==5717==ERROR: AddressSanitizer: heap-use-after-free on address 0x604005457d75 at pc 0x000000a23e1b bp 0x7fa82e4e3750 sp 0x7fa82e4e3748
READ of size 1 at 0x604005457d75 thread T18
    #0 0xa23e1a in __wt_txn_upd_visible_type /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/txn.i:778:9
    #1 0xa23cbc in __wt_txn_upd_visible /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/txn.i:803:13
    #2 0xa1f6ad in __wt_txn_update_check /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/txn.i:1057:28
    #3 0xa1dd56 in __wt_row_modify /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/row_modify.c:91:13
    #4 0x8f92e6 in __cursor_row_modify /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:422:7
    #5 0x8fb47b in __wt_btcur_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:1030:42
    #6 0xac7cef in __curfile_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_file.c:397:5
    #7 0x52fabd in row_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1730:15
    #8 0x527638 in ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:809:23
    #9 0x4e8ede in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4e8ede)
    #10 0x7fa83b1196da in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76da)
    #11 0x7fa83a24b88e in clone /build/glibc-OTsEL5/glibc-2.27/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95

0x604005457d75 is located 37 bytes inside of 38-byte region [0x604005457d50,0x604005457d76)
freed by thread T19 here:
    #0 0x4db0e0 in __interceptor_free.localalias.0 (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4db0e0)
    #1 0x6b22e8 in __wt_free_int /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_common/os_alloc.c:302:5
    #2 0x91c156 in __wt_free_update_list /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_discard.c:427:9
    #3 0xa215bd in __wt_update_serial /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/serial.i:293:9
    #4 0xa1e1e3 in __wt_row_modify /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/row_modify.c:123:9
    #5 0x8f92e6 in __cursor_row_modify /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:422:7
    #6 0x8fb47b in __wt_btcur_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:1030:42
    #7 0xac7cef in __curfile_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_file.c:397:5
    #8 0x52fabd in row_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1730:15
    #9 0x527638 in ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:809:23
    #10 0x4e8ede in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4e8ede)

previously allocated by thread T9 here:
    #0 0x4db4d8 in calloc (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4db4d8)
    #1 0x6b0a7a in __wt_calloc /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_common/os_alloc.c:50:14
    #2 0xa1ff3c in __wt_update_alloc /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/row_modify.c:271:9
    #3 0x95fe69 in __las_page_instantiate /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:178:9
    #4 0x961ec2 in __page_read_lookaside /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:404:5
    #5 0x959d4b in __page_read /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:530:9
    #6 0x956a8c in __wt_page_in_func /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:644:13
    #7 0xa324ce in __wt_page_swap_func /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/btree.i:1637:11
    #8 0xa2dd63 in __wt_row_search /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/row_srch.c:437:20
    #9 0x8f2471 in __cursor_row_search /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:376:5
    #10 0x8fb5c0 in __wt_btcur_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:1053:15
    #11 0xac7cef in __curfile_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_file.c:397:5
    #12 0x52fabd in row_remove /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1730:15
    #13 0x527638 in ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:809:23
    #14 0x4e8ede in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4e8ede)

Thread T18 created by T0 here:
    #0 0x434480 in pthread_create (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x434480)
    #1 0x6cf965 in __wt_thread_create /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_posix/os_thread.c:28:5
    #2 0x5233d0 in wts_ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:170:9
    #3 0x53ef5f in main /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/t.c:213:17
    #4 0x7fa83a14bb96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

Thread T19 created by T0 here:
    #0 0x434480 in pthread_create (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x434480)
    #1 0x6cf965 in __wt_thread_create /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_posix/os_thread.c:28:5
    #2 0x5233d0 in wts_ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:170:9
    #3 0x53ef5f in main /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/t.c:213:17
    #4 0x7fa83a14bb96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

Thread T9 created by T0 here:
    #0 0x434480 in pthread_create (/mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x434480)
    #1 0x6cf965 in __wt_thread_create /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_posix/os_thread.c:28:5
    #2 0x5233d0 in wts_ops /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:170:9
    #3 0x53ef5f in main /mnt/data0/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/t.c:213:17
    #4 0x7fa83a14bb96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

############################################
#  RUN PARAMETERS
############################################
abort=0
alter=0
assert_commit_timestamp=1
assert_read_timestamp=0
auto_throttle=1
backups=1
bitcnt=7
bloom=1
bloom_bit_count=5
bloom_hash_count=28
bloom_oldest=0
cache=620
cache_minimum=20
checkpoints=wiredtiger
checkpoint_log_size=71
checkpoint_wait=59
checksum=on
chunk_size=10
compaction=0
compression=none
data_extend=0
data_source=table
delete_pct=33
dictionary=0
direct_io=0
encryption=none
evict_max=2
file_type=row-store
firstfit=0
huffman_key=0
huffman_value=0
independent_thread_rng=0
in_memory=0
insert_pct=25
internal_key_truncation=1
internal_page_max=12
isolation=snapshot
key_gap=5
key_max=28
key_min=14
leaf_page_max=10
leak_memory=0
logging=0
logging_archive=0
logging_compression=none
logging_file_max=436785
logging_prealloc=1
long_running_txn=0
lsm_worker_threads=3
memory_page_max=10
merge_max=15
mmap=1
modify_pct=22
ops=0
prefix_compression=0
prefix_compression_min=1
prepare=0
quiet=1
read_pct=16
rebalance=1
repeat_data_pct=27
reverse=1
rows=1000000
runs=1
salvage=1
split_pct=98
statistics=0
statistics_server=0
threads=31
timer=4
timing_stress_aggressive_sweep=0
timing_stress_checkpoint=0
timing_stress_lookaside_sweep=0
timing_stress_split_1=0
timing_stress_split_2=0
timing_stress_split_3=0
timing_stress_split_4=0
timing_stress_split_5=0
timing_stress_split_6=0
timing_stress_split_7=0
timing_stress_split_8=0
transaction_timestamps=1
transaction-frequency=100
truncate=1
value_max=883
value_min=2
verify=1
wiredtiger_config=
write_pct=4
############################################