https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292162

Kristof Provost <[email protected]> changed:

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--- Comment #4 from Kristof Provost <[email protected]> ---
I believe this is the same issue as #279653 and #291003.

We've also seen it on pfsense (https://redmine.pfsense.org/issues/14431). I
believe the first reports there started about two years ago. At the time I
stuck this workaround in the pfsense tree:
https://github.com/pfsense/FreeBSD-src/commit/9834d8bb0d3344cd82552c3cd16e5b2d84543d8f
(That's very much a workaround and not a fix, but it does seem to have greatly
reduced the impact for pfsense users)

My suspicion is that it's a race around interface destruction, where we somehow
still end up getting a route from fib6_lookup() on an interface that no longer
has afdata for AF_INET6, but I never worked out how we could end up in that
state.

We also never managed to get a reliable reproduction scenario. If Justin can
reproduce this it'll be important progress.

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