https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195537

            Bug ID: 195537
           Summary: [xen] vt console somehow causes failures to boot and
                    disk errors
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-xen@FreeBSD.org
          Reporter: sbr...@freebsd.org

I'm scratching my head on this one.  

Running 11-current from today (svn r275291) with defaults will fail to boot on
my rootbsd Xen HVM instance.  It will have intermittent vnc consoles and will
exhibit numerous disk errors when trying to boot multiuser or doing an
installworld from single user.

If I set kern.vty="sc" in loader.conf, magically all of these problems go away.

I am using rootbsd's xen infrastructure for this:

Nov 29 11:49:57 box kernel: FreeBSD clang version 3.4.1
(tags/RELEASE_34/dot1-final 208032) 20140512
Nov 29 11:49:57 box kernel: XEN: Hypervisor version 4.2 detected.
Nov 29 11:49:57 box kernel: CPU: Intel(R) Xeon(R) CPU           E5620  @
2.40GHz (2400.05-MHz K8-class CPU)
Nov 29 11:49:57 box kernel: Origin="GenuineIntel"  Id=0x206c2  Family=0x6 
Model=0x2c  Stepping=2
Nov 29 11:49:57 box kernel:
Features=0x1783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
Nov 29 11:49:57 box kernel:
Features2=0x81ba2201<SSE3,SSSE3,CX16,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,HV>
Nov 29 11:49:57 box kernel: AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
Nov 29 11:49:57 box kernel: AMD Features2=0x1<LAHF>
Nov 29 11:49:57 box kernel: Hypervisor: Origin = "XenVMMXenVMM"
Nov 29 11:49:57 box kernel: real memory  = 1434451968 (1368 MB)
Nov 29 11:49:57 box kernel: avail memory = 1353445376 (1290 MB)
Nov 29 11:49:57 box kernel: Event timer "LAPIC" quality 400
Nov 29 11:49:57 box kernel: ACPI APIC Table: <Xen HVM>
Nov 29 11:49:57 box kernel: FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
Nov 29 11:49:57 box kernel: FreeBSD/SMP: 1 package(s) x 2 core(s)
Nov 29 11:49:57 box kernel: cpu0 (BSP): APIC ID:  0
Nov 29 11:49:57 box kernel: cpu1 (AP): APIC ID:  2
Nov 29 11:49:57 box kernel: ioapic0: Changing APIC ID to 1
Nov 29 11:49:57 box kernel: MADT: Forcing active-low polarity and level trigger
for SCI
Nov 29 11:49:57 box kernel: ioapic0 <Version 1.1> irqs 0-47 on motherboard
Nov 29 11:49:57 box kernel: random: entropy device infrastructure driver
Nov 29 11:49:57 box kernel: random: selecting highest priority adaptor <Dummy>
Nov 29 11:49:57 box kernel: random: SOFT: yarrow init()
Nov 29 11:49:57 box kernel: random: selecting highest priority adaptor <Yarrow>
Nov 29 11:49:57 box kernel: kbd1 at kbdmux0
Nov 29 11:49:57 box kernel: xenpv0: <Xen PV bus> on motherboard
Nov 29 11:49:57 box kernel: xen_et0: <Xen PV Clock> on xenpv0
Nov 29 11:49:57 box kernel: Event timer "XENTIMER" frequency 1000000000 Hz
quality 950
Nov 29 11:49:57 box kernel: Timecounter "XENTIMER" frequency 1000000000 Hz
quality 950
Nov 29 11:49:57 box kernel: xenstore0: <XenStore> on xenpv0

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