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

[Yangming]

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 3^rd 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.

 

Kind regards.

 

0001-net-net.c-do-not-assert-nc-as-hotplug-vhost-net-may-.patch
Description: 0001-net-net.c-do-not-assert-nc-as-hotplug-vhost-net-may-.patch