----- Original Message -----
> From: Yunjian Wang <wangyunj...@huawei.com>
>
> "nc" is freed after hotplug vhost-user, but the watcher is not removed.
> The QEMU crash when the watcher access the "nc" when socket disconnects.
>
> Program received signal SIGSEGV, Segmentation fault.
> #0 object_get_class (obj=obj@entry=0x2) at qom/object.c:750
> #1 0x00007f9bb4180da1 in qemu_chr_fe_disconnect (be=<optimized out>) at
> chardev/char-fe.c:372
> #2 0x00007f9bb40d1100 in net_vhost_user_watch (chan=<optimized out>,
> cond=<optimized out>, opaque=<optimized out>) at net/vhost-user.c:188
> #3 0x00007f9baf97f99a in g_main_context_dispatch () from
> /usr/lib64/libglib-2.0.so.0
> #4 0x00007f9bb41d7ebc in glib_pollfds_poll () at util/main-loop.c:213
> #5 os_host_main_loop_wait (timeout=<optimized out>) at
> util/main-loop.c:261
> #6 main_loop_wait (nonblocking=nonblocking@entry=0) at
> util/main-loop.c:515
> #7 0x00007f9bb3e266a7 in main_loop () at vl.c:1917
> #8 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized
> out>) at vl.c:4786
>
> Signed-off-by: Yunjian Wang <wangyunj...@huawei.com>
Reviewed-by: Marc-André Lureau <marcandre.lur...@redhat.com>
> ---
> v3:
> -fix conflicts with current master.
>
> v2:
> -move the chunk before deinit.
>
> ps:
> reproduce steps:
> 1. virsh attach-device vm0 vhost-user.xml
> 2. virsh detach-device vm0 vhost-user.xml
> 3. virsh attach-device vm0 vhost-user.xml
> 4. service openvswitch restart
> 5. repeat step 2~4
>
> the vhost-user xml:
> <interface type='vhostuser'>
> <mac address='00:01:01:00:10:41'/>
> <source type='unix' path='/var/run/vhost-user/tap1' mode='client'/>
> <model type='virtio'/>
> <driver queues='8'/>
> </interface>
> ---
> net/vhost-user.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/net/vhost-user.c b/net/vhost-user.c
> index 36f32a2..c23927c 100644
> --- a/net/vhost-user.c
> +++ b/net/vhost-user.c
> @@ -151,6 +151,10 @@ static void vhost_user_cleanup(NetClientState *nc)
> s->vhost_net = NULL;
> }
> if (nc->queue_index == 0) {
> + if (s->watch) {
> + g_source_remove(s->watch);
> + s->watch = 0;
> + }
> qemu_chr_fe_deinit(&s->chr, true);
> }
>
> --
> 1.8.3.1
>
>
>
