Host machines reboots when running bhyve VM

I recently upgraded to r351575 and now when I run a Bhyve VM, the host
machine instantly reboots. The command-line I'm running is:


bhyve -c 2 -m 8G -w -H -s 0,hostbridge -s
4,virtio-blk,/home/bcran/cube/opensuse-jenkins-node.img -s
15,virtio-net,tap0 -s 28,virtio-rnd -s
29,fbuf,tcp=0.0.0.0:5900,w=1024,h=768 -s 31,lpc -l com1,stdio -l
bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd vm0

And the system (I've tried both GENERIC-NODEBUG and GENERIC) is:


FreeBSD 13.0-CURRENT r351575 GENERIC-NODEBUG amd64
FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on
LLVM 8.0.1)
VT(efifb): resolution 1024x768
CPU: AMD Ryzen Threadripper 2990WX 32-Core Processor (2994.44-MHz
K8-class CPU)
  Origin="AuthenticAMD"  Id=0x800f82  Family=0x17  Model=0x8  Stepping=2
 
Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
 
Features2=0x7ed8320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
  AMD
Features2=0x35c233ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,SKINIT,WDT,TCE,Topology,PCXC,PNXC,DBE,PL2I,MWAITX>
  Structured Extended
Features=0x209c01a9<FSGSBASE,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,CLFLUSHOPT,SHA>
  XSAVE Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES>
  AMD Extended Feature Extensions ID
EBX=0x1007<CLZERO,IRPerf,XSaveErPtr,IBPB>
  SVM: NP,NRIP,VClean,AFlush,DAssist,NAsids=32768
  TSC: P-state invariant, performance statistics
real memory  = 137438953472 (131072 MB)
avail memory = 133601013760 (127411 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <AMD A M I >
FreeBSD/SMP: Multiprocessor System Detected: 64 CPUs
FreeBSD/SMP: 1 package(s) x 4 groups x 2 cache groups x 4 core(s) x 2
hardware threads


-- 

Rebecca Cran