test/format segfault in split_deepen

src/btree/bt_split.c:568 (discriminator 2)(__split_deepen)[0x491d4a]

src/btree/bt_split.c:1041(__split_parent)[0x492ccf]

src/btree/bt_split.c:1455(__wt_split_multi)[0x493bc5]

src/evict/evict_page.c:216(__evict_page_dirty_update)[0x42d26f]

src/evict/evict_page.c:118(__wt_evict)[0x42cf1e]

src/evict/evict_lru.c:666(__wt_evict_page)[0x42acd6]

src/evict/evict_lru.c:1394(__wt_evict_lru_page)[0x42c189]

src/evict/evict_lru.c:760 (discriminator 1)(__evict_lru_pages)[0x42aefb]

src/evict/evict_lru.c:396(__evict_worker)[0x42a4ac]

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

#  RUN PARAMETERS

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

abort=0

auto_throttle=1

firstfit=0

bitcnt=4

bloom=1

bloom_bit_count=37

bloom_hash_count=28

bloom_oldest=0

cache=10

checkpoints=1

checksum=uncompressed

chunk_size=4

compaction=0

compression=bzip-raw

data_extend=0

data_source=file

delete_pct=20

dictionary=0

evict_max=3

file_type=row-store

backups=0

huffman_key=0

huffman_value=0

insert_pct=25

internal_key_truncation=1

internal_page_max=11

isolation=read-committed

key_gap=20

key_max=30

key_min=14

leak_memory=0

leaf_page_max=10

logging=0

logging_archive=1

logging_prealloc=0

lsm_worker_threads=3

merge_max=18

mmap=1

ops=100000

prefix_compression=1

prefix_compression_min=6

repeat_data_pct=78

reverse=0

rows=100000

runs=100

split_pct=46

statistics=1

statistics_server=0

threads=11

timer=20

value_max=948

value_min=8

wiredtiger_config=

write_pct=69

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