There was an automated test failure with the symptom:
28: table, row-store (158 seconds) [1508303775:986736][17441:0x3fff82fff1b0], t, WT_SESSION.commit_transaction: commit timestamp 56bd4 older than oldest timestamp: Invalid argument [1508303775:986799][17441:0x3fffa4fff1b0], t, WT_SESSION.commit_transaction: commit timestamp 56bd5 older than oldest timestamp: Invalid argument [1508303775:988035][17441:0x3fff76fff1b0], t, WT_SESSION.commit_transaction: commit timestamp 56bd6 older than oldest timestamp: Invalid argument [1508303775:988156][17441:0x3fff167ff1b0], t, WT_SESSION.commit_transaction: commit timestamp 56bd7 older than oldest timestamp: Invalid argument
Note that the oldest timestamp here is reported as Invalid argument - so maybe this is a startup race in test/format itself. That's made more likely since the failure happened on PPC - which is very parallel slow machine.
The configuration that failed is:
############################################ # RUN PARAMETERS ############################################ abort=0 alter=0 auto_throttle=1 backups=0 bitcnt=2 bloom=0 bloom_bit_count=62 bloom_hash_count=13 bloom_oldest=0 cache=60 checkpoints=on checkpoint_log_size=93 checkpoint_wait=99 checksum=uncompressed chunk_size=2 compaction=0 compression=snappy data_extend=0 data_source=lsm delete_pct=0 dictionary=0 direct_io=0 encryption=none evict_max=0 file_type=row-store firstfit=0 huffman_key=0 huffman_value=0 independent_thread_rng=1 in_memory=0 insert_pct=73 internal_key_truncation=0 internal_page_max=11 isolation=random key_gap=13 key_max=65 key_min=20 leaf_page_max=13 leak_memory=0 logging=0 logging_archive=0 logging_compression=none logging_file_max=227297 logging_prealloc=1 long_running_txn=0 lsm_worker_threads=4 merge_max=4 mmap=1 modify_pct=15 ops=100000 prefix_compression=1 prefix_compression_min=0 quiet=1 read_pct=4 rebalance=1 repeat_data_pct=16 reverse=0 rows=100000 runs=100 salvage=1 split_pct=62 statistics=0 statistics_server=0 threads=26 timer=360 transaction_timestamps=1 transaction-frequency=91 value_max=2634 value_min=18 verify=1 wiredtiger_config= write_pct=8 ############################################
Original failure:
http://build.wiredtiger.com:8080/job/wiredtiger-test-format-stress-ppc/14209/console