[Bug 295870] [tcp] page fault in tcp_default_output in response to TCP input

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295870

--- Comment #8 from Kajetan Staszkiewicz <[email protected]> ---
Gleb Smirnoff wrote:

> satanist reports that his panic is associated with interface departure.
Kajetan, is your crash associated with interface departure or not?

"departure", as in interface being shut down or removed? No, this happened on a
router, all its interfaces are permanent.

Gleb Smirnoff wrote:

> Is it possible to run with INVARIANTS for a while to get a crash?

I have DEBUG kernels running on a few machines, but the issue has never
happened there. And this is not something I know how to trigger, it only
happened on 2 15.0 hosts so far. Let me check if only having INVARIANTS cause
noticeable performance degradation first.

Michael Tuexen wrote:

> Is the bug somewhat reproducible?

I don't think so. And the machines mostly route and firewall (pf) the traffic,
there's very few services running on them.

> Would you be willing to enable BlackBox Logging? You can find instructions at: https://wiki.freebsd.org/MichaelTuexen

I'll give it a try.

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