[issue34570] Segmentation fault in _PyType_Lookup

[Irit Katriel]

Irit Katriel  added the comment:

Python 2.7 is no longer supported. If you are having the issue with Python 3, 
please open a new issue.

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nosy: +iritkatriel
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue34570] Segmentation fault in _PyType_Lookup

[STINNER Victor]

STINNER Victor  added the comment:

Again, I'm 90% sure that it's a bug in a third party module and so you should 
report the crash to pybot, not to Python.

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[issue34570] Segmentation fault in _PyType_Lookup

[STINNER Victor]

STINNER Victor  added the comment:

Core dumps are usually unusable on a different platform. You should extract 
informations yourself using gdb or something else. At least, I'm sure that I 
will be unable to use your core dump on Fedora (you are using Ubuntu). You can 
open a core dump using "gdb python2.7 -c coredump" and then type "where" to get 
the C traceback.

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[issue34570] Segmentation fault in _PyType_Lookup

[Pablosky]

Pablosky  added the comment:

Victor,

I am not familiar with code of pybot and RobotFramwework. So I don't know what 
extensions they are using.

I am attaching more backtraces of cores I was able to catch.

I am doing now some experiments and I am trying to find maximum amount of pybot 
processes which can run simultaneously without crash.

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Added file: https://bugs.python.org/file47786/python_cores.zip

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[issue34570] Segmentation fault in _PyType_Lookup

[STINNER Victor]

STINNER Victor  added the comment:

You can install and enable faulthandler to get the Python traceback where the 
bug occurs. It is likely that the bug comes from a third party C extension.

What are the C extensions used by pybot?

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[issue34570] Segmentation fault in _PyType_Lookup

[Pablosky]

Pablosky  added the comment:

My system is Hp Z4 with 128GB ram. It is not rather problem of lack of memory. 
When I monitored free memory it took at most 30GB when these 20 pybots were 
working.

I wonder if it is possible that these separate programs (pybots) interfere each 
other. I mean that sharing the same modules/libraries cause that situations. 
Maybe one instance is recompiling py module to pyc at the same time when this 
is used by another process. Is it possible?

I have never caught segfault when there was only one instance of pybot.

BTW I caught 3 more different cores. I consider reinstalling my whole system 
(maybe Ubuntu 18.04). Maybe my system is broken.

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[issue34570] Segmentation fault in _PyType_Lookup

[Stefan Behnel]

Stefan Behnel  added the comment:

Thanks for the report.
Is the place where it crashes always the same?
Could it be that your system is running out of resources, e.g. RAM?

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nosy: +scoder

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[issue34570] Segmentation fault in _PyType_Lookup

[Pablosky]

New submission from Pablosky :

Platform details:
Ubuntu 16.04 LTS (64 bit)
Python 2.7.12

I am using Robot framework environment for testing. It looks segmentation fault 
appears when there is a lot (like 20) of pybot (Robot Framework component) 
instances running in the system. When the crash appears single pybot instance 
is killed. Rest is fine.

It happens sporadically. Like 4% of pybot executions.

--
components: ctypes
files: segfault.txt
messages: 324521
nosy: Pablosky
priority: normal
severity: normal
status: open
title: Segmentation fault in _PyType_Lookup
type: crash
versions: Python 2.7
Added file: https://bugs.python.org/file47783/segfault.txt

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