(gdb) where
#0  _mm_loadu_si128 (__P=0x7fd600795ff4)
    at /usr/lib/gcc/x86_64-redhat-linux/4.8.3/include/emmintrin.h:684
WT-1  __wt_lex_compare_skip (user_item=0x7fd6000b82e8, user_item=0x7fd6000b82e8,
    tree_item=0x7fd6000b8430, tree_item=0x7fd6000b8430,
    matchp=<synthetic pointer>) at ../src/include/btree_cmp.i:153
WT-2  __wt_row_search (session=session@entry=0x1cf47f0,
    srch_key=srch_key@entry=0x7fd6000b82e8, leaf=0x2452c60,
    cbt=cbt@entry=0x7fd6000b8210, insert=insert@entry=1)
    at ../src/btree/row_srch.c:371
WT-3  0x00000000004d6a79 in __cursor_row_search (insert=1, leaf=<optimized out>,
    cbt=0x7fd6000b8210, session=0x1cf47f0) at ../src/btree/bt_cursor.c:241
WT-4  __wt_btcur_search_near (cbt=cbt@entry=0x7fd6000b8210,
    exactp=exactp@entry=0x7fd61eb17b20) at ../src/btree/bt_cursor.c:399
WT-5  0x000000000049e6aa in __curfile_search_near (cursor=0x7fd6000b8210,
    exact=0x7fd61eb17b20) at ../src/cursor/cur_file.c:222
WT-6  0x00000000004af16b in __clsm_next (cursor=0x7fd60031ce10)
    at ../src/lsm/lsm_cursor.c:799
(gdb) f 1
WT-1  __wt_lex_compare_skip (user_item=0x7fd6000b82e8, user_item=0x7fd6000b82e8,
    tree_item=0x7fd6000b8430, tree_item=0x7fd6000b8430,
    matchp=<synthetic pointer>) at ../src/include/btree_cmp.i:153
153					u = _mm_loadu_si128((__m128i *)userp);
(gdb) list
148			else
149				for (; len > 0;
150				    len -= WT_VECTOR_SIZE,
151				    userp += WT_VECTOR_SIZE, treep += WT_VECTOR_SIZE,
152				    *matchp += WT_VECTOR_SIZE) {
153					u = _mm_loadu_si128((__m128i *)userp);
154					t = _mm_loadu_si128((__m128i *)treep);
155					res_eq = _mm_cmpeq_epi8(u, t);
156					if (_mm_movemask_epi8(res_eq) != 65535)
157						break;
(gdb) print usz
$1 = 22
(gdb) print tsz
$2 = 19
(gdb) print *matchp
$3 = 2341604
(gdb) print userp - user_item->data
$4 = 2341604
(gdb) print len
$10 = 18446744073707210016