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

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Date:   Mon, 4 Dec 2017 17:28:00 +0100
From:   Andreas Hartmann <andihartmann@...19freenet.de>
To:     Andreas Hartmann <andihartmann@...19freenet.de>,
        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 12/03/2017 at 12:35 PM Andreas Hartmann wrote:
> 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 ... .

Didn't work ether. Disabling vhost_net's zcopy hadn't any effect, too.

=> It's just finally broken since

2ddf71e23cc246e95af72a6deed67b4a50a7b81c
net: add notifier hooks for devmap bpf map

Here is the same problem:
https://bugzilla.kernel.org/show_bug.cgi?id=197861

Any idea how to proceed?


Thanks,
Andreas