sparsemem panic in 2.6.17-rc5-mm1 and -mm2

[Martin Bligh <mbligh@google.com>]

http://test.kernel.org/abat/34264/debug/console.log

Only seems to happen on the sparsemem runs. Possibly a side-effect
of the page migration stuff, manifesting itself differently?
Or maybe not?

Out of Memory: Kill process 1 (idle) score 0 and children.
divide error: 0000 [#1]
SMP
last sysfs file:
CPU:    0
EIP:    0060:[<c013be6a>]    Not tainted VLI
EFLAGS: 00010246   (2.6.17-rc5-mm2-autokern1 #1)
EIP is at shrink_active_list+0x5b/0x382
eax: 00000000   ebx: 00000064   ecx: 00000000   edx: 00000000
esi: c0474500   edi: c03a8e64   ebp: c03a8dbc   esp: c03a8d9c
ds: 007b   es: 007b   ss: 0068
Process idle (pid: 1, threadinfo=c03a8000 task=c0769000)
Stack: 00000000 00000000 00000020 00000004 c03a8dac c03a8dac c03a8db4 
c03a8db4
       c03a8dbc c03a8dbc c03a8dfc c0137a14 00000000 c0137a37 c03a8df8 
c03a8df4
       c0474000 00000000 00000000 c03a8e64 c0137c5a 00000000 00028028 
000dc0e0
Call Trace:
 <c0137a14> get_writeback_state+0x30/0x35  <c0137a37> 
get_dirty_limits+0x1e/0xc4
 <c0137c5a> throttle_vm_writeout+0x18/0x53  <c013c221> 
shrink_zone+0x90/0xc1
 <c013c29f> shrink_zones+0x4d/0x5e  <c013c39d> try_to_free_pages+0xed/0x1a8
 <c0136a91> __alloc_pages+0x16e/0x26a  <c014e6c9> kmem_getpages+0x5b/0xac
 <c014f42c> cache_grow+0xb5/0x147  <c014f655> 
cache_alloc_refill+0x197/0x1d3
 <c014fad0> kmem_cache_alloc+0x4f/0x5e  <c0276dd8> sk_alloc+0x15/0x63
 <c02bb9e0> inet_create+0xfb/0x21a  <c027546d> __sock_create+0xc0/0xea
 <c02754b0> sock_create_kern+0xb/0xe  <c03c413b> icmp_init+0x3a/0xc3
 <c03c445c> inet_init+0x12b/0x174  <c03aa7f6> do_initcalls+0x53/0xe4
 <c01320d8> register_irq_proc+0x6a/0x90  <c0180000> 
xlate_proc_name+0x87/0x90
 <c0100349> init+0x41/0xdc  <c0100308> init+0x0/0xdc
 <c01009d5> kernel_thread_helper+0x5/0xb
Code: 04 24 00 00 00 00 8d 44 24 10 89 44 24 10 89 44 24 14 83 79 10 00 
74 38 8b 8a bc 01 00 00 6b 47 04 64 bb 64 00 00 00 31 d2 d3 fb <f7> 35 
0c 6f 45 c0 ba 02 00 00 00 89 d1 99 f7 f9 01 d8 03 47 18
EIP: [<c013be6a>] shrink_active_list+0x5b/0x382 SS:ESP 0068:c03a8d9c
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