netdev - Re: Linux 4.14 - regression: broken tun/tap / bridge network with virtio

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Message-ID: <4efbaf24-f419-2c8e-c705-59a5242b0575@01019freenet.de>
Date:   Sun, 3 Dec 2017 12:35:52 +0100
From:   Andreas Hartmann <andihartmann@...19freenet.de>
To:     netdev@...r.kernel.org
Cc:     john.fastabend@...il.com, Michal Kubecek <mkubecek@...e.cz>
Subject: Re: Linux 4.14 - regression: broken tun/tap / bridge network with
 virtio - bisected

On 12/01/2017 at 11:11 AM Andreas Hartmann wrote:
> Hello!
> 
> I hopefully could get rid of both of my problems (hanging network w/
> virtio) and endless hanging qemu-process on VM shutdown by upgrading
> qemu from 2.6.2 to 2.10.1. I hope it will persist.

It didn't persist. 10h later - same problems happened again. It's just
much harder to trigger the problems.

I'm now trying it with

CONFIG_RCU_NOCB_CPU=y and
rcu_nocbs=0-15

Since then, I didn't see any problem any more. But this doesn't mean
anything until now ... .


Regards,
Andreas