[Bug 237124] [xen] Crash or freeze during boot with multiple network interfaces in HVM mode with i386 kernel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237124

            Bug ID: 237124
           Summary: [xen] Crash or freeze during boot with multiple
                    network interfaces in HVM mode with i386 kernel
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsdbugs at linuxhosted.ca

While attempting to migrate some virtual machines from a Xen 3.4 host to Xen
4.8 host (both Linux), we discovered that some FreeBSD domU vms were either
freezing or crashing during boot, once on the Xen 4.8 host.

After a bit of investigation it was determined that the same issue was causing
both the crashes and freezes. In each case, the last kernel message seen would
be:
xn0: backend features: feature-sg feature-gso-tcp4

After some more investigation, it was determined that booting with only 1
network interface worked fine (the problem VMs have 2 interfaces), and that the
problem only seems to exist with the i386 kernels. I tried various versions of
11.0, 11.1, 11.2, and 12.0 RELEASE kernels, the only ones that would work with
more than 1 network interface are the amd64 kernels.

So to summarize, to reproduce the bug:
Xen 4.8 host dom0
HVM domU VM with multiple network interfaces
Boot FreeBSD i386 kernel (even just booting from a FreeBSD iso encounters the
bug)


Below is the VM's xen config file:
name = "FreeBSD-test"
maxmem = "1024"
memory = "1024"
vcpus = "2"
builder = "hvm"
kernel = "/usr/lib/xen/boot/hvmloader"
device_model_version = "qemu-xen-traditional"
device_model_override = "/usr/lib64/xen/bin/qemu-dm"
xen_platform_pci = "1"
boot = "d"
pae = "1"
acpi = "1"
apic = "1"
localtime = "0"
on_poweroff = "destroy"
on_reboot = "destroy"
on_crash = "destroy"
sdl = "0"
serial = "pty"
vnc = 1
vnclisten = "0.0.0.0"
vncconsole = 0
vncunused = 0
vncdisplay = 1
shadow_memory = "8"
disk = [ "file:/vms/FreeBSD-test.img,hda,w",
"file:/iso/FreeBSD-12.0-RELEASE-i386-disc1.iso,hdc,r,devtype=cdrom"   ]
vif = [ "mac=00:16:3e:00:3d:42,bridge=xenbr0,model=e1000",
"mac=00:16:3e:00:3e:42,bridge=xenbr1,model=e1000" ]
cpu_weight = "1024"

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