Details
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Bug
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Status: Closed
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Major - P3
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Resolution: Fixed
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None
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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
Description
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
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snapshot-isolation error: Dumping page to RUNDIR/pagedump
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snapshot-isolation 0000042405.00/opqrstuvwxyzabcdefg search mismatch
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expected {0000042405}
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found {}
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t: process 8818
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(...)
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t: FAILED: snapshot-isolation: 0000042405.00/opqrstuvwxyzabcdefg search mismatch
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process aborting
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/tmp/jenkins4811282508003293818.sh: line 37: 8818 Aborted (core dumped) nice ./t
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+ cleanup
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+ status=134
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The stack trace:
(gdb) bt
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#0 0x00007f06087a19fb in raise () from /lib64/libc.so.6
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#1 0x00007f06087a3800 in abort () from /lib64/libc.so.6
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#2 0x0000000000546d67 in testutil_die (e=0, fmt=0xc735e0 <.str.20> "snapshot-isolation: %.*s search mismatch") at ../../../test/utility/misc.c:66
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#3 0x0000000000531554 in snap_verify (cursor=0x61800000dc80, tinfo=0x62f00009a400, snap=0x62f0000a3d90) at ../../../test/format/snap.c:220
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#4 0x000000000052fbc7 in snap_repeat_txn (cursor=0x61800000dc80, tinfo=0x62f00009a400) at ../../../test/format/snap.c:388
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#5 0x000000000051edeb in ops (arg=0x62f00009a400) at ../../../test/format/ops.c:949
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#6 0x00000000004dde53 in __asan::AsanThread::ThreadStart(unsigned long, __sanitizer::atomic_uintptr_t*) ()
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#7 0x00007f06096a736d in start_thread () from /lib64/libpthread.so.0
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#8 0x00007f060887bb4f in clone () from /lib64/libc.so.6
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The configuration:
############################################
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# RUN PARAMETERS
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############################################
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abort=0
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alter=0
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assert_commit_timestamp=0
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assert_read_timestamp=0
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auto_throttle=1
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backups=0
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bitcnt=4
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bloom=1
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bloom_bit_count=38
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bloom_hash_count=9
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bloom_oldest=0
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cache=70
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cache_minimum=0
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checkpoints=on
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checkpoint_log_size=52
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checkpoint_wait=27
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checksum=uncompressed
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chunk_size=7
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compaction=0
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compression=none
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data_extend=0
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data_source=table
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delete_pct=2
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dictionary=0
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direct_io=0
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encryption=none
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evict_max=1
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file_type=row-store
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firstfit=0
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huffman_key=0
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huffman_value=0
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independent_thread_rng=1
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in_memory=0
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insert_pct=3
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internal_key_truncation=1
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internal_page_max=9
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isolation=snapshot
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key_gap=3
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key_max=35
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key_min=32
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leaf_page_max=12
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leak_memory=0
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logging=0
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logging_archive=0
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logging_compression=none
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logging_file_max=403863
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logging_prealloc=1
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long_running_txn=0
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lsm_worker_threads=4
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memory_page_max=7
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merge_max=9
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mmap=1
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modify_pct=50
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ops=100000
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prefix_compression=1
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prefix_compression_min=6
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prepare=0
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quiet=1
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read_pct=34
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rebalance=1
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repeat_data_pct=68
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reverse=0
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rows=100000
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runs=1
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salvage=1
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split_pct=60
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statistics=1
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statistics_server=0
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threads=5
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timer=360
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timing_stress_aggressive_sweep=0
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timing_stress_checkpoint=0
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timing_stress_lookaside_sweep=0
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timing_stress_split_1=0
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timing_stress_split_2=0
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timing_stress_split_3=0
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timing_stress_split_4=0
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timing_stress_split_5=0
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timing_stress_split_6=0
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timing_stress_split_7=0
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timing_stress_split_8=0
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transaction_timestamps=1
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transaction-frequency=100
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truncate=1
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value_max=1087
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value_min=8
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verify=1
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wiredtiger_config=
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write_pct=11
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############################################
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