netdev - Re: [REGRESSION] [PATCH v2] net: missing check virtio

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACGkMEvpB0zP+okrst-_mAxKq2eVwpdxQ5WTA07FBzRrs3uGaA@mail.gmail.com>
Date: Mon, 5 Aug 2024 14:17:34 +0800
From: Jason Wang <jasowang@...hat.com>
To: Blake Sperling <breakingspell@...il.com>
Cc: arefev@...mel.ru, edumazet@...gle.com, eperezma@...hat.com, 
	linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org, mst@...hat.com, 
	netdev@...r.kernel.org, virtualization@...ts.linux.dev, 
	xuanzhuo@...ux.alibaba.com, stable@...r.kernel.org, 
	regressions@...ts.linux.dev, 
	Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [REGRESSION] [PATCH v2] net: missing check virtio

On Mon, Aug 5, 2024 at 2:10 PM Blake Sperling <breakingspell@...il.com> wrote:
>
> Hello, I noticed a regression from v.6.6.43 to v6.6.44 caused by this commit.
>
> When using virtio NIC with a QEMU/KVM Windows guest, network traffic from the VM stalls in the outbound (upload) direction.This affects remote access and file shares most noticeably, and the inbound (download) direction does not have the issue.
>
> iperf3 will show consistent results, 0 bytes/sec when initiating a test within the guest to a server on LAN, and reverse will be full speed. Nothing out of the ordinary in host dmesg or guest Event Viewer while the behavior is being displayed.
>
> Crucially, this only seems to affect Windows guests, Ubuntu guest with the same NIC configuration tests fine both directions.
> I wonder if NetKVM guest drivers may be related, the current latest version of the drivers (v248) did not make a difference, but it is several months old.
>
> Let me know if there are any further tests or info I can provide, thanks!

Does Willem's patch fix the issue?

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=89add40066f9ed9abe5f7f886fe5789ff7e0c50e

Thanks