Bug 109760

Hi. Problem is following:
When i "kldunload acpi_video", my system crash - completely. Second time
I tried it, I jumped to debugger and see this output:

/* Output: */

Fatal trap 12: page fault while in kernel mode
cpuid=0; apic id=00
fault virtual address  = 0x10
fault code             = supervisor read, page not present
instruction pointer    = 0x20:0xc0d19a10
stack pointer          = 0x28:0xd6295b70
frame pointer          = 0x28:0x6295b88
code segment           = base rx0, limit 0xfffff, type 0x1b
                       = DPL 0, pres 1, def32 1, gran 1
processor eflags       = interrupt enabled, resume, IOPL=0
current process        = 983 (kldunload)
[thread pid 982 tid 100066 ]
Stopped at acpi_video_vo_destroy+0x80: movl 0x10(%eax), %ecx

/* End of output */

I have so 1 hour old current system. (2.3. 2007 18:30). Notebook Prestigio
Nobile 157. My dmesg output is:

/* Dmesg: */

Copyright (c) 1992-2007 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 7.0-CURRENT #3: Fri Mar  2 17:18:34 UTC 2007
    root@Vallhala:/usr/obj/usr/src/sys/GENERIC
WARNING: WITNESS option enabled, expect reduced performance.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) M processor 1.70GHz (1694.51-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x6d6  Stepping = 6
  Features=0xafe9f9bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,TM,PBE>
  Features2=0x180<EST,TM2>
real memory  = 536281088 (511 MB)
avail memory = 510894080 (487 MB)
kbd1 at kbdmux0
ath_hal: 0.9.20.3 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
acpi0: <PTLTD Wistron> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
acpi_ec0: <Embedded Controller: GPE 0x1c> port 0x62,0x66 on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_acad0: <AC Adapter> on acpi0
battery0: <ACPI Control Method Battery> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_button0: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci_link3: BIOS IRQ 11 for 0.29.INTB is invalid
pci0: <ACPI PCI bus> on pcib0
agp0: <Intel 82855 host to AGP bridge> on hostb0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
vgapci0: <VGA-compatible display> port 0x3000-0x30ff mem 0xd8000000-0xdfffffff,0xd0100000-0xd010ffff irq 11 at device 0.0 on pci1
acpi_video0: <ACPI video extension> on vgapci0
uhci0: <Intel 82801DB (ICH4) USB controller USB-A> port 0x1800-0x181f irq 11 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
uhci0: [ITHREAD]
usb0: <Intel 82801DB (ICH4) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801DB (ICH4) USB controller USB-B> port 0x1820-0x183f irq 10 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
uhci1: [ITHREAD]
usb1: <Intel 82801DB (ICH4) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801DB (ICH4) USB controller USB-C> port 0x1840-0x185f irq 11 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
uhci2: [ITHREAD]
usb2: <Intel 82801DB (ICH4) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb2
uhub2: 2 ports with 2 removable, self powered
ehci0: <Intel 82801DB/L/M (ICH4) USB 2.0 controller> mem 0xd0000000-0xd00003ff irq 10 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
ehci0: [ITHREAD]
usb3: EHCI version 1.0
usb3: companion controllers, 2 ports each: usb0 usb1 usb2
usb3: <Intel 82801DB/L/M (ICH4) USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb3
uhub3: 6 ports with 6 removable, self powered
pcib2: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci_link3: BIOS IRQ 11 for 2.5.INTA is invalid
pci2: <ACPI PCI bus> on pcib2
bfe0: <Broadcom BCM4401 Fast Ethernet> mem 0xd0200000-0xd0201fff irq 10 at device 5.0 on pci2
miibus0: <MII bus> on bfe0
bmtphy0: <BCM4401 10/100baseTX PHY> PHY 1 on miibus0
bmtphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
bfe0: using obsoleted if_watchdog interface
bfe0: Ethernet address: 00:0a:e4:b6:20:82
bfe0: [ITHREAD]
iwi0: <Intel(R) PRO/Wireless 2915ABG> mem 0xd0202000-0xd0202fff irq 11 at device 6.0 on pci2
iwi0: using obsoleted if_watchdog interface
iwi0: Ethernet address: 00:0e:35:ef:56:1e
iwi0: [ITHREAD]
cbb0: <RF5C476 PCI-CardBus Bridge> at device 9.0 on pci2
cardbus0: <CardBus bus> on cbb0
pccard0: <16-bit PCCard bus> on cbb0
cbb0: [ITHREAD]
cbb1: <RF5C476 PCI-CardBus Bridge> irq 10 at device 9.1 on pci2
cardbus1: <CardBus bus> on cbb1
pccard1: <16-bit PCCard bus> on cbb1
cbb1: [ITHREAD]
fwohci0: <Ricoh R5C552> mem 0xd0203000-0xd02037ff irq 11 at device 9.2 on pci2
fwohci0: [ITHREAD]
fwohci0: OHCI version 1.0 (ROM=0)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 06:e4:0a:00:69:4f:10:03
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 06:e4:0a:4f:10:03
fwe0: Ethernet address: 06:e4:0a:4f:10:03
fwe0: if_start running deferred for Giant
sbp0: <SBP-2/SCSI over FireWire> on firewire0
fwohci0: Initiate bus reset
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
firewire0: bus manager 0 (me)
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH4 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x1860-0x186f at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
ata1: [ITHREAD]
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
pcm0: <Intel ICH4 (82801DB)> port 0x1c00-0x1cff,0x18c0-0x18ff mem 0xd0000c00-0xd0000dff,0xd0000800-0xd00008ff irq 10 at device 31.5 on pci0
pcm0: [ITHREAD]
pcm0: <Cirrus Logic CS4299 AC97 Codec>
pci0: <simple comms, generic modem> at device 31.6 (no driver attached)
acpi_tz0: <Thermal Zone> on acpi0
acpi_tz1: <Thermal Zone> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: [ITHREAD]
psm0: model Generic PS/2 mouse, device ID 0
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xc0000-0xcffff,0xd0000-0xd0fff,0xd8000-0xdbfff,0xdc000-0xdffff pnpid ORM0000 on isa0
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0: configured irq 4 not in bitmap of probed irqs 0
sio0: port may not be enabled
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 8250 or not responding
sio0: [FILTER]
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounter "TSC" frequency 1694509095 Hz quality 800
Timecounters tick every 1.000 msec
ad0: 57231MB <HTE726060M9AT00 MH4OA6AA> at ata0-master UDMA100
GEOM_LABEL: Label for provider ad0s2 is ext2fs//.
acd0: DVDR <QSI DVD+/-RW SDW-082/LX32> at ata1-master UDMA33
cd0 at ata1 bus 0 target 0 lun 0
cd0: <QSI DVD+-RW SDW-082 LX32> Removable CD-ROM SCSI-0 device 
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present

/* End of dmesg */

When i try kldunload to other module (atapicam, if_iwi, etc.) it don't crash.

I am sorry, if this is "for s*it". When do you anything about this problem
know, of course i will send you some outputs, logs, etc.

Thanks, Milan

How-To-Repeat: kldunload acpi_video