[Bug 219846] [panic] [kevent] mutex nm_kn_lock not owned, netmap with INVARIANTS+WITNESS

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219846

--- Comment #8 from Harald Schmalzbauer <bugzilla.freebsd at omnilan.de> ---
Just a quick note that I'm unfortunately busy with completely different things
:-(
And for the records, here's Vincenzo's approach which I usesd (successfully as
far as I remember) back in 11.2:
+++ src/sys/dev/netmap/netmap_freebsd.c 2017-06-17 11:22:53.685116000 +0200
@@ -1374,7 +1374,7 @@
        kn->kn_fop = (ev == EVFILT_WRITE) ?
                &netmap_wfiltops : &netmap_rfiltops;
        kn->kn_hook = priv;
-       knlist_add(&si->si.si_note, kn, 1);
+       knlist_add(&si->si.si_note, kn, 0);
        // XXX unlock(priv)
        ND("register %p %s td %p priv %p kn %p np_nifp %p kn_fp/fpop %s",
                na, na->ifp->if_xname, curthread, priv, kn,

No skills to contribute and no time to test at the moment, sorry.

Thanks for taking care, will get back to it :-)

-harry

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