Oops in swap code

["Stephen C. Tweedie" <sct@redhat.com>]

Hi,

Just saw this from a Red Hat beta (wolverine) user: ring any bells?

It's a kernel BUG() in activate_page_nolock():

/*
 * Move an inactive page to the active list.
 */
void activate_page_nolock(struct page * page)
{
	if (PageInactiveDirty(page)) {
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
		del_page_from_inactive_dirty_list(page);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
		add_page_to_active_list(page);
	} else if (PageInactiveClean(page)) {
		del_page_from_inactive_clean_list(page);
		add_page_to_active_list(page)d_page+0/4096]

kernel BUG at swap.c:201!
invalid operand: 0000
CPU:    0
EIP:    0010:[activate_page_nolock+110/528]
EIP:    0010:[<c012aaae>]
EFLAGS: 00010282
eax: 0000001a   ebx: c1103ef4   ecx: fffffffe   edx: 00000000
esi: c1103ef4   edi: 00000070   ebp: 00000000   esp: c1167f94
ds: 0018   es: 0018   ss: 0018
Process kswapd (pid: 3, stackpage=c1167000)
Stack: c020a29b c020a456 000000c9 c1103ef4 c012a822 c1103ef4 c1103f10 c012c295 
       c1103ef4 00010f00 c024f5e0 00000006 0008e000 c012c5d7 00000006 00000000 
       c0105000 0008e000 00000000 00000018 00000018 c1177fa8 c0105000 c0107576 
Call Trace: [age_page_up_nolock+18/48] [refill_inactive_scan+101/240] [kswapd+119/240] [empty_bad_page+0/4096] [empty_bad_page+0/4096] [kernel_thread+38/48] [kswapd+0/240] 
Call Trace: [<c012a822>] [<c012c295>] [<c012c5d7>] [<c0105000>] [<c0105000>] [<c0107576>] [<c012c560>] 
Code: 0f 0b 83 c4 0c 8b 43 14 85 c0 75 19 68 c9 00 00 00 68 56 a4 

This seems to be reproducible.

--Stephen
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