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vlan: Fix panic when vnet jail with a vlan interface is destroyed

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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.
This commit is contained in:
Kristof Provost 2020-01-31 22:54:44 +00:00
parent 915c367e8e
commit eb03a44325
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357356
1 changed files with 1 additions and 1 deletions
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2
sys/net/if_vlan.c
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@ -921,7 +921,7 @@ vnet_vlan_uninit(const void *unused __unused)
if_clone_detach(V_vlan_cloner);
}
VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_INIT_IF, SI_ORDER_FIRST,
VNET_SYSUNINIT(vnet_vlan_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
vnet_vlan_uninit, NULL);
#endif