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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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13
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Storage Engines 2019-10-21, Storage Engines 2019-11-04, Storage Engines 2019-11-18, Storage Engines 2019-12-02, Storage Engines 2019-12-16, Storage Engines 2019-12-30, Storage Engines 2020-01-13
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v4.2, v4.0, v3.6
Summary:
Fix a race in reconciliation that could lead to the return of an incorrect value.
A snapshot-isolation search mismatch failure was captured by the stress sanitizer job against mongodb-4.2 branch on tinderbox.
http://build.wiredtiger.com:8080/job/wiredtiger-test-format-stress-sanitizer-old-branches/1674/
++ nice ./t
snapshot-isolation error: Dumping page to RUNDIR/pagedump
snapshot-isolation 0000042405.00/opqrstuvwxyzabcdefg search mismatch
expected {0000042405}
found {}
t: process 8818
(...)
t: FAILED: snapshot-isolation: 0000042405.00/opqrstuvwxyzabcdefg search mismatch
process aborting
/tmp/jenkins4811282508003293818.sh: line 37: 8818 Aborted (core dumped) nice ./t
+ cleanup
+ status=134
The stack trace:
(gdb) bt #0 0x00007f06087a19fb in raise () from /lib64/libc.so.6 #1 0x00007f06087a3800 in abort () from /lib64/libc.so.6 #2 0x0000000000546d67 in testutil_die (e=0, fmt=0xc735e0 <.str.20> "snapshot-isolation: %.*s search mismatch") at ../../../test/utility/misc.c:66 #3 0x0000000000531554 in snap_verify (cursor=0x61800000dc80, tinfo=0x62f00009a400, snap=0x62f0000a3d90) at ../../../test/format/snap.c:220 #4 0x000000000052fbc7 in snap_repeat_txn (cursor=0x61800000dc80, tinfo=0x62f00009a400) at ../../../test/format/snap.c:388 #5 0x000000000051edeb in ops (arg=0x62f00009a400) at ../../../test/format/ops.c:949 #6 0x00000000004dde53 in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) () #7 0x00007f06096a736d in start_thread () from /lib64/libpthread.so.0 #8 0x00007f060887bb4f in clone () from /lib64/libc.so.6
The configuration:
############################################ # RUN PARAMETERS ############################################ abort=0 alter=0 assert_commit_timestamp=0 assert_read_timestamp=0 auto_throttle=1 backups=0 bitcnt=4 bloom=1 bloom_bit_count=38 bloom_hash_count=9 bloom_oldest=0 cache=70 cache_minimum=0 checkpoints=on checkpoint_log_size=52 checkpoint_wait=27 checksum=uncompressed chunk_size=7 compaction=0 compression=none data_extend=0 data_source=table delete_pct=2 dictionary=0 direct_io=0 encryption=none evict_max=1 file_type=row-store firstfit=0 huffman_key=0 huffman_value=0 independent_thread_rng=1 in_memory=0 insert_pct=3 internal_key_truncation=1 internal_page_max=9 isolation=snapshot key_gap=3 key_max=35 key_min=32 leaf_page_max=12 leak_memory=0 logging=0 logging_archive=0 logging_compression=none logging_file_max=403863 logging_prealloc=1 long_running_txn=0 lsm_worker_threads=4 memory_page_max=7 merge_max=9 mmap=1 modify_pct=50 ops=100000 prefix_compression=1 prefix_compression_min=6 prepare=0 quiet=1 read_pct=34 rebalance=1 repeat_data_pct=68 reverse=0 rows=100000 runs=1 salvage=1 split_pct=60 statistics=1 statistics_server=0 threads=5 timer=360 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=1087 value_min=8 verify=1 wiredtiger_config= write_pct=11 ############################################