sshd[1551] trap invalid opcode rip:2aeacc0677a0 rsp:7fffe0c7e688 error:0
 Eeek! page_mapcount(page) went negative! (-1)
   page pfn = 7f7a8
   page->flags = 400000000001002c
   page->count = 1
   page->mapping = ffff810056170550
   vma->vm_ops = 0xffffffff80667ba0
   vma->vm_ops->nopage = _stext+0x7fdf7000/0x20
   vma->vm_ops->fault = filemap_fault+0x0/0x450
   vma->vm_file->f_op->mmap = generic_file_mmap+0x0/0x50
 ------------[ cut here ]------------
 kernel BUG at mm/rmap.c:630!
 invalid opcode: 0000 [1] SMP 
 CPU 0 
 Pid: 2554, comm: atop Not tainted 2.6.23.1-ipot #1
 RIP: 0010:[<ffffffff8027550b>]  [<ffffffff8027550b>] page_remove_rmap+0x12b/0x140
 RSP: 0018:ffff810075183d98  EFLAGS: 00010296
 RAX: 000000000000003b RBX: ffff810002be2cc0 RCX: 0000000000000001
 RDX: ffffffff80663968 RSI: 0000000000000086 RDI: ffffffff80663960
 RBP: ffff81007dccf5d0 R08: 0000000000000000 R09: 0000000000000001
 R10: 0000000000000000 R11: 0000000000000000 R12: 00002ac92645c000
 R13: ffff810002be2cc0 R14: 00002ac926462000 R15: 0000000000026000
 FS:  0000000000000000(0000) GS:ffffffff806b4000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
 CR2: 00002ac92705a020 CR3: 0000000000201000 CR4: 00000000000006e0
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
 Process atop (pid: 2554, threadinfo ffff810075182000, task ffff81007fe6f7d0)
 Stack:  ffff8100013656f8 00002ac926462000 ffff8100751782e0 ffffffff8026cef3
  0000000000000000 ffffffff807235e0 ffff810002c0e5f8 00002ac926461fff
  0000000000000000 ffff810075183eb8 ffffffffffffffff 0000000000000000
 Call Trace:
  [<ffffffff8026cef3>] unmap_vmas+0x4f3/0x7e0
  [<ffffffff80271518>] exit_mmap+0x78/0x100
  [<ffffffff80230966>] mmput+0x26/0xb0
  [<ffffffff80236458>] do_exit+0x198/0x900
  [<ffffffff80236bec>] do_group_exit+0x2c/0x80
  [<ffffffff8020bbde>] system_call+0x7e/0x83
 
 
 Code: 0f 0b eb fe 48 8b 53 10 e9 65 ff ff ff 0f 1f 84 00 00 00 00 
 RIP  [<ffffffff8027550b>] page_remove_rmap+0x12b/0x140
  RSP <ffff810075183d98>
 Fixing recursive fault but reboot is needed!
 Bad page state in process 'kswapd0'
 page:ffff810002be2cc0 flags:0x4000000000010008 mapping:0000000000000000 mapcount:-1 count:0
 Trying to fix it up, but a reboot is needed
 Backtrace:
 
 Call Trace:
  [<ffffffff80263650>] bad_page+0x60/0xa0
  [<ffffffff80263f65>] free_hot_cold_page+0x345/0x350
  [<ffffffff80263f94>] __pagevec_free+0x24/0x30
  [<ffffffff80267210>] __pagevec_release_nonlru+0x60/0x70
  [<ffffffff8026885a>] shrink_page_list+0x26a/0x640
  [<ffffffff80267cfb>] isolate_lru_pages+0x8b/0x240
  [<ffffffff80268d79>] shrink_inactive_list+0x149/0x3f0
  [<ffffffff802690f0>] shrink_zone+0xd0/0x140
  [<ffffffff8026975d>] kswapd+0x3dd/0x520
  [<ffffffff80247560>] autoremove_wake_function+0x0/0x30
  [<ffffffff80269380>] kswapd+0x0/0x520
  [<ffffffff8024719b>] kthread+0x4b/0x80
  [<ffffffff8020c9f8>] child_rip+0xa/0x12
  [<ffffffff80247150>] kthread+0x0/0x80
  [<ffffffff8020c9ee>] child_rip+0x0/0x12
 
 list_lists[27598]: segfault at 0000000000000038 rip 000000000043b95a rsp 00007fff368010d0 error 4