eb03a44325
During vnet cleanup vnet_if_uninit() checks that no more interfaces remain in the vnet. Any interface borrowed from another vnet is returned by vnet_if_return(). Other interfaces (i.e. cloned interfaces) should have been destroyed by their cloner at this point. The if_vlan VNET_SYSUNINIT had priority SI_ORDER_FIRST, which means it had equal priority as vnet_if_uninit(). In other words: it was possible for it to be called *after* vnet_if_uninit(), which would lead to assertion failures. Set the priority to SI_ORDER_ANY, like other cloners to ensure that vlan interfaces are destroyed before we enter vnet_if_uninit(). The sys/net/if_vlan test provoked this.
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