BUG: unable to handle kernel paging request at f579171c
IP: [<c01abbd4>] swap_count_continued+0x84/0x180
*pdpt = 0000000000939027 *pde = 00000000017ef067 *pte = 0000000000000000
Oops: 0000 [#1] SMP
Modules linked in:

Pid: 6813, comm: apache2 Not tainted 3.0.4-linode37 #1
EIP: 0061:[<c01abbd4>] EFLAGS: 00010246 CPU: 1
EIP is at swap_count_continued+0x84/0x180
EAX: f579171c EBX: ed1d2ec0 ECX: 00000000 EDX: 00000080
ESI: ed1d4640 EDI: 00000080 EBP: 0000071c ESP: ea101dd4
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069
Process apache2 (pid: 6813, ti=ea100000 task=ea12c030 task.ti=ea100000)
Stack:
 ebb11b40 0000a71c 00000040 00000000 c01abdc1 ea106f48 ebb11b40 0000a71c
 00000000 c01ae027 ea106f48 b7be9000 ea101e68 c01a00e3 9f4e0067 8000000f
 00000000 00000020 c0105c27 2924b063 0014e380 ea12d900 ecb2f0cc e924ede8
Call Trace:
 [<c01abdc1>] ? swap_entry_free+0xf1/0x120
 [<c01ae027>] ? free_swap_and_cache+0x27/0xd0
 [<c01a00e3>] ? zap_pte_range+0x173/0x460
 [<c0105c27>] ? xen_force_evtchn_callback+0x17/0x30
 [<c01a04d0>] ? unmap_page_range+0x100/0x180
 [<c01a05da>] ? unmap_vmas+0x8a/0xc0
 [<c01a2a93>] ? exit_mmap+0x73/0x100
 [<c0132bbb>] ? mmput+0x2b/0xc0
 [<c013642f>] ? exit_mm+0xef/0x120
 [<c06bf870>] ? _raw_spin_lock_irq+0x10/0x20
 [<c0137fd5>] ? do_exit+0x125/0x350
 [<c01a2a07>] ? remove_vma+0x37/0x50
 [<c013823c>] ? do_group_exit+0x3c/0xa0
 [<c01382b1>] ? sys_exit_group+0x11/0x20
 [<c06bfb71>] ? syscall_call+0x7/0xb