[issue38665] Crash when running SQLAlchemy with pyodbc

[Irit Katriel]

Change by Irit Katriel :


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resolution:  -> third party
stage:  -> resolved
status: open -> closed

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[issue38665] Crash when running SQLAlchemy with pyodbc

[Brett Cannon]

Brett Cannon  added the comment:

Basically you have to figure out where that bad memory came from and that's 
just plain hard in C short of slowly cutting out code until you get a small 
reproducer. Typically these sorts of issues are almost always in the extension 
modules, but your case is tricky as even if that's true you don't know which 
one is the cause.

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[issue38665] Crash when running SQLAlchemy with pyodbc

[Dave Johansen]

Dave Johansen  added the comment:

I can't. I just know that I'm running this process and this crash happens. Any 
recommendations on how to diagnose that?

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[issue38665] Crash when running SQLAlchemy with pyodbc

[Brett Cannon]

Brett Cannon  added the comment:

Can you trace this to actually being Python's fault? Unfortunately you're using 
two extension modules who both could be at fault with this.

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nosy: +brett.cannon

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[issue38665] Crash when running SQLAlchemy with pyodbc

[Dave Johansen]

New submission from Dave Johansen :

We're using SQLAlchemy 1.3.10 with pyodbc 4.0.27 in the python:3.7.5-alpine 
docker image to connect to a MySQL 13.0.5026.0 database and it's crashing with 
the following error:
python: malloc.c:2406: sysmalloc: Assertion `(old_top == initial_top (av) && 
old_size == 0) || ((unsigned long) (old_size) >= MINSIZE && prev_inuse 
(old_top) && ((unsigned long) old_end & (pagesize - 1)) == 0)' failed.

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messages: 355830
nosy: Dave Johansen
priority: normal
severity: normal
status: open
title: Crash when running SQLAlchemy with pyodbc
type: crash
versions: Python 3.7

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