[Bug 202109] [kvm][panic] KVM guest crash at boot while attaching keyboard

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202109

            Bug ID: 202109
           Summary: [kvm][panic] KVM guest crash at boot while attaching
                    keyboard
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: filipe.utzig at acad.pucrs.br

Trying to boot FreeBSD 10.1-RELEASE guest on a Linux KVM host, using libvirt
and virt-manager, ends in a kernel panic while attaching keyboard.


atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
atkbd: the current kbd controller command byte 0061
atkbd: keyboard ID 0x41ab (2)
kbdc: RESET_KBD return code:00fa
kbdc: RESET_KBD status:00aa
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address    = 0xfffffe002bf4d000
fault code        = supervisor read data, page not present
instruction pointer    = 0x20:0xffffffff80e0b591
stack pointer            = 0x28:0xffffffff8195b6c0
frame pointer            = 0x28:0xffffffff8195b6d0
code segment        = base 0x0, limit 0xfffff, type 0x1b
            = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags    = resume, IOPL = 0
current process        = 0 (swapper)
trap number        = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80963000 at kdb_backtrace+0x60
#1 0xffffffff80928125 at panic+0x155
#2 0xffffffff80d24f1f at trap_fatal+0x38f
#3 0xffffffff80d25238 at trap_pfault+0x308
#4 0xffffffff80d2489a at trap+0x47a
#5 0xffffffff80d0a782 at calltrap+0x8
#6 0xffffffff80e0d19b at x86emu_exec_one_byte+0x19eb
#7 0xffffffff80e0b748 at x86emu_exec+0x28
#8 0xffffffff80e0ac35 at x86bios_intr+0xc5
#9 0xffffffff80d375f5 at get_typematic+0x55
#10 0xffffffff80d36bad at atkbd_init+0x33d
#11 0xffffffff80d365df at atkbd_attach_unit+0x8f
#12 0xffffffff80d37e8b at atkbdattach+0x4b
#13 0xffffffff80959fc5 at device_attach+0x3a5
#14 0xffffffff8095b0cd at bus_generic_attach+0x2d
#15 0xffffffff80d39ffc at atkbdc_isa_attach+0x17c
#16 0xffffffff80959fc5 at device_attach+0x3a5
#17 0xffffffff8095b0cd at bus_generic_attach+0x2d
Uptime: 1s
Automatic reboot in 15 seconds - press a key on the console to abort



This issue doesn't happen in FreeBSD 9.3-RELEASE.

How-To-Repeat: Try to Install a FreeBSD 10.1-RELEASE guest on a Linux KVM host
with virt-manager with default hardware configuration.

More information attached:

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