TinyVisor 1.7 で再現評価したところ、同様の問題が発生しました。
TinyVisor 1.7 リリース時は、 FreeBSD 10.2 で同様の評価を行いましたが、同様の問題は発生しませんでした。
FreeBSD のリビジョンの違いで問題が顕在化した可能性があります。
VM0のOSの起動を抑止した場合、FreeBSD 10.3 の起動に成功しますが、 kbd0 at atkbd0 のあとは、キーボードコントローラ初期化のエラーメッセージがでていました。
kbd0 at atkbd0 atkbd0: [GIANT-LOCKED] psm: keyboard controller failed.
キーボードコントローラはエミュレートしていないので、期待動作だと思います。
VM0 も平行に起動した時に、どうしてこの動作にならないのかが疑問です。
VM1 の OS が IO port 0x64 (KBD CMD) を読み込んだ時に VMM が不定値を返却していました。
47e4b09 で修正したところ、ストールしなくなりました。
Fork
FreeBSD 10.3をVM1で起動すると、起動の途中でストールします。
VM0のOSが起動しないようにすると、VM1のFreeBSDは起動します。
Copyright (c) 1992-2013 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 9.2-RELEASE #0 r255898: Thu Sep 26 22:50:31 UTC 2013 root@bake.isc.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64 gcc version 4.2.1 20070831 patched [FreeBSD] CPU: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz (3808.07-MHz K8-class CPU) Origin = "GenuineIntel" Id = 0x306a9 Family = 0x6 Model = 0x3a Stepping = 9 Features=0xbfe3fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0x7798e3df<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,TSCDLT,AESNI,XSAVE,AVX,F16C,RDRAND> AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM> AMD Features2=0x1<LAHF> Standard Extended Features=0x281<GSFSBASE,SMEP,ENHMOVSB> TSC: P-state invariant, performance statistics real memory = 5722079232 (5457 MB) avail memory = 5460000768 (5207 MB) Event timer "LAPIC" quality 600 ACPI APIC Table: <BOCHS BXPCAPIC> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs FreeBSD/SMP: 1 package(s) x 2 core(s) cpu0 (BSP): APIC ID: 4 cpu1 (AP): APIC ID: 6 ioapic0 <Version 1.1> irqs 0-23 on motherboard kbd1 at kbdmux0 module_register_init: MOD_LOAD (vesa, 0xffffffff80d11010, 0) error 19 acpi0: <BOCHS BXPCRSDT> on motherboard acpi0: Power Button (fixed) cpu0: <ACPI CPU> on acpi0 cpu1: <ACPI CPU> on acpi0 atrtc0: <AT realtime clock> port 0x70-0x71,0x72-0x77 irq 8 on acpi0 Event timer "RTC" frequency 32768 Hz quality 0 hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0 Timecounter "HPET" frequency 14318180 Hz quality 950 Event timer "HPET" frequency 14318180 Hz quality 550 Event timer "HPET1" frequency 14318180 Hz quality 440 Event timer "HPET2" frequency 14318180 Hz quality 440 Event timer "HPET3" frequency 14318180 Hz quality 440 Event timer "HPET4" frequency 14318180 Hz quality 440 Event timer "HPET5" frequency 14318180 Hz quality 440 Event timer "HPET6" frequency 14318180 Hz quality 440 Timecounter "ACPI-safe" frequency 3579545 Hz quality 850 acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0 pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0 pci0: <ACPI PCI bus> on pcib0 pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0 pci1: <ACPI PCI bus> on pcib1 vgapci0: <VGA-compatible display> port 0xe000-0xe07f mem 0xf6000000-0xf6ffffff,0xe0000000-0xefffffff,0xf4000000-0xf5ffffff at device 0.0 on pci1 xhci0: <Intel Panther Point USB 3.0 controller> mem 0xf7900000-0xf790ffff at device 20.0 on pci0 xhci0: 32 byte context size. usbus0 on xhci0 pcib2: <ACPI PCI-PCI bridge> at device 28.0 on pci0 pci2: <ACPI PCI bus> on pcib2 ahci0: <Marvell 88SE912x AHCI SATA controller> port 0xd040-0xd047,0xd030-0xd033,0xd020-0xd027,0xd010-0xd013,0xd000-0xd00f mem 0xf7810000-0xf78107ff at device 0.0 on pci2 ahci0: AHCI v1.20 with 8 6Gbps ports, Port Multiplier not supported ahci0: quirks=0x800<ALTSIG> ahcich0: <AHCI channel> at channel 0 on ahci0 ahcich1: <AHCI channel> at channel 1 on ahci0 ahcich2: <AHCI channel> at channel 2 on ahci0 ahcich3: <AHCI channel> at channel 3 on ahci0 ahcich4: <AHCI channel> at channel 4 on ahci0 ahcich5: <AHCI channel> at channel 5 on ahci0 ahcich6: <AHCI channel> at channel 6 on ahci0 ahcich7: <AHCI channel> at channel 7 on ahci0 pcib3: <PCI-PCI bridge> at device 28.5 on pci0 pci5: <PCI bus> on pcib3 re0: <RealTek 8168/8111 B/C/CP/D/DP/E/F PCIe Gigabit Ethernet> port 0xc000-0xc0ff mem 0xf0004000-0xf0004fff,0xf0000000-0xf0003fff at device 0.0 on pci5 re0: Using 1 MSI-X message re0: Chip rev. 0x2c800000 re0: MAC rev. 0x00000000 miibus0: <MII bus> on re0 rgephy0: <RTL8169S/8110S/8211 1000BASE-T media interface> PHY 1 on miibus0 rgephy0: none, 10baseT, 10baseT-FDX, 10baseT-FDX-flow, 100baseTX, 100baseTX-FDX, 100baseTX-FDX-flow, 1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, 1000baseT-FDX-flow, 1000baseT-FDX-flow-master, auto, auto-flow re0: Ethernet address: bc:5f:f4:97:58:96 atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0 atkbd0: <AT Keyboard> irq 1 on atkbdc0 kbd0 at atkbd0障害発生リビジョン: 75f269f