Prevent eviction of prepared updates during commit

==54435==ERROR: AddressSanitizer: heap-use-after-free on address 0x60b0001d1690 at pc 0x0000007a66b1 bp 0x7f63f49f7830 sp 0x7f63f49f7828

READ of size 8 at 0x60b0001d1690 thread T22

    #0 0x7a66b0 in __txn_commit_timestamps_assert /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:743:32

    #1 0x7a3a4d in __wt_txn_commit /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:867:2

    #2 0x71d63f in __session_commit_transaction /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/session/session_api.c:1725:9

    #3 0x52142f in commit_transaction /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:453:2

    #4 0x51f045 in ops /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1020:4

    #5 0x4dde52 in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) (/work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4dde52)

    #6 0x7f640383536c in start_thread (/lib64/libpthread.so.0+0x736c)

    #7 0x7f6402a09b4e in __GI___clone (/lib64/libc.so.6+0x110b4e)

0x60b0001d1690 is located 0 bytes inside of 101-byte region [0x60b0001d1690,0x60b0001d16f5)

freed by thread T22 here:

    #0 0x4d01e8 in __interceptor_free.localalias.0 (/work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4d01e8)

    #1 0x654929 in __wt_free_int /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_common/os_alloc.c:327:2

    #2 0x860352 in __wt_free_update_list /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_discard.c:444:3

    #3 0x861667 in __free_update /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_discard.c:426:5

    #4 0x85ea9e in __free_page_modify /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_discard.c:211:4

    #5 0x85cecd in __wt_page_out /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_discard.c:112:3

    #6 0x85c1e8 in __wt_ref_out /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_discard.c:44:2

    #7 0x608bd5 in __evict_page_dirty_update /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/evict/evict_page.c:442:5

    #8 0x6038de in __wt_evict /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/evict/evict_page.c:205:3

    #9 0x6021b1 in __wt_page_release_evict /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/evict/evict_page.c:83:8

    #10 0x847f2f in __wt_page_release /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/btree.i:1533:4

    #11 0x8374ab in __cursor_reset /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/cursor.i:216:8

    #12 0x836fd3 in __wt_btcur_reset /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:482:10

    #13 0xa204e1 in __curfile_reset /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_file.c:172:8

    #14 0x5c7e8a in __wt_cursor_cache /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_std.c:599:2

    #15 0xa2cf63 in __curfile_cache /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_file.c:552:2

    #16 0x5c9e60 in __wt_cursor_cache_release /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_std.c:685:2

    #17 0xa2c22d in __curfile_close /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/cursor/cur_file.c:495:9

    #18 0x7a642c in __txn_commit_timestamps_assert /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:731:6

    #19 0x7a3a4d in __wt_txn_commit /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:867:2

    #20 0x71d63f in __session_commit_transaction /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/session/session_api.c:1725:9

    #21 0x52142f in commit_transaction /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:453:2

    #22 0x51f045 in ops /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1020:4

    #23 0x4dde52 in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) (/work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4dde52)

previously allocated by thread T22 here:

    #0 0x4d05a8 in calloc (/work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4d05a8)

    #1 0x653170 in __wt_calloc /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_common/os_alloc.c:52:11

    #2 0x9860c1 in __wt_update_alloc /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/row_modify.c:292:3

    #3 0x8b52c2 in __las_page_instantiate /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:189:3

    #4 0x8b7492 in __page_read_lookaside /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:429:2

    #5 0x8af477 in __page_read /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:563:3

    #6 0x8ac3b6 in __wt_page_in_func /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_read.c:687:4

    #7 0x997cc7 in __wt_page_swap_func /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/include/btree.i:1715:8

    #8 0x99375c in __wt_row_search /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/row_srch.c:463:14

    #9 0x837d01 in __cursor_row_search /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:397:2

    #10 0x837630 in __wt_btcur_search_uncommitted /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/btree/bt_cursor.c:503:2

    #11 0x7a635b in __txn_commit_timestamps_assert /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:728:5

    #12 0x7a3a4d in __wt_txn_commit /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:867:2

    #13 0x71d63f in __session_commit_transaction /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/session/session_api.c:1725:9

    #14 0x52142f in commit_transaction /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:453:2

    #15 0x51f045 in ops /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:1020:4

    #16 0x4dde52 in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) (/work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x4dde52)

Thread T22 created by T0 here:

    #0 0x433890 in pthread_create (/work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/t+0x433890)

    #1 0x670d00 in __wt_thread_create /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/os_posix/os_thread.c:30:2

    #2 0x519857 in wts_ops /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/ops.c:173:3

    #3 0x53428f in main /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/test/format/../../../test/format/t.c:221:5

    #4 0x7f6402919889 in __libc_start_main (/lib64/libc.so.6+0x20889)

SUMMARY: AddressSanitizer: heap-use-after-free /work/jenkins/workspace/wiredtiger-test-format-stress-sanitizer/build_posix/../src/txn/txn.c:743:32 in __txn_commit_timestamps_assert

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

#  RUN PARAMETERS

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

abort=0

alter=0

assert_commit_timestamp=1

assert_read_timestamp=0

auto_throttle=1

backups=1

bitcnt=4

bloom=1

bloom_bit_count=25

bloom_hash_count=20

bloom_oldest=0

cache=100

cache_minimum=20

checkpoints=on

checkpoint_log_size=183

checkpoint_wait=85

checksum=off

chunk_size=8

compaction=0

compression=none

data_extend=0

data_source=file

delete_pct=21

dictionary=0

direct_io=0

encryption=none

evict_max=5

file_type=row-store

firstfit=0

huffman_key=0

huffman_value=0

independent_thread_rng=0

in_memory=0

insert_pct=0

internal_key_truncation=1

internal_page_max=15

isolation=snapshot

key_gap=15

key_max=20

key_min=19

leaf_page_max=9

leak_memory=0

logging=0

logging_archive=0

logging_compression=none

logging_file_max=266694

logging_prealloc=1

long_running_txn=0

lsm_worker_threads=4

memory_page_max=2

merge_max=7

mmap=1

modify_pct=70

ops=0

prefix_compression=1

prefix_compression_min=1

prepare=1

quiet=1

read_pct=9

rebalance=1

repeat_data_pct=18

reverse=0

rows=1000000

runs=1

salvage=1

split_pct=88

statistics=0

statistics_server=1

threads=25

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=2694

value_min=8

verify=1

wiredtiger_config=

write_pct=0

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