Backtrace:
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/include/gcc.h:133(__wt_atomic_fetch_add16)[0x437a67]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/btree/bt_ovfl.c:251(__wt_ovfl_discard)[0x47828a]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/btree/bt_split.c:1152(__split_parent)[0x483a2e]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/btree/bt_split.c:965(__split_parent_unlock)[0x485bab]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/evict/evict_page.c:163(__evict_reverse_split_check)[0x421695]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/evict/evict_file.c:95(__wt_evict_file)[0x4b4acf]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/btree/bt_sync.c:262(__wt_cache_op)[0x48827a]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/conn/conn_dhandle.c:198(__wt_conn_btree_sync_and_close)[0x49f157]
/mnt/fast/jenkins/workspace/wiredtiger-test-format/build_posix/../src/conn/conn_sweep.c:178(__sweep_discard_trees)[0x41783f]
/lib64/libpthread.so.0(+0x7df3)[0x7f9289f71df3]
/lib64/libc.so.6(clone+0x6d)[0x7f9289c9f1ad]

############################################
#  RUN PARAMETERS
############################################
abort=0
auto_throttle=1
firstfit=0
bitcnt=4
bloom=1
bloom_bit_count=39
bloom_hash_count=4
bloom_oldest=0
cache=300
checkpoints=1
checksum=uncompressed
chunk_size=10
compaction=0
compression=none
data_extend=0
data_source=lsm
delete_pct=24
dictionary=0
encryption=rotn-7
evict_max=0
file_type=row-store
backups=0
huffman_key=0
huffman_value=0
insert_pct=60
internal_key_truncation=0
internal_page_max=9
isolation=snapshot
key_gap=19
key_max=68
key_min=31
leak_memory=0
leaf_page_max=11
logging=0
logging_compression=none
logging_archive=1
logging_prealloc=1
long_running_txn=0
lsm_worker_threads=4
merge_max=12
mmap=1
ops=1000
prefix_compression=1
prefix_compression_min=6
repeat_data_pct=8
reverse=0
rows=10000
runs=50
salvage=1
split_pct=81
statistics=1
statistics_server=0
threads=1
timer=20
value_max=1356
value_min=5
verify=1
wiredtiger_config=
write_pct=87
############################################