test/format failure illegal WT_REF.state rolling back deleted page

[1519291893:109358][15106:0x3ff68fff910], t, WT_SESSION.rollback_transaction: illegal WT_REF.state rolling back deleted page: encountered an illegal file format or internal value: (__wt_delete_page_rollback, 237)

[1519291893:109540][15106:0x3ff68fff910], t, WT_SESSION.rollback_transaction: the process must exit and restart: WT_PANIC: WiredTiger library panic

[1519291893:109552][15106:0x3ff68fff910], t, WT_SESSION.rollback_transaction: aborting WiredTiger library

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

#  RUN PARAMETERS

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

abort=0

alter=0

auto_throttle=1

backups=0

bitcnt=7

bloom=1

bloom_bit_count=52

bloom_hash_count=18

bloom_oldest=0

cache=25

cache_minimum=20

checkpoints=wiredtiger

checkpoint_log_size=137

checkpoint_wait=82

checksum=uncompressed

chunk_size=8

compaction=1

compression=snappy

data_extend=0

data_source=table

delete_pct=27

dictionary=0

direct_io=0

encryption=none

evict_max=4

file_type=row-store

firstfit=0

huffman_key=0

huffman_value=0

independent_thread_rng=1

in_memory=0

insert_pct=21

internal_key_truncation=1

internal_page_max=13

isolation=snapshot

key_gap=4

key_max=47

key_min=10

leaf_page_max=15

leak_memory=0

logging=1

logging_archive=1

logging_compression=lz4

logging_file_max=286166

logging_prealloc=0

long_running_txn=0

lsm_worker_threads=3

merge_max=7

mmap=1

modify_pct=26

ops=100000

prefix_compression=1

prefix_compression_min=6

quiet=1

read_pct=19

rebalance=1

repeat_data_pct=54

reverse=0

rows=100000

runs=100

salvage=1

split_pct=81

statistics=0

statistics_server=0

threads=25

timer=360

transaction_timestamps=0

transaction-frequency=33

truncate=1

value_max=3430

value_min=0

verify=1

wiredtiger_config=

write_pct=7

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

t: FAILED: read_row_worker/1164: cursor->get_value(cursor, value): WT_PANIC: WiredTiger library panic