(gdb) bt
#0  0x000000001013c790 in __wt_page_in_func (session=0x3fff7b1d2ea0, 
    ref=0x100042b0680, flags=1451, 
    func=0x1046c3c8 <__func__.15056> "__tree_walk_internal", line=527)
    at ../src/btree/bt_read.c:809
#1  0x000000001016b5d0 in __wt_page_swap_func (session=0x3fff7b1d2ea0, 
    held=0x0, want=0x100042b0680, flags=1451, 
    func=0x1046c3c8 <__func__.15056> "__tree_walk_internal", line=527)
    at ../src/include/btree.i:1702
#2  0x000000001016c578 in __tree_walk_internal (session=0x3fff7b1d2ea0, 
    refp=0x3fff7719e3f8, walkcntp=0x0, skip_func=0x0, func_cookie=0x0, 
    flags=395) at ../src/btree/bt_walk.c:526
#3  0x000000001016c880 in __wt_tree_walk (session=0x3fff7b1d2ea0, 
    refp=0x3fff7719e3f8, flags=393) at ../src/btree/bt_walk.c:597
#4  0x0000000010057840 in __verbose_dump_cache_single (session=0x3fff7b1d2ea0, 
    total_bytesp=0x3fff7719e590, total_dirty_bytesp=0x3fff7719e598)
    at ../src/evict/evict_lru.c:2561
#5  0x0000000010057cd8 in __verbose_dump_cache_apply (session=0x3fff7b1d2ea0, 
    total_bytesp=0x3fff7719e590, total_dirty_bytesp=0x3fff7719e598)
    at ../src/evict/evict_lru.c:2666
#6  0x0000000010058030 in __wt_verbose_dump_cache (session=0x3fff7b1d2ea0)
    at ../src/evict/evict_lru.c:2704
#7  0x0000000010050b64 in __evict_server (session=0x3fff7b1d2ea0, 
    did_work=0x3fff7719e710) at ../src/evict/evict_lru.c:453
#8  0x0000000010050418 in __wt_evict_thread_run (session=0x3fff7b1d2ea0, 
    thread=0x100041fdb50) at ../src/evict/evict_lru.c:290
#9  0x00000000100e0778 in __thread_run (arg=0x100041fdb50)
    at ../src/support/thread_group.c:31
#10 0x00003fff7b768944 in start_thread () from /lib64/power8/libpthread.so.0
#11 0x00003fff7b5e7640 in clone () from /lib64/power8/libc.so.6
(gdb) p page
$1 = (WT_PAGE *) 0x0
(gdb) p *ref
$2 = {page = 0x0, home = 0x100042b8190, pindex_hint = 0, state = 5, 
  addr = 0x100042af91a, key = {recno = 4294967379, ikey = 0x100000053}, 
  page_del = 0x0, page_las = 0x0, hist = {{session = 0x3fff7b1d5888, 
      name = 0x104593f0 "WT_SESSION.verify", 
      file = 0x10468e28 "../src/btree/bt_read.c", line = 574, state = 5}, {
      session = 0x0, name = 0x0, file = 0x0, line = 0, state = 0}, {
      session = 0x0, name = 0x0, file = 0x0, line = 0, state = 0}}, 
  histoff = 1}