Andrew,

I've got this trace on an AMD64 machine at startup:

Unable to handle kernel paging request at 0000000000100288 RIP:
<ffffffff801dc0e4>{do_task_stat+980}
PML4 1a42f067 PGD 13fad067 PMD 0
Oops: 0000 [1]
CPU 0
Modules linked in: usbserial parport_pc lp parport joydev sg st sd_mod sr_mod 
scsi_mod ohci1394 ieee1394 usbhid yentd
Pid: 11522, comm: pidof Not tainted 2.6.9-rc1-mm4
RIP: 0010:[<ffffffff801dc0e4>] <ffffffff801dc0e4>{do_task_stat+980}
RSP: 0018:00000100112e7cc8  EFLAGS: 00010283
RAX: 00000000000fff68 RBX: 000001000eb909d0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000000fff68
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 000001001ff0f140 R11: 0000000000000065 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000002a9588d6e0(0000) GS:ffffffff805a72c0(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000100288 CR3: 0000000000101000 CR4: 00000000000006e0
Process pidof (pid: 11522, threadinfo 00000100112e6000, task 0000010013464230)
Stack: 0000000000000001 0000000000000246 0000000000000001 0000000000100000
       00000100112e7d88 0006000000000006 0000000000000246 00000100112e7e28
       0000000000000001 0000000200000010
Call Trace:<ffffffff802a322a>{avc_has_perm+90} 
<ffffffff802a322a>{avc_has_perm+90}
       <ffffffff802a4ae6>{inode_has_perm+134} 
<ffffffff802a4ae6>{inode_has_perm+134}
       <ffffffff801d8c3b>{proc_info_read+107} <ffffffff80190ca4>{vfs_read+228}
       <ffffffff80190de3>{sys_read+83} <ffffffff80110be2>{system_call+126}


Code: 48 8b b7 20 03 00 00 48 01 b4 24 38 01 00 00 4c 03 bf 28 03
RIP <ffffffff801dc0e4>{do_task_stat+980} RSP <00000100112e7cc8>
CR2: 0000000000100288

It is not reproducible, but looks suspicious to me.  Attached are the .config 
and the output of dmesg.

Greets,
RJW

-- 
- Would you tell me, please, which way I ought to go from here?
- That depends a good deal on where you want to get to.
		-- Lewis Carroll "Alice's Adventures in Wonderland"