[New-bugs-announce] [issue26463] asyncio-related (?) segmentation fault

Nicholas Chammas report at bugs.python.org
Mon Feb 29 21:50:54 EST 2016

New submission from Nicholas Chammas:

Python 3.5.1, OS X 10.11.3.

I have an application that uses asyncio and Cryptography (via the AsyncSSH library). Cryptography has some parts written in C, I believe.

I'm testing my application by sending a keyboard interrupt while 2 tasks are working. My application doesn't clean up after itself correctly, so I get these warnings about pending tasks being destroyed, but I don't think I should ever be getting segfaults. I am able to consistently get this segfault by interrupting my application at roughly the same point.

I'm frankly intimidated by the segfault (it's been many years since I dug into one), but the most likely culprits are either Python or Cryptography since they're the only components of my application that have parts written in C, as far as I know.

I'm willing to help boil this down to something more minimal with some help. Right now I just have the repro at this branch of my application (which isn't too helpful for people other than myself): 


Basically, launch a cluster on EC2, and as soon as one task reports that SSH is online, interrupt Flintrock with Control + C. You'll get this segfault.

components: Macintosh, asyncio
files: segfault.txt
messages: 261036
nosy: Nicholas Chammas, gvanrossum, haypo, ned.deily, ronaldoussoren, yselivanov
priority: normal
severity: normal
status: open
title: asyncio-related (?) segmentation fault
type: crash
versions: Python 3.5
Added file: http://bugs.python.org/file42051/segfault.txt

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