Re: PROBLEM: virtio_net LRO kernel panics

From: "Michael S. Tsirkin" <mst@redhat.com>
To: Ivan <ivan@prestigetransportation.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	virtualization@lists.linux-foundation.org,
	Willem de Bruijn <willemb@google.com>
Subject: Re: PROBLEM: virtio_net LRO kernel panics
Date: Fri, 23 Jul 2021 04:59:06 -0400	[thread overview]
Message-ID: <20210723045838-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CACFia2fYQG4Y3_ffym06C1HGrOiOS38YWxuoUu4HYorwS9qOjA@mail.gmail.com>

On Fri, Jul 23, 2021 at 03:31:02AM -0500, Ivan wrote:
> On Fri, Jul 23, 2021 at 2:59 AM Michael S. Tsirkin <mst@redhat.com> wrote:
> >
> > On Thu, Jul 22, 2021 at 11:50:11PM -0500, Ivan wrote:
> > > On Thu, Jul 22, 2021 at 11:25 PM Jason Wang <jasowang@redhat.com> wrote:
> > > > 在 2021/7/23 上午10:54, Ivan 写道:
> > > > > On Thu, Jul 22, 2021 at 9:37 PM Jason Wang <jasowang@redhat.com> wrote:
> > > > >> Does it work if you turn off lro before enabling the forwarding?
> > > > > 0 root@NuRaid:~# ethtool -K eth0 lro off
> > > > > Actual changes:
> > > > > rx-lro: on [requested off]
> > > > > Could not change any device features
> > > >
> > > > Ok, it looks like the device misses the VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
> > > > which makes it impossible to change the LRO setting.
> > > >
> > > > Did you use qemu? If yes, what's the qemu version you've used?
> > >
> > > These are VirtualBox machines, which I've been using for years with
> > > longterm kernels 4.19, and I never had such a problem.  But now that I
> > > tried upgrading to kernels 5.10 or 5.13 -- the panics started.  These
> > > are just generic kernel builds, and a minimalistic userspace.
> >
> > I would be useful to see the features your virtualbox instance provides
> >
> > cat /sys/class/net/eth0/device/features
> >
> > replacing eth0 with device name as appropriate
> 
> # grep . /sys/class/net/eth0/device/* 2>/dev/null
> /sys/class/net/eth0/device/device:0x0001
> /sys/class/net/eth0/device/
> features:1100010110111011111100000000000000000000000000000000000000000000
> /sys/class/net/eth0/device/modalias:virtio:d00000001v00001AF4
> /sys/class/net/eth0/device/status:0x00000007
> /sys/class/net/eth0/device/uevent:DRIVER=virtio_net
> /sys/class/net/eth0/device/uevent:MODALIAS=virtio:d00000001v00001AF4
> /sys/class/net/eth0/device/vendor:0x1af4
> 
> # lspci -vv -nn
> 00:03.0 Ethernet controller [0200]: Red Hat, Inc. Virtio network device
> [1af4:1000]
>         Subsystem: Red Hat, Inc. Virtio network device [1af4:0001]
>         Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B- DisINTx-
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
> <MAbort- >SERR- <PERR- INTx-
>         Latency: 64
>         Interrupt: pin A routed to IRQ 19
>         Region 0: I/O ports at d000 [size=32]
>         Capabilities: [80] Null
>         Kernel driver in use: virtio-pci
>         Kernel modules: virtio_pci
> 

Disabling guest offloads reproduces the warning, but not the crash
for me.

-- 
MST

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