[Bug 254695] Hyper-V + TCP_BBR: Kernel Panic: Assertion in_epoch(net_epoch_preempt) failed at netinet/tcp_lro.c:915

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 07 Jul 2021 15:17:10 UTC

Gordon Bergling <gbe@FreeBSD.org> changed:

           What    |Removed                     |Added
             Status|New                         |In Progress

--- Comment #11 from Gordon Bergling <gbe@FreeBSD.org> ---
(In reply to Wei Hu from comment #10)

Sorry for the late reply. I was running TCP BBR on Hyper-V since January 2020
without seeing any problems. Around the mid of march 2021 there must be a
commit that hit the tree, which leads to the panic. I had tried to bisect the
problem, but compiling an older version of -CURRENT on a recent one leads to
obscure clang error messages.

I tried a fresh build from todays sources without loading any additional TCP
stack at boot time and the panic is still present for both TCP BBR and TCP
RACK. Triggered by a simple 'kldload $module'.

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