doing a "cat /proc/ide/hdb/identity' results in:

hdb: bad special flag: 0x03
Unable to handle kernel NULL pointer dereference at virtual address 00000028
 printing eip:
c01bc9f5
*pde = 00000000
Oops: 0000
 
CPU:    0
EIP:    0060:[<c01bc9f5>]    Not tainted
EFLAGS: 00010046
EIP is at task_in_intr+0xf5/0x130
eax: 00000000   ebx: 00000001   ecx: 00000000   edx: 000001f0
esi: cea31e18   edi: c0371dd4   ebp: 00000292   esp: c1385da8
ds: 0068   es: 0068   ss: 0068
Process kjournald (pid: 9, threadinfo=c1384000 task=c12ef2c0)
Stack: c0371dd4 00000001 00000000 c1384000 cfe1f214 c0371dd4 c01c0057 c0371dd4
       c01bc900 c0371ba0 cfff576c 04000001 0000000e c1385e28 c0108e6a 0000000e
       cfe1f214 c1385e28 c1384000 cfff576c 0000000e c02abac0 c0109021 0000000e
Call Trace:
 [<c01c0057>] ide_intr+0x117/0x190
 [<c01bc900>] task_in_intr+0x0/0x130
 [<c0108e6a>] handle_IRQ_event+0x3a/0x60
 [<c0109021>] do_IRQ+0xa1/0x130
 [<c0107ae4>] common_interrupt+0x18/0x20
 [<c0179cd2>] __journal_clean_checkpoint_list+0x62/0x80
 [<c0177859>] journal_commit_transaction+0x299/0x1484
 [<c0112fab>] schedule+0x27b/0x2e0
 [<c0113060>] default_wake_function+0x0/0x40
 [<c017ac73>] kjournald+0x1a3/0x390
 [<c017aab0>] commit_timeout+0x0/0x10
 [<c017aad0>] kjournald+0x0/0x390
 [<c01054e5>] kernel_thread_helper+0x5/0x10
 
Code: ff 50 28 83 c4 0c 85 c0 75 04 31 c0 eb 29 8b 87 00 01 00 00
 <0>Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing