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Re: kernel has null dereference during boot

hendrik@topoi.pooq.com wrote:
While booting my newly installed woody system (Why not sarge?
It's a long story which will be told another time) the kernel
crashes,  recovers, and fails to make one of my hard disk

Here's the relevant part of the dmesg output:

Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX: IDE controller on PCI bus 00 dev 38
PIIX: chipset revision 2
PIIX: not 100% native mode: will probe irqs later
PIIX: neither IDE port enabled (BIOS)
PIIX: IDE controller on PCI bus 00 dev 39
PIIX: chipset revision 2
PIIX: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0x3000-0x3007, BIOS settings: hda:pio, hdb:pio
    ide1: BM-DMA at 0x3008-0x300f, BIOS settings: hdc:pio, hdd:pio

hdb: Mxo 89H             , ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 12672450 sectors (6488 MB), CHS=13410/15/63
hdb: 264241407 sectors (135292 MB) w/2111KiB Cache, CHS=16383/127/127
Partition check:
 /dev/ide/host0/bus0/target0/lun0: [PTBL] [788/255/63] p1 p2 p3 p4 < p5 p6 p7 p8 p9 p10 >
Unable to handle kernel NULL pointer dereference at virtual address 00000028
 printing eip:
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<c382f3c1>]    Not tainted
EFLAGS: 00010212
eax: 00000000   ebx: 000003f0   ecx: 00000300   edx: 00000045
esi: c384b144   edi: 00000040   ebp: 00000040   esp: c2c49ee8
ds: 0018   es: 0018   ss: 0018
Process modprobe (pid: 28, stackpage=c2c49000)
Stack: c384b144 00000001 c384afe0 00000001 c384b210 03002980 c382f458 00000340 00000000 00000002 c3852980 000019e0 c3831fc5 c38524d9 c38529c0 c3851000 00000001 00000001 c01156fd c2c48000 400199d8 bfffc4dc bfffc49c 00001800 Call Trace: [<c384b144>] [<c384afe0>] [<c384b210>] [<c382f458>] [<c3852980>] [<c3831fc5>] [<c38524d9>] [<c38529c0>] [<c01156fd>] [<c3851060>] [<c0106d93>] Code: 83 78 28 00 74 09 56 8b 40 28 ff d0 83 c4 04 80 a6 9e 00 00 <3>ext3: No journal on filesystem on ide0(3,2)
Adding Swap: 128516k swap-space (priority -1)
Real Time Clock Driver v1.10e

By the way, I'm also wondering about the weird characters in the line
that identifies my second hard disk, an 80G Maxtor, but I don't think
they do any harm in themselves.

hdb: Mxo 89H             , ATA DISK drive
Things you can try:

-if there is a BIOS CHS setting for that drive, or it's set to "AUTO" turn it off (no drive present). Linux will still find the drive. Conversely if the BIOS is already set to "no drive present," set it to the correct CHS setting for that drive.

-Try a different kernel

-Test the Maxtor on a different motherboard.

-If you are ambitious, recompile the kernel and printk the drive ID string to see
how or why it's being corrupted, then submit a bug report or patch to the IDE guy (especially if the bug is still in the latest kernel).


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