Re: [PATCH] net: Fix qemu crash when hot-pluging a vhost-net failed.

[Philippe Mathieu-Daudé]

On 5/12/22 07:37, Jason Wang wrote:
> On Mon, Dec 5, 2022 at 2:23 PM Yangming <yangming73@huawei.com> wrote:
> > Dear all:
> >
> >
> >
> > I found a bug of qemu: hot-pluging a vhost-net may cause virtual machine crash 
> > in following steps:
> > 1. Starting a vm without any net device.
> > 2. Hot-pluging 70 memory devices.
> > 3. Hot-pluging a vhost-net device.
> >
> >
> >
> > After the 3rd step, the qemu crashed with following messages:
> >
> >
> >
> > vhost backend memory slots limit is less than current number of present memory 
> > slots
> >
> > warning: vhost-net requested but could not be initialized
> >
> > qemu-system-x86_64: ../net/net.c:1106: net_client_init1: Assertion `nc' failed.
> >
> > 2022-12-05 03:14:08.794+0000: shutting down, reason=crashed
> >
> >
> >
> > This commit is used to fix the mentioned problem. It is based on commit 
> > a33c25399f9bc3dcf83064adeba2a82e61bf4608 of master branch.
>
> Thanks for the patch, would you please send a formal patch (not as an
> attachment), you can do it via git-send-email.

You can find some help on how to proceed here:
https://www.qemu.org/docs/master/devel/submitting-a-patch.html