collections=1000
threads=1

function checkpoint {
    echo checkpointing
    mongo --quiet --eval "printjson(db.adminCommand({fsync:1}))"
}

function setup {
    killall -w mongod
    rm -rf db; mkdir -p db
    mongod --dbpath db --logpath db.log --fork --storageEngine wiredTiger
    sleep 2
    echo initializing $collections collections
    mongo --quiet --eval "
        for (var i=0; i<$collections; i++)
            db['c'+i].insert({})
    "
    checkpoint
}

function repro {
    (
        for t in $(seq 0 $[$threads-1]); do
            echo inserting $t
            mongo --quiet --eval "
                for (var i=$t; i<$collections; i+=$threads)
                    db['c'+i].insert({})
            " &
        done
        wait
        echo finished inserts
    ) &
    checkpoint &
    wait
    echo finished parallel checkpoint
    checkpoint
    echo finished sequential checkpoint        
}

function check {
    echo checking
    mongo --quiet --eval "
        for (var i=0; i<$collections; i++) {
            try {
                c = db['c'+i]
                n_id = c.find().hint({_id:1}).itcount()
                n_c = c.find().hint({\$natural:1}).itcount()
                if (n_id != n_c)
                    print(i, n_c, n_id, 'OOPS')
            } catch (e) {
                print(i, e)
            }
        }
    "
}

setup
while true; do
    repro
    echo stopping
    killall -w mongod
    echo starting
    mongod --dbpath db --logpath db.log --logappend --fork --storageEngine wiredTiger
    sleep 2
    check
done

27 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
28 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
29 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
30 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
31 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
32 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
33 Error: error: { "$err" : "Didn't find RecordId in WiredTigerRecordStore", "code" : 28556 }
...

2015-03-07T12:53:31.671-0500 E STORAGE  WiredTiger (0) [1425750811:671913][9925:0x7f3a93725700], eviction-server: cache server: exiting with 420 pages in memory and 416 pages evicted
2015-03-07T12:53:31.671-0500 E STORAGE  WiredTiger (0) [1425750811:671962][9925:0x7f3a93725700], eviction-server: cache server: exiting with 1640 bytes in memory
2015-03-07T12:53:31.671-0500 E STORAGE  WiredTiger (0) [1425750811:671976][9925:0x7f3a93725700], eviction-server: cache server: exiting with 1058 bytes dirty and 2 pages dirty

2015-03-07T12:53:35.799-0500 I -        [conn1] Assertion: 28556:Didn't find RecordId in WiredTigerRecordStore