I've been using Vbox on FreeBSD since it's been available. I'm seeing 2 major problems now. 1. Over the last several months I have had instability causing the machine to lock up and requiring a hardware/power reset. This occurs approx every 7-10 days (sometimes sooner). I made the following changes but it did not fix the problem, only increased the length of time between freezes. vfs.aio.max_buf_aio=8192 vfs.aio.max_aio_queue_per_proc=65536 vfs.aio.max_aio_per_proc=8192 vfs.aio.max_aio_queue=65536 2. Very recently (last several days) the mouse has stopped working in the guest several minutes after bootup. I recompiled/installed VBox and VBox-kmod, but it didn't have any effect. This is on a 12-current machine, with all source and ports synched and updated. Guest is Opensuse Tumbleweed. FreeBSD 12.0-CURRENT #44 r335389: Tue Jun 19 19:26:45 EDT 2018 Jun 19 20:01:26 BSD_12 kernel: root@BSD_12:/usr/obj/usr/src/amd64.amd64/sys/MYKERNEL amd64 Jun 19 20:01:26 BSD_12 kernel: FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM 6.0.0) Jun 19 20:01:26 BSD_12 kernel: VT(vga): resolution 640x480 Jun 19 20:01:26 BSD_12 kernel: CPU: AMD Ryzen 7 1800X Eight-Core Processor (3600.10-MHz K8-class CPU) Jun 19 20:01:26 BSD_12 kernel: Origin="AuthenticAMD" Id=0x800f11 Family=0x17 Model=0x1 Stepping=1 Jun 19 20:01:26 BSD_12 kernel: 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> Jun 19 20:01:26 BSD_12 kernel: Features2=0x7ed8320b<SSE3,PCLMULQDQ,MON,SSSE3,FMA,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> Jun 19 20:01:26 BSD_12 kernel: AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM> Jun 19 20:01:26 BSD_12 kernel: AMD Features2=0x35c233ff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,SKINIT,WDT,TCE,Topology,PCXC,PNXC,DBE,PL2I,MWAITX> Jun 19 20:01:26 BSD_12 kernel: Structured Extended Features=0x209c01a9<FSGSBASE,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,CLFLUSHOPT,SHA> Jun 19 20:01:26 BSD_12 kernel: XSAVE Features=0xf<XSAVEOPT,XSAVEC,XINUSE,XSAVES> Jun 19 20:01:26 BSD_12 kernel: AMD Extended Feature Extensions ID EBX=0x7<CLZERO,IRPerf,XSaveErPtr> Jun 19 20:01:26 BSD_12 kernel: SVM: NP,NRIP,VClean,AFlush,DAssist,NAsids=32768 Jun 19 20:01:26 BSD_12 kernel: TSC: P-state invariant, performance statistics Jun 19 20:01:26 BSD_12 kernel: real memory = 17179869184 (16384 MB)