Test format stress failure - null page

  87: file, variable-length column-store

[1414428305:327979][11512300f7ffc70b7f0000], t, file:wt-000028.lsm, lsm-worker: ../src/btree/bt_page.c, 116: page != NULL

[1414428305:328015][11512300f7ffc70b7f0000], t, file:wt-000028.lsm, lsm-worker: aborting WiredTiger library

*** Aborted

############################################

#  RUN PARAMETERS

############################################

auto_throttle=1

firstfit=0

bitcnt=6

bloom=1

bloom_bit_count=39

bloom_hash_count=26

bloom_oldest=0

cache=60

checkpoints=1

checksum=off

chunk_size=2

compaction=0

compression=none

data_extend=0

data_source=lsm

delete_pct=25

dictionary=0

evict_max=5

file_type=row-store

backups=0

huffman_key=0

huffman_value=0

insert_pct=74

internal_key_truncation=1

internal_page_max=15

isolation=snapshot

key_gap=12

key_max=27

key_min=14

leak_memory=0

leaf_page_max=9

logging=0

lsm_worker_threads=3

merge_max=20

mmap=1

ops=100000

prefix_compression=1

prefix_compression_min=2

repeat_data_pct=72

reverse=0

rows=100000

runs=100

split_pct=40

statistics=0

threads=31

value_max=1067

value_min=1

wiredtiger_config=

write_pct=10

############################################

Thread 2 (Thread 0x7f0bd61a1700 (LWP 94083)):

#0  0x00000000004c61ff in __wt_page_hazard_check (session=0xd206a0, page=0x7f0bb8036130) at ../src/include/btree.i:1049

WT-1  0x00000000004c63a6 in __wt_page_out (session=0xd206a0, pagep=0x1908fe0) at ../src/btree/bt_discard.c:72

WT-2  0x00000000004c62a2 in __wt_ref_out (session=0xd206a0, ref=0x1908fe0) at ../src/btree/bt_discard.c:32

WT-3  0x000000000047147d in __rec_page_clean_update (session=0xd206a0, ref=0x1908fe0) at ../src/btree/rec_evict.c:126

WT-4  0x000000000047123d in __wt_rec_evict (session=0xd206a0, ref=0x1908fe0, exclusive=0) at ../src/btree/rec_evict.c:80

WT-5  0x0000000000462bbc in __wt_evict_page (session=0xd206a0, ref=0x1908fe0) at ../src/btree/bt_evict.c:618

WT-6  0x00000000004706ce in __wt_page_release (session=0xd206a0, ref=0x1908fe0, flags=8) at ../src/include/btree.i:960

WT-7  0x00000000004707fc in __wt_page_swap_func (session=0xd206a0, held=0x1908fe0, want=0x1909020, flags=8, file=0x676659 "../src/btree/bt_walk.c", line=249)

    at ../src/include/btree.i:1011

WT-8  0x0000000000470ce4 in __wt_tree_walk (session=0xd206a0, refp=0x7f0bb8445a98, flags=8) at ../src/btree/bt_walk.c:249

WT-9  0x00000000004bb86a in __wt_btcur_next (cbt=0x7f0bb8445960, truncating=0) at ../src/btree/bt_curnext.c:458

WT-10 0x00000000004933b4 in __curfile_next (cursor=0x7f0bb8445960) at ../src/cursor/cur_file.c:79

WT-11 0x00000000004a8016 in __clsm_next (cursor=0x7f0bb8082a00) at ../src/lsm/lsm_cursor.c:826

WT-12 0x00000000004ac6b3 in __wt_lsm_merge (session=0xd206a0, lsm_tree=0xeaeb70, id=2) at ../src/lsm/lsm_merge.c:311

WT-13 0x00000000004323eb in __lsm_worker (arg=0xd52160) at ../src/lsm/lsm_worker.c:137

WT-14 0x0000003f17e07ee5 in start_thread (arg=0x7f0bd61a1700) at pthread_create.c:309

Thread 1 (Thread 0x7f0bc7fff700 (LWP 94082)):

WT-3  0x000000000044e790 in __wt_assert (session=0xd20420, error=0, file_name=0x6831b8 "../src/btree/bt_page.c", line_number=116, fmt=0x683192 "%s")

    at ../src/support/err.c:447

WT-4  0x00000000004ce301 in __wt_page_in_func (session=0xd20420, ref=0x18f8970, flags=640, file=0x676659 "../src/btree/bt_walk.c", line=249)

    at ../src/btree/bt_page.c:116

WT-5  0x00000000004707a4 in __wt_page_swap_func (session=0xd20420, held=0x7f0bb00e1da8, want=0x18f8970, flags=640, file=0x676659 "../src/btree/bt_walk.c", 

    line=249) at ../src/include/btree.i:995

WT-6  0x0000000000470ce4 in __wt_tree_walk (session=0xd20420, refp=0x7f0bc7ffeb78, flags=640) at ../src/btree/bt_walk.c:249

WT-7  0x000000000046b472 in __evict_file (session=0xd20420, syncop=4) at ../src/btree/bt_sync.c:221

WT-8  0x000000000046b77f in __wt_cache_op (session=0xd20420, ckptbase=0x0, op=4) at ../src/btree/bt_sync.c:354

WT-9  0x00000000004568de in __wt_checkpoint_close (session=0xd20420, force=0) at ../src/txn/txn_ckpt.c:931

WT-10 0x000000000048ad27 in __wt_conn_btree_sync_and_close (session=0xd20420, force=0) at ../src/conn/conn_dhandle.c:210

WT-11 0x000000000048b907 in __wt_conn_dhandle_close_all (session=0xd20420, name=0x7f0bb000d5c0 "file:wt-000028.lsm", force=0) at ../src/conn/conn_dhandle.c:546

WT-12 0x0000000000441375 in __drop_file (session=0xd20420, uri=0x7f0bb000d5c0 "file:wt-000028.lsm", force=0, cfg=0x7f0bc7ffedd0) at ../src/schema/schema_drop.c:31

WT-13 0x00000000004419af in __wt_schema_drop (session=0xd20420, uri=0x7f0bb000d5c0 "file:wt-000028.lsm", cfg=0x7f0bc7ffedd0) at ../src/schema/schema_drop.c:174

WT-14 0x00000000004aff63 in __lsm_drop_file (session=0xd20420, uri=0x7f0bb000d5c0 "file:wt-000028.lsm") at ../src/lsm/lsm_work_unit.c:481

WT-15 0x00000000004b01e5 in __wt_lsm_free_chunks (session=0xd20420, lsm_tree=0xeaeb70) at ../src/lsm/lsm_work_unit.c:571

WT-16 0x00000000004321f5 in __lsm_worker_general_op (session=0xd20420, cookie=0xd52138, completed=0x7f0bc7ffeee0) at ../src/lsm/lsm_worker.c:71

WT-17 0x0000000000432313 in __lsm_worker (arg=0xd52138) at ../src/lsm/lsm_worker.c:121

WT-18 0x0000003f17e07ee5 in start_thread (arg=0x7f0bc7fff700) at pthread_create.c:309

(gdb) p *ref

$2 = {page = 0x0, home = 0xebb670, ref_hint = 0, state = WT_REF_MEM, addr = 0x18f8a2a, key = {recno = 4294967379, ikey = 0x100000053}, page_del = 0x0}