Panic on shutdown

Does this look familiar to anyone? Virgin 2.5.52 on NUMA-Q.

Saving random seed... done.
Unmounting remote filesystems... Unable to handle kernel NULL pointer dereferenc e at virtual address 00000504
printing eip:
c012e5d0
*pde = 00104001
*pte = 00000000

Oops: 0002
CPU:    15
EIP:    0060:[<c012e5d0>]    Not tainted
EFLAGS: 00010046

EIP is at __pdflush+0x30/0x1e8
eax: 00000000 ebx: ede14000 ecx: eeff2d64 edx: eeff2cc0
esi: c020bcf4 edi: eeff2fae ebp: ede15fd8 esp: ede15fc0
ds: 0068 es: 0068 ss: 0068
Process pdflush (pid: 4033, threadinfo=ede14000 task=eeff2cc0)

Stack: c012e788 00000000 00000000 00000000 c012e793 ede15fd8 00000000 00000000
      00000068 00000068 ffffffff c0106e7c c0106e81 00000000 00000000 
00000000
Call Trace:
[<c012e788>] pdflush+0x0/0x14
[<c012e793>] pdflush+0xb/0x14
[<c0106e7c>] kernel_thread_helper+0x0/0xc
[<c0106e81>] kernel_thread_helper+0x5/0xc

Code: f0 fe 88 04 05 00 00 0f 88 60 02 00 00 8b 03 c7 80 a0 05 00

<1>Unable to handle kernel NULL pointer dereference at virtual address 0000051c printing eip:
c011c3e3
*pde = 2f664001
*pte = 00000000

Oops: 0000
CPU:    10
EIP:    0060:[<c011c3e3>]    Not tainted
EFLAGS: 00010286

EIP is at sys_wait4+0x23b/0x418
eax: 00000008 ebx: 00000000 ecx: 00000000 edx: 00000008
esi: eeff2cc0 edi: f018e0dc ebp: f0198000 esp: f0199f7c
ds: 0068 es: 0068 ss: 0068
Process init (pid: 1, threadinfo=f0198000 task=f018e040)

Stack: f0198000 00000000 bffff750 bffff714 f0198000 00000001 f018e040 00000000
      f018e040 c0116d88 00000000 00000000 00000000 f018e040 c0116d88 
f018e194
      f018e194 c0108a27 ffffffff bffff750 00000001 00000000 bffff750 
bffff714
Call Trace:
[<c0116d88>] default_wake_function+0x0/0x34
[<c0116d88>] default_wake_function+0x0/0x34
[<c0108a27>] syscall_call+0x7/0xb

Code: 83 b9 1c 05 00 00 00 74 2a 8b 54 24 4c 83 c2 04 19 c0 39 55

<0>Kernel panic: Attempted to kill init!