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Date:      Wed, 14 Jul 2021 13:37:53 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 254695] Hyper-V + TCP_BBR: Kernel Panic: Assertion in_epoch(net_epoch_preempt) failed at netinet/tcp_lro.c:915
Message-ID:  <bug-254695-27103-t52Dvg4ADJ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-254695-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-254695-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D254695

--- 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_r=
ack
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=3Dhtcp
net.inet.tcp.functions_default=3Dbbr

Thanks for the patch!

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