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

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254695

--- Comment #9 from Gordon Bergling <gbe at FreeBSD.org> ---
(In reply to Wei Hu from comment #8)

Thanks for the investigation. I was able to boot a kernel from today (15 April)
on this machine. I tracked the issue down to the tcp_bbr or cc_htcp. I build
the system with WITH_EXTRA_TCP_STACKS=1 and have

tcp_bbr_load="YES"
cc_htcp_load="YES"

in /boot/loader.conf

and

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

in /etc/sysctl.conf.

I first disabled the sysctl.conf settings and the panic is still happening. So
it is enough to load the modules at boot time. If I disable both modules the
system is starting as usual. If one of these modules is loaded at boot time,
the system panics. Maybe it is something locking related.

Hope that helps to track down that issue.

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