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Date:      Fri, 20 Jul 2012 22:37:29 -0400
From:      Richard Yao <ryao@gentoo.org>
To:        Konstantin Belousov <kostikbel@gmail.com>
Cc:        stable@freebsd.org
Subject:   Re: FreeBSD 9.1 Beta 1 fails to install in qemu-kvm on Gentoo Linux
Message-ID:  <500A15E9.3080108@gentoo.org>
In-Reply-To: <20120721005610.GW2676@deviant.kiev.zoral.com.ua>
References:  <5009DA78.5070709@gentoo.org> <5009FA7E.6020601@gentoo.org> <20120721005610.GW2676@deviant.kiev.zoral.com.ua>

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On 07/20/2012 08:56 PM, Konstantin Belousov wrote:
> On Fri, Jul 20, 2012 at 08:40:30PM -0400, Richard Yao wrote:
>> On 07/20/2012 06:23 PM, Richard Yao wrote:
>>> Dear FreeBSD Developers,
>>>
>>> Trying to install FreeBSD 9.1 Beta 1 in qemu-kvm on Gentoo Linux fail=
s
>>> before the kernel dmesg with 'kernel trap 9 with interrupts disabled'=
=2E I
>>> am running the following command:
>>>
>>> qemu-system-x86_64 -drive
>>> file=3D/dev/zvol/rpool/KVM/freebsd,if=3Dscsi-bootorder=3Dc
>>> -cdrom/mnt/backup/isos/FreeBSD-9.1-BETA1-amd64-disc1.iso -m2048 -smp
>>> 6,cores=3D6,threads=3D1,sockets=3D1 -curses -net
>>> nic,model=3De1000,macaddr=3D52:54:00:00:ee:04 -cpu host
>>>
>>> If I use FreeBSD-9.0-RELEASE-amd64-dvd1.iso, I can do an install with=
out
>>> any problems.
>>>
>>> Yours truly,
>>> Richard Yao
>>>
>>
>> I have an update.
>>
>> 1. There is no backtrace. The only thing that I see printed after the
>> boot screen with beastie is a single line:
>>
>> 'kernel trap 9 with interrupts disabled'
> This line is probably printed after the banner and might be CPU feature=
s
> line. Is this true ? If so, show it.

I do not know what the banner is. However, that line is printed
immediately after the boot2 menu with Beastie. It occurs when I would
expect to see "Copyright (c) 1992-2012 The FreeBSD Project.". I see no
other visible characters aside from those from the boot2 menu with Beasti=
e.

>=20
>>
>> 2. Verbose mode does not change it.
>>
>> 3. Removing `-cpu host` fixes it. Here is an excerpt of the host's
>> /proc/cpuinfo:
>>
>> processor       : 0
>> vendor_id       : AuthenticAMD
>> cpu family      : 16
>> model           : 10
>> model name      : AMD Phenom(tm) II X6 1090T Processor
>> stepping        : 0
>> microcode       : 0x10000dc
>> cpu MHz         : 1600.000
>> cache size      : 512 KB
>> physical id     : 0
>> siblings        : 6
>> core id         : 0
>> cpu cores       : 6
>> apicid          : 0
>> initial apicid  : 0
>> fpu             : yes
>> fpu_exception   : yes
>> cpuid level     : 6
>> wp              : yes
>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge=

>> mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext
>> fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl
>> nonstop_tsc extd_apicid aperfmperf pni monitor cx16 popcnt lahf_l
>> m cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetc=
h
>> osvw ibs skinit wdt cpb npt lbrv svm_lock nrip_save pausefilter
>> bogomips        : 6421.39
>> TLB size        : 1024 4K pages
>> clflush size    : 64
>> cache_alignment : 64
>> address sizes   : 48 bits physical, 48 bits virtual
>> power management: ts ttp tm stc 100mhzsteps hwpstate [9]
>>
>> FreeBSD 9.0 had no problems in KVM with `-cpu host` on this system, so=

>> this would seem to be a regression.
>>
>=20
> Can you boot FreeBSD kernel on this machine bare ?

This machine is headless. It would be difficult for me to boot FreeBSD
on it.

>=20
> Also it could be useful to show the CPU features lines from FreeBSD 9.0=
,
> or just full verbose dmesgs of the boots in KVM with and without -cpu h=
ost.

Here is the dmesg output from FreeBSD 9.0-RELEASE with -cpu host:

Copyright (c) 1992-2012 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 9.0-RELEASE #0: Tue Jan  3 07:46:30 UTC 2012
    root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
CPU: AMD Phenom(tm) II X6 1090T Processor (3210.86-MHz K8-class CPU)
  Origin =3D "AuthenticAMD"  Id =3D 0x100fa0  Family =3D 10  Model =3D a
Stepping =3D 0

Features=3D0x1783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PG=
E,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
  Features2=3D0x80802001<SSE3,CX16,POPCNT,HV>
  AMD Features=3D0xe6500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,LM,3DNow!+,3DNo=
w!>
  AMD Features2=3D0x1f7<LAHF,CMP,SVM,CR8,ABM,SSE4A,MAS,Prefetch>
real memory  =3D 2147483648 (2048 MB)
avail memory =3D 2045132800 (1950 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <BOCHS  BXPCAPIC>
FreeBSD/SMP: Multiprocessor System Detected: 6 CPUs
FreeBSD/SMP: 1 package(s) x 6 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
 cpu4 (AP): APIC ID:  4
 cpu5 (AP): APIC ID:  5
ioapic0: Changing APIC ID to 6
ioapic0 <Version 1.1> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <BOCHS BXPCRSDT> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0xb008-0xb00b on acpi0
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
cpu4: <ACPI CPU> on acpi0
cpu5: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pci_link4: Unable to route IRQs: AE_NOT_FOUND
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX3 WDMA2 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc140-0xc14f at device 1.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
pci0: <bridge> at device 1.3 (no driver attached)
em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port
0xc100-0xc13f mem 0xfeba0000-0xfebbffff irq 10 at device 2.0 on pci0
em0: Memory Access and/or Bus Master bits were not set!
em0: Ethernet address: 52:54:00:00:ee:05
sym0: <895a> port 0xc000-0xc0ff mem
0xfebe2000-0xfebe23ff,0xfebe0000-0xfebe1fff irq 11 at device 3.0 on pci0
sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 100000000 Hz quality 950
atrtc0: <AT realtime clock> port 0x70-0x71,0x72-0x77 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <floppy drive controller> port 0x3f2-0x3f5,0x3f7 irq 6 drq 2 on acp=
i0
fdc0: does not respond
device_attach: fdc0 attach returned 6
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: console (9600,n,8,1)
sc0: <System console> at flags 0x100 on isa0
sc0: MDA <16 virtual consoles, flags=3D0x300>
vga0: <Generic ISA VGA> at port 0x3b0-0x3bb iomem 0xb0000-0xb7fff on isa0=

attimer0: <AT timer> at port 0x40 on isa0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is
present;
            to enable, add "vfs.zfs.prefetch_disable=3D0" to
/boot/loader.conf.
ZFS filesystem version 5
ZFS storage pool version 28
Timecounters tick every 10.000 msec
sym0: unknown interrupt(s) ignored, ISTAT=3D0x1 DSTAT=3D0x80 SIST=3D0x0
da0 at sym0 bus 0 scbus2 target 0 lun 0
da0: <QEMU QEMU HARDDISK 1.1.> Fixed Direct Access SCSI-5 device
da0: 3.300MB/s transfers
da0: Command Queueing enabled
da0: 409600MB (838860800 512 byte sectors: 255H 63S/T 52216C)
cd0 at ata1 bus 0 scbus1 target 0 lun 0
cd0: <QEMU QEMU DVD-ROM 1.1.> Removable CD-ROM SCSI-0 device
cd0: 16.700MB/s transfers (WDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #5 Launched!
SMP: AP CPU #4 Launched!
Trying to mount root from zfs:rpool/ROOT/freebsd []...

Here is the dmesg output from FreeBSD 9.0-RELEASE without -cpu host:

Copyright (c) 1992-2012 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 9.0-RELEASE #0: Tue Jan  3 07:46:30 UTC 2012
    root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
CPU: QEMU Virtual CPU version 1.1.1 (3210.87-MHz K8-class CPU)
  Origin =3D "AuthenticAMD"  Id =3D 0x623  Family =3D 6  Model =3D 2  Ste=
pping =3D 3

Features=3D0x1783fbfd<FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MC=
A,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
  Features2=3D0x80802001<SSE3,CX16,POPCNT,HV>
  AMD Features=3D0x20100800<SYSCALL,NX,LM>
  AMD Features2=3D0x67<LAHF,CMP,SVM,ABM,SSE4A>
real memory  =3D 2147483648 (2048 MB)
avail memory =3D 2045128704 (1950 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <BOCHS  BXPCAPIC>
FreeBSD/SMP: Multiprocessor System Detected: 6 CPUs
FreeBSD/SMP: 1 package(s) x 6 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
 cpu4 (AP): APIC ID:  4
 cpu5 (AP): APIC ID:  5
ioapic0: Changing APIC ID to 6
ioapic0 <Version 1.1> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <BOCHS BXPCRSDT> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0xb008-0xb00b on acpi0
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
cpu4: <ACPI CPU> on acpi0
cpu5: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pci_link4: Unable to route IRQs: AE_NOT_FOUND
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX3 WDMA2 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc140-0xc14f at device 1.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
pci0: <bridge> at device 1.3 (no driver attached)
em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port
0xc100-0xc13f mem 0xfeba0000-0xfebbffff irq 10 at device 2.0 on pci0
em0: Memory Access and/or Bus Master bits were not set!
em0: Ethernet address: 52:54:00:00:ee:05
sym0: <895a> port 0xc000-0xc0ff mem
0xfebe2000-0xfebe23ff,0xfebe0000-0xfebe1fff irq 11 at device 3.0 on pci0
sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 100000000 Hz quality 950
atrtc0: <AT realtime clock> port 0x70-0x71,0x72-0x77 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <floppy drive controller> port 0x3f2-0x3f5,0x3f7 irq 6 drq 2 on acp=
i0
fdc0: does not respond
device_attach: fdc0 attach returned 6
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: console (9600,n,8,1)
sc0: <System console> at flags 0x100 on isa0
sc0: MDA <16 virtual consoles, flags=3D0x300>
vga0: <Generic ISA VGA> at port 0x3b0-0x3bb iomem 0xb0000-0xb7fff on isa0=

attimer0: <AT timer> at port 0x40 on isa0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is
present;
            to enable, add "vfs.zfs.prefetch_disable=3D0" to
/boot/loader.conf.
ZFS filesystem version 5
ZFS storage pool version 28
Timecounters tick every 10.000 msec
sym0: unknown interrupt(s) ignored, ISTAT=3D0x1 DSTAT=3D0x80 SIST=3D0x0
da0 at sym0 bus 0 scbus2 target 0 lun 0
da0: <QEMU QEMU HARDDISK 1.1.> Fixed Direct Access SCSI-5 device
da0: 3.300MB/s transfers
da0: Command Queueing enabled
da0: 409600MB (838860800 512 byte sectors: 255H 63S/T 52216C)
cd0 at ata1 bus 0 scbus1 target 0 lun 0
cd0: <QEMU QEMU DVD-ROM 1.1.> Removable CD-ROM SCSI-0 device
cd0: 16.700MB/s transfers (WDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present
SMP: AP CPU #5 Launched!
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #4 Launched!
Trying to mount root from zfs:rpool/ROOT/freebsd []...

Here is the dmesg output from FreeBSD 9.1-BETA1 without -cpu host:

Copyright (c) 1992-2012 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 9.1-BETA1 #0: Fri Jul 20 21:39:23 EDT 2012
    root@freebsd:/usr/obj/usr/src/sys/GENERIC amd64
CPU: QEMU Virtual CPU version 1.1.1 (3210.87-MHz K8-class CPU)
  Origin =3D "AuthenticAMD"  Id =3D 0x623  Family =3D 6  Model =3D 2  Ste=
pping =3D 3

Features=3D0x1783fbfd<FPU,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MC=
A,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
  Features2=3D0x80802001<SSE3,CX16,POPCNT,HV>
  AMD Features=3D0x20100800<SYSCALL,NX,LM>
  AMD Features2=3D0x67<LAHF,CMP,SVM,ABM,SSE4A>
real memory  =3D 2147483648 (2048 MB)
avail memory =3D 2044076032 (1949 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <BOCHS  BXPCAPIC>
FreeBSD/SMP: Multiprocessor System Detected: 6 CPUs
FreeBSD/SMP: 1 package(s) x 6 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
 cpu4 (AP): APIC ID:  4
 cpu5 (AP): APIC ID:  5
ioapic0: Changing APIC ID to 6
ioapic0 <Version 1.1> irqs 0-23 on motherboard
kbd1 at kbdmux0
module_register_init: MOD_LOAD (vesa, 0xffffffff80b9c8b0, 0) error 19
ctl: CAM Target Layer loaded
acpi0: <BOCHS BXPCRSDT> on motherboard
acpi0: Power Button (fixed)
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
cpu4: <ACPI CPU> on acpi0
cpu5: <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 100000000 Hz quality 950
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0xb008-0xb00b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pci_link4: Unable to route IRQs: AE_NOT_FOUND
isab0: <PCI-ISA bridge> at device 1.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX3 WDMA2 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xc140-0xc14f at device 1.1 on pci0
ata0: <ATA channel> at channel 0 on atapci0
ata1: <ATA channel> at channel 1 on atapci0
pci0: <bridge> at device 1.3 (no driver attached)
em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.4> port
0xc100-0xc13f mem 0xfeba0000-0xfebbffff irq 10 at device 2.0 on pci0
em0: Memory Access and/or Bus Master bits were not set!
em0: Ethernet address: 52:54:00:00:ee:05
sym0: <895a> port 0xc000-0xc0ff mem
0xfebe2000-0xfebe23ff,0xfebe0000-0xfebe1fff irq 11 at device 3.0 on pci0
sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <floppy drive controller> port 0x3f2-0x3f5,0x3f7 irq 6 drq 2 on acp=
i0
fdc0: does not respond
device_attach: fdc0 attach returned 6
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart0: console (9600,n,8,1)
orm0: <ISA Option ROM> at iomem 0xc1800-0xc57ff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: MDA <16 virtual consoles, flags=3D0x300>
vga0: <Generic ISA VGA> at port 0x3b0-0x3bb iomem 0xb0000-0xb7fff on isa0=

attimer0: <AT timer> at port 0x40 on isa0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
fdc0: No FDOUT register!
ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is
present;
            to enable, add "vfs.zfs.prefetch_disable=3D0" to
/boot/loader.conf.
ZFS filesystem version 5
ZFS storage pool version 28
Timecounters tick every 10.000 msec
sym0: unknown interrupt(s) ignored, ISTAT=3D0x1 DSTAT=3D0x80 SIST=3D0x0
cd0 at ata1 bus 0 scbus1 target 0 lun 0
cd0: <QEMU QEMU DVD-ROM 1.1.> Removable CD-ROM SCSI-0 device
cd0: 16.700MB/s transfers (WDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present
da0 at sym0 bus 0 scbus2 target 0 lun 0
da0: <QEMU QEMU HARDDISK 1.1.> Fixed Direct Access SCSI-5 device
da0: 3.300MB/s transfers
da0: Command Queueing enabled
da0: 409600MB (838860800 512 byte sectors: 255H 63S/T 52216C)
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #5 Launched!
SMP: AP CPU #4 Launched!
SMP: AP CPU #2 Launched!
Trying to mount root from zfs:rpool/ROOT/freebsd []...


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