2.5.29 serial oops

This appears to be nondeterministic in nature:

Reading Oops report from the terminal

Unable to handle kernel paging request at virtual address ffffff8a
c01a0f4a      
*pde = 00000000
Oops: 0000     
CPU:    3 
EIP:    0010:[<c01a0f4a>]    Not tainted

Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: c039a6f0 ebx: ffffff70 ecx: 00000003 edx: 00000002
esi: 00000000 edi: 00000000 ebp: c039a6f0 esp: cc0e1f04
ds: 0018 es: 0018 ss: 0018

Stack: ffffff70 00000000 c01a1e46 ffffff70 00000002 f79873c0 00000001 00000004 
       cc0e1f80 00000000 c039a6f0 00000018 c0109155 00000004 c039a6f0 cc0e1f80 
       c0323880 c0323890 c0323890 cc0e1f78 c01093df 00000004 cc0e1f80 f79873c0 
Call Trace: [<c01a1e46>] [<c0109155>] [<c01093df>] [<c0105360>] [<c0107cf0>]   
   [<c0105360>] [<c0105389>] [<c0105413>] [<c011829b>] [<c0118119>]          
Code: 0f b6 4b 1a d3 e2 0f b6 43 1b 83 f8 01 74 07 83 f8 02 74 39 

Trace; c01a1e46 <serial8250_interrupt+5a/15c>
Trace; c0109155 <handle_IRQ_event+29/4c>
Trace; c01093df <do_IRQ+df/190>
Trace; c0105360 <default_idle+0/34>
Trace; c0107cf0 <common_interrupt+18/20>
Trace; c0105360 <default_idle+0/34>
Trace; c0105389 <default_idle+29/34>
Trace; c0105413 <cpu_idle+37/48>
Trace; c011829b <release_console_sem+10b/118>
Trace; c0118119 <printk+185/1c4>

Code; c01a0f4a <serial_in+a/84>
00000000 <_EIP>:
Code; c01a0f4a <serial_in+a/84> <=====
0: 0f b6 4b 1a movzbl 0x1a(%ebx),%ecx <=====
Code; c01a0f4e <serial_in+e/84>
4: d3 e2 shl %cl,%edx
Code; c01a0f50 <serial_in+10/84>
6: 0f b6 43 1b movzbl 0x1b(%ebx),%eax
Code; c01a0f54 <serial_in+14/84>
a: 83 f8 01 cmp $0x1,%eax
Code; c01a0f57 <serial_in+17/84>
d: 74 07 je 16 <_EIP+0x16> c01a0f60 <serial_in+20/84>
Code; c01a0f59 <serial_in+19/84>
f: 83 f8 02 cmp $0x2,%eax
Code; c01a0f5c <serial_in+1c/84>
12: 74 39 je 4d <_EIP+0x4d> c01a0f97 <serial_in+57/84>

<0>Kernel panic: Aiee, killing interrupt handler!