Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f7f53881a84 in __wt_page_release (session=session@entry=0x1398000, ref=ref@entry=0x0, flags=flags@entry=4791)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/include/btree_inline.h:1984
1984	    btree = S2BT(session);
[Current thread is 1 (Thread 0x7f7f53242000 (LWP 10202))]
(gdb) where
#0  0x00007f7f53881a84 in __wt_page_release (session=session@entry=0x1398000, ref=ref@entry=0x0, flags=flags@entry=4791)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/include/btree_inline.h:1984
#1  0x00007f7f53881c71 in __wt_page_swap_func (session=session@entry=0x1398000, held=held@entry=0x0, want=want@entry=0x34448c0, flags=4791,
    func=func@entry=0x7f7f53a5f200 <__PRETTY_FUNCTION__.7> "__tree_walk_internal", line=line@entry=467) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/include/btree_inline.h:2219
#2  0x00007f7f5388269f in __tree_walk_internal (session=session@entry=0x1398000, refp=refp@entry=0x7ffc583e06b8, walkcntp=walkcntp@entry=0x0, skip_func=skip_func@entry=0x0,
    func_cookie=func_cookie@entry=0x0, flags=4659, flags@entry=4147) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/btree/bt_walk.c:467
#3  0x00007f7f53882a31 in __wt_tree_walk (session=session@entry=0x1398000, refp=refp@entry=0x7ffc583e06b8, flags=flags@entry=4147)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/btree/bt_walk.c:537
#4  0x00007f7f53935145 in __verbose_dump_cache_single (session=session@entry=0x1398000, total_bytesp=total_bytesp@entry=0x7ffc583e0b70, total_dirty_bytesp=total_dirty_bytesp@entry=0x7ffc583e0b68,
    total_updates_bytesp=total_updates_bytesp@entry=0x7ffc583e0b60) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/evict/evict_lru.c:2658
#5  0x00007f7f5393564a in __verbose_dump_cache_apply (session=session@entry=0x1398000, total_bytesp=total_bytesp@entry=0x7ffc583e0b70, total_dirty_bytesp=total_dirty_bytesp@entry=0x7ffc583e0b68,
    total_updates_bytesp=total_updates_bytesp@entry=0x7ffc583e0b60) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/evict/evict_lru.c:2747
#6  0x00007f7f5393df9e in __wt_verbose_dump_cache (session=session@entry=0x1398000) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/evict/evict_lru.c:2786
#7  0x00007f7f538a8852 in __conn_debug_info (wt_conn=<optimized out>, config=<optimized out>) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/conn/conn_api.c:1259
#8  0x00000000004164c4 in operations (ops_seconds=<optimized out>, ops_seconds@entry=55, run_current=run_current@entry=1, run_total=run_total@entry=3)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/test/format/ops.c:440
#9  0x0000000000419b00 in main (argc=<optimized out>, argv=<optimized out>) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/test/format/t.c:388
(gdb) bt
#0  0x00007f7f53881a84 in __wt_page_release (session=session@entry=0x1398000, ref=ref@entry=0x0, flags=flags@entry=4791)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/include/btree_inline.h:1984
#1  0x00007f7f53881c71 in __wt_page_swap_func (session=session@entry=0x1398000, held=held@entry=0x0, want=want@entry=0x34448c0, flags=4791,
    func=func@entry=0x7f7f53a5f200 <__PRETTY_FUNCTION__.7> "__tree_walk_internal", line=line@entry=467) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/include/btree_inline.h:2219
#2  0x00007f7f5388269f in __tree_walk_internal (session=session@entry=0x1398000, refp=refp@entry=0x7ffc583e06b8, walkcntp=walkcntp@entry=0x0, skip_func=skip_func@entry=0x0,
    func_cookie=func_cookie@entry=0x0, flags=4659, flags@entry=4147) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/btree/bt_walk.c:467
#3  0x00007f7f53882a31 in __wt_tree_walk (session=session@entry=0x1398000, refp=refp@entry=0x7ffc583e06b8, flags=flags@entry=4147)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/btree/bt_walk.c:537
#4  0x00007f7f53935145 in __verbose_dump_cache_single (session=session@entry=0x1398000, total_bytesp=total_bytesp@entry=0x7ffc583e0b70, total_dirty_bytesp=total_dirty_bytesp@entry=0x7ffc583e0b68,
    total_updates_bytesp=total_updates_bytesp@entry=0x7ffc583e0b60) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/evict/evict_lru.c:2658
#5  0x00007f7f5393564a in __verbose_dump_cache_apply (session=session@entry=0x1398000, total_bytesp=total_bytesp@entry=0x7ffc583e0b70, total_dirty_bytesp=total_dirty_bytesp@entry=0x7ffc583e0b68,
    total_updates_bytesp=total_updates_bytesp@entry=0x7ffc583e0b60) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/evict/evict_lru.c:2747
#6  0x00007f7f5393df9e in __wt_verbose_dump_cache (session=session@entry=0x1398000) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/evict/evict_lru.c:2786
#7  0x00007f7f538a8852 in __conn_debug_info (wt_conn=<optimized out>, config=<optimized out>) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/src/conn/conn_api.c:1259
#8  0x00000000004164c4 in operations (ops_seconds=<optimized out>, ops_seconds@entry=55, run_current=run_current@entry=1, run_total=run_total@entry=3)
    at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/test/format/ops.c:440
#9  0x0000000000419b00 in main (argc=<optimized out>, argv=<optimized out>) at /data/mci/62c98552e9e89a878099c264c0ab6a84/wiredtiger/test/format/t.c:388