likely means that a Python library written in C/C++ is returning Py_None for use in Python proper without first calling Py_INCREF(Py_None). The error then shows itself elsewhere in code because the ref count on None is now 1 too few. When someone throws away its reference to None, only then will this error present itself. It may or may not be a problem in GLib.py if this is the case.