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Oops on /dev/fb0


I'm running debian stable on a Sun Ultra 5. Everything is running
fine, but if I do a simple `cat /dev/fb0' I get an kernel oops.

This happens with the debian kernel 2.4.18, and the same with 2.6.1. Any
ideas what is going on? Or should I report this at 


PROMLIB: Sun IEEE Boot Prom 3.15.2 1998/11/10 10:35
Linux version 2.4.18 (root@vore) (gcc version egcs-2.92.11 19980921 (gcc2 ss-980609 experimental)) #2 Thu Apr 11 14:37:17 EDT 2002
Ethernet address: 08:00:20:a2:72:61
On node 0 totalpages: 32253
zone(0): 32678 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Found CPU 0 (node=f006d088,mid=0)
Found 1 CPU prom device tree node(s).
Kernel command line: root=/dev/hda2
Console: colour dummy device 80x25
Calibrating delay loop... 665.19 BogoMIPS
Memory: 253880k available (1944k kernel code, 512k data, 168k init) [fffff80000000000,000000001ff4c000]
Dentry-cache hash table entries: 32768 (order: 6, 524288 bytes)
Inode-cache hash table entries: 16384 (order: 5, 262144 bytes)
Mount-cache hash table entries: 4096 (order: 3, 65536 bytes)
Buffer-cache hash table entries: 8192 (order: 3, 65536 bytes)
Page-cache hash table entries: 32768 (order: 5, 262144 bytes)
POSIX conformance testing by UNIFIX
PCI: Probing for controllers.
PCI: Found SABRE, main regs at 000001fe00000000, wsync at 000001fe00001c20
SABRE: Shared PCI config space at 000001fe01000000
SABRE: DVMA at c0000000 [20000000]
PCI0(PBMA): Bus running at 33MHz
PCI0(PBMB): Bus running at 33MHz
ebus0: [auxio] [power] [SUNW,pll] [se] [su] [su] [ecpp] [fdthree] [eeprom] [flashprom] [SUNW,CS4231]
PCIO serial driver version 1.54
su(mouse) at 0x1fff13062f8 (irq = 4,7ea) is a 16550A
Sun Mouse-Systems mouse driver version 1.00
su(kbd) at 0x1fff13083f8 (irq = 9,7e9) is a 16550A
Sun TYPE 5 keyboard detected without keyclick
SAB82532 serial driver version 1.65
ttyS00 at 0x1fff1400000 (irq = 12,7eb) is a SAB82532 V3.2
ttyS01 at 0x1fff1400040 (irq = 12,7eb) is a SAB82532 V3.2
power: Control reg at 000001fff1724000 ... powerd running.
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
Journalled Block Device driver loaded
atyfb: 3D RAGE PRO (PQFP, PCI) [0x4750 rev 0x7c] 4M SGRAM, 14.31818 MHz XTAL, 230 MHz PLL, 100 Mhz MCLK
Console: switching to colour frame buffer device 160x64
fb0: ATY Mach64 frame buffer device on PCI
pty: 256 Unix98 ptys configured
rtc_init: no PC rtc found
block: 128 slots per queue, batch=32
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
CMD646: IDE controller on PCI bus 01 dev 18
CMD646: chipset revision 3
CMD646: chipset revision 0x03, MultiWord DMA Force Limited
CMD646: 100% native mode on irq 4,7e0
    ide0: BM-DMA at 0x1fe02c00020-0x1fe02c00027, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0x1fe02c00028-0x1fe02c0002f, BIOS settings: hdc:pio, hdd:pio
hda: Maxtor 6Y120P0, ATA DISK drive
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
hdc: CRD-8322B, ATAPI CD/DVD-ROM drive
ide0 at 0x1fe02c00000-0x1fe02c00007,0x1fe02c0000a on irq 4,7e0
ide1 at 0x1fe02c00010-0x1fe02c00017,0x1fe02c0001a on irq 4,7e0 (shared with ide0)
hda: 240121728 sectors (122942 MB) w/7936KiB Cache, CHS=238216/16/63, (U)DMA
hdc: ATAPI 32X CD-ROM drive, 128kB Cache
Uniform CD-ROM driver Revision: 3.12
Partition check:
 hda: hda1 hda2 hda3 hda4
Floppy drive(s): fd0 is 1.44M
FDC 0 is a National Semiconductor PC87306
loop: loaded (max 8 devices)
sunhme.c:v1.99 12/Sep/99 David S. Miller (davem@redhat.com)
eth0: HAPPY MEAL (PCI/CheerIO) 10/100BaseT Ethernet 08:00:20:a2:72:61 
SCSI subsystem driver Revision: 1.00
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb-ohci.c: USB OHCI at membase 0x1ff00002000, IRQ 10,7d0
usb-ohci.c: usb-02:01.0, PCI device 1095:0670
usb.c: new USB bus registered, assigned bus number 1
hub.c: USB hub found
hub.c: 2 ports detected
usb.c: registered new driver keyboard
usbkbd.c: :USB HID Boot Protocol keyboard driver
mice: PS/2 mouse device common for all mice
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 2048 buckets, 32Kbytes
TCP: Hash tables configured (established 16384 bind 16384)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Adding Swap: 1048808k swap-space (priority -1)
EXT3 FS 2.4-0.9.17, 10 Jan 2002 on ide0(3,2), internal journal
sys32_ioctl(hwclock:34): Unknown cmd fd(3) cmd(00004b50) arg(effff910)
sys32_ioctl(hwclock:35): Unknown cmd fd(3) cmd(00004b50) arg(effff910)
kjournald starting.  Commit interval 5 seconds
EXT3 FS 2.4-0.9.17, 10 Jan 2002 on ide0(3,4), internal journal
EXT3-fs: mounted filesystem with ordered data mode.
sys32_ioctl(hwclock:113): Unknown cmd fd(3) cmd(00004b50) arg(effff910)
eth0: Link is up using internal transceiver at 100Mb/s, Full Duplex.
Warning: Remapping obsolete /dev/fb* minor 32 to 1
Warning: Remapping obsolete /dev/fb* minor 64 to 2
Warning: Remapping obsolete /dev/fb* minor 96 to 3
Warning: Remapping obsolete /dev/fb* minor 128 to 4
Warning: Remapping obsolete /dev/fb* minor 160 to 5
Warning: Remapping obsolete /dev/fb* minor 192 to 6
Warning: Remapping obsolete /dev/fb* minor 224 to 7
OBP Flash: RD 1fff0000000[100000] WR 1fff0000000[100000]
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
Unable to handle kernel paging request at virtual address 00000000e1800000
tsk->{mm,active_mm}->context = 0000000000000532
tsk->{mm,active_mm}->pgd = fffff80013f2f000
              \|/ ____ \|/
              "@'/ .. \`@"
              /_| \__/ |_\
cat(1331): Oops
TSTATE: 0000000080009601 TPC: 00000000005da400 TNPC: 00000000005da404 Y: 07000000    Not tainted
g0: 00000000005f5f6c g1: 000001ffe1800000 g2: 0000000000000000 g3: fffff80012b3fdcb
g4: fffff80000000000 g5: 0000000000000018 g6: fffff80012b3c000 g7: 00000000005da000
o0: 00000000000235a8 o1: 000001ffe1800000 o2: 0000000000002000 o3: 0000000000000080
o4: 0000000000000011 o5: 0000000000000000 sp: fffff80012b3f511 ret_pc: 0000000000553e48
l0: fffff80012b3fdc0 l1: 0000000000660878 l2: 0000000000000000 l3: 0000000070028b38
l4: 00000000700004b4 l5: 0000000000000000 l6: 00000000700002f4 l7: 00000000700283c8
i0: 0000000000002000 i1: 00000000000235a8 i2: fffff8001fdf6000 i3: fffff800154e0a58
i4: 0000000000553da0 i5: 0000000000000000 i6: fffff80012b3f621 i7: 0000000000465110
Instruction DUMP: 8a204005  8782e000  83b24300 <c9986000> 94228005  cd986008  82006008  8aa16008  87832000 

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