Segfault during connection close in eviction server

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#  RUN PARAMETERS

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abort=0

auto_throttle=1

firstfit=0

bitcnt=2

bloom=1

bloom_bit_count=58

bloom_hash_count=23

bloom_oldest=0

cache=150

checkpoints=1

checksum=uncompressed

chunk_size=5

compaction=0

compression=none

data_extend=0

data_source=lsm

delete_pct=15

dictionary=0

encryption=none

evict_max=2

file_type=row-store

backups=0

huffman_key=0

huffman_value=0

insert_pct=58

internal_key_truncation=0

internal_page_max=12

isolation=read-committed

key_gap=19

key_max=105

key_min=24

leak_memory=0

leaf_page_max=17

logging=1

logging_compression=snappy

logging_archive=0

logging_prealloc=1

long_running_txn=0

lsm_worker_threads=4

merge_max=10

mmap=1

ops=100000

prefix_compression=1

prefix_compression_min=3

repeat_data_pct=23

reverse=0

rows=100000

runs=100

salvage=1

split_pct=83

statistics=0

statistics_server=0

threads=31

timer=20

value_max=3394

value_min=1

verify=1

wiredtiger_config=

write_pct=34

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