[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, 14 Jul 2021 13:37:53 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254695

--- Comment #24 from Gordon Bergling <gbe@FreeBSD.org> ---
(In reply to Michael Tuexen from comment #22)

With your patch applied the panic is gone.

I tested the following scenarios:

a) booting the default network stack and manually loading tcp_bbr and tcp_rack
b) loading the modules at boot time via /boot/loader.conf, but leaving the
default network stack active
c) loading the modules at boot time via /boot/loader.conf and activating the
stack via /etc/sysctl.conf

net.inet.tcp.cc.algorithm=htcp
net.inet.tcp.functions_default=bbr

Thanks for the patch!

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