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Date:      Sun, 17 Nov 2019 08:18:03 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 242023] bhyve pci_vtnet_rx broken after r354552
Message-ID:  <bug-242023-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D242023

            Bug ID: 242023
           Summary: bhyve pci_vtnet_rx broken after r354552
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bhyve
          Assignee: virtualization@FreeBSD.org
          Reporter: woodsb02@freebsd.org

I am running FreeBSD 13-CURRENT r354563, and when I boot my Windows 10 VM g=
uest
it is crashing after ~5 seconds with the following error printed to the
console:

Assertion failed: (iov[0].iov_len >=3D sizeof(*hdr)), function pci_vtnet_rx=
, file
/usr/src/usr.sbin/bhyve/pci_virtio_net.c, line 272.

This appears that it could be a result of the recent change r354552 "bhyve:=
 add
support for virtio-net mergeable rx buffers", as it added the line of code
referenced in the above error:
https://svnweb.freebsd.org/base?view=3Drevision&revision=3D354552

The other thing that could be relevant is that this VM was recently upgrade=
d to
Windows 10 version 1909. However, given the code that is crashing was only
added to head 8 days ago, that is my first guess at where the issue is.

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