[Bug 229167] [Hyper-V] [Jun 19, 2018] Recently FreeBSD VM panics during boot-up, especially with Mellanox VF configured

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229167

--- Comment #16 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Dexuan Cui from comment #15)
I also created a 11.1 VM from the MicrosoftOSTC:FreeBSD:11.1:latest image, and
updated it to 11.2 (11.2-RELEASE FreeBSD 11.2-RELEASE #0 r335510: Fri Jun 22
04:32:14 UTC 2018     root at releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
 amd64) and can't reproduce the issue: I have mlx4en_load="YES" in
/boot/loader.conf and the mlxen0 interface appears in "ifconfig" as expected.

According to the call-trace, the panic we previously saw happens in namei(),
which is in VFS code. So my feeling is: the file system may be somehow corrupt
or there is a race condition bug in the VFS code?

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