[Bug 230845] VIMAGE regression: breaks netfront suspend/resume

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230845

Kristof Provost <kp at freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kp at freebsd.org

--- Comment #1 from Kristof Provost <kp at freebsd.org> ---
This likely means you wound up calling arp_ifnet() without a curvnet set.
That's important context for basically all networking operations, but it's not
going to be set when called from a kernel thread, as appears to be the case
here.

Usually all you have to do is ensure that the correct vnet is set.

This is untested (and may not even compile), but might fix it:

diff --git a/sys/dev/xen/netfront/netfront.c b/sys/dev/xen/netfront/netfront.c
index ba8ac3caf7f..12938354f9c 100644
--- a/sys/dev/xen/netfront/netfront.c
+++ b/sys/dev/xen/netfront/netfront.c
@@ -962,6 +962,8 @@ netfront_backend_changed(device_t dev, XenbusState
newstate)

        DPRINTK("newstate=%d\n", newstate);

+       CURVNET_SET(sc->xn_ifp->vnet);
+
        switch (newstate) {
        case XenbusStateInitialising:
        case XenbusStateInitialised:
@@ -994,6 +996,8 @@ netfront_backend_changed(device_t dev, XenbusState
newstate)
 #endif
                break;
        }
+
+       CURVNET_RESTORE();
 }

 /**

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