> sudo mongoreplay record -p /data/playback.bson -i em1
panic: runtime error: slice bounds out of range

goroutine 66 [running]:
panic(0x8ad500, 0xc420010140)
	/opt/go/src/runtime/panic.go:500 +0x1a1
github.com/mongodb/mongo-tools/mongoreplay.(*RawOp).ShortenReply(0xc4232d25a0, 0xc421262240, 0xc42006df18)
	/data/mci/7506acf77b1562807d9a828fda6d1667/src/src/mongo/gotools/.gopath/src/github.com/mongodb/mongo-tools/mongoreplay/raw_op.go:69 +0xd9
github.com/mongodb/mongo-tools/mongoreplay.Record.func1(0xc4212c8000, 0xc4212404c0, 0x7fffc6ac5900, 0xc4212404e0)
	/data/mci/7506acf77b1562807d9a828fda6d1667/src/src/mongo/gotools/.gopath/src/github.com/mongodb/mongo-tools/mongoreplay/record.go:158 +0x2e3
created by github.com/mongodb/mongo-tools/mongoreplay.Record
	/data/mci/7506acf77b1562807d9a828fda6d1667/src/src/mongo/gotools/.gopath/src/github.com/mongodb/mongo-tools/mongoreplay/record.go:172 +0xa2

Similar error recording playback from pcap -

> sudo tcpdump -i em1 -n "port 27017" -w traffic.pcap
> sudo mongoreplay record -f traffic.pcap -p playback.bson
panic: runtime error: slice bounds out of range

goroutine 57 [running]:
panic(0x8b0140, 0xc420012100)
	/opt/go/src/runtime/panic.go:500 +0x1a1
github.com/mongodb/mongo-tools/mongoreplay.(*RawOp).ShortenReply(0xc4226af3b0, 0xc42125e300, 0xc4234edf18)
	/data/mci/c1b6352e0693cc4dfaec9f2148876fca/src/src/mongo/gotools/.gopath/src/github.com/mongodb/mongo-tools/mongoreplay/raw_op.go:69 +0xd9
github.com/mongodb/mongo-tools/mongoreplay.Record.func1(0xc42125e540, 0xc4212524e0, 0x7ffe4e48c700, 0xc421252500)
	/data/mci/c1b6352e0693cc4dfaec9f2148876fca/src/src/mongo/gotools/.gopath/src/github.com/mongodb/mongo-tools/mongoreplay/record.go:158 +0x2e3
created by github.com/mongodb/mongo-tools/mongoreplay.Record
	/data/mci/c1b6352e0693cc4dfaec9f2148876fca/src/src/mongo/gotools/.gopath/src/github.com/mongodb/mongo-tools/mongoreplay/record.go:172 +0xa2