v2v3: TestStoreWatchRecursiveUpdateWithHiddenKey segfaults

[heyitsanthony]

via https://jenkins-etcd-public.prod.coreos.systems/job/etcd-ci-ppc64/2124/console

=== RUN   TestStoreWatchRecursiveUpdateWithHiddenKey
2017-09-06 20:58:15.508705 I | integration: launching 6287598138647832447 (unix://localhost:62875981386478324470)
2017-09-06 20:58:15.511051 I | etcdserver: name = 6287598138647832447
2017-09-06 20:58:15.511097 I | etcdserver: data dir = /tmp/etcd077995243
2017-09-06 20:58:15.511107 I | etcdserver: member dir = /tmp/etcd077995243/member
2017-09-06 20:58:15.511115 I | etcdserver: heartbeat = 10ms
2017-09-06 20:58:15.511124 I | etcdserver: election = 100ms
2017-09-06 20:58:15.511132 I | etcdserver: snapshot count = 0
2017-09-06 20:58:15.511143 I | etcdserver: advertise client URLs = unix://127.0.0.1:2107018208
2017-09-06 20:58:15.511153 I | etcdserver: initial advertise peer URLs = unix://127.0.0.1:2106918208
2017-09-06 20:58:15.511169 I | etcdserver: initial cluster = 6287598138647832447=unix://127.0.0.1:2106918208
2017-09-06 20:58:15.514189 I | etcdserver: starting member a19c32ef5bf61574 in cluster 6f0455260632fa05
2017-09-06 20:58:15.514214 I | raft: a19c32ef5bf61574 became follower at term 0
2017-09-06 20:58:15.514228 I | raft: newRaft a19c32ef5bf61574 [peers: [], term: 0, commit: 0, applied: 0, lastindex: 0, lastterm: 0]
2017-09-06 20:58:15.514238 I | raft: a19c32ef5bf61574 became follower at term 1
2017-09-06 20:58:15.517533 W | auth: simple token is not cryptographically signed
2017-09-06 20:58:15.520824 I | etcdserver: set snapshot count to default 100000
2017-09-06 20:58:15.520847 I | etcdserver: starting server... [version: 3.2.0+git, cluster version: to_be_decided]
2017-09-06 20:58:15.521392 I | integration: launched 6287598138647832447 (unix://localhost:62875981386478324470)
2017-09-06 20:58:15.521484 I | etcdserver/membership: added member a19c32ef5bf61574 [unix://127.0.0.1:2106918208] to cluster 6f0455260632fa05
2017-09-06 20:58:15.604495 I | raft: a19c32ef5bf61574 is starting a new election at term 1
2017-09-06 20:58:15.604544 I | raft: a19c32ef5bf61574 became candidate at term 2
2017-09-06 20:58:15.604560 I | raft: a19c32ef5bf61574 received MsgVoteResp from a19c32ef5bf61574 at term 2
2017-09-06 20:58:15.604582 I | raft: a19c32ef5bf61574 became leader at term 2
2017-09-06 20:58:15.604596 I | raft: raft.node: a19c32ef5bf61574 elected leader a19c32ef5bf61574 at term 2
2017-09-06 20:58:15.605016 I | etcdserver: published {Name:6287598138647832447 ClientURLs:[unix://127.0.0.1:2107018208]} to cluster 6f0455260632fa05
2017-09-06 20:58:15.605067 I | etcdserver: setting up the initial cluster version to 3.2
2017-09-06 20:58:15.605677 N | etcdserver/membership: set the initial cluster version to 3.2
2017-09-06 20:58:15.611403 I | integration: terminating 6287598138647832447 (unix://localhost:62875981386478324470)
2017-09-06 20:58:15.611587 I | etcdserver/api/v3rpc: transport: http2Server.HandleStreams failed to read frame: read unix localhost:6287598138647832447->@: read: connection reset by peer
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x33ac8c]

goroutine 2930 [running]:
github.com/coreos/bbolt.(*Tx).Bucket(0x0, 0xe30296, 0x3, 0x3, 0xead160)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/bbolt/tx.go:101 +0x24
github.com/coreos/etcd/mvcc/backend.(*readTx).UnsafeRange(0xc4204d78b0, 0xe30296, 0x3, 0x3, 0xc42019b840, 0x11, 0x12, 0x0, 0x0, 0x0, ...)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/mvcc/backend/read_tx.go:75 +0x4b0
github.com/coreos/etcd/mvcc.(*storeTxnRead).rangeKeys(0xc42040de30, 0xc4201b13e0, 0x8, 0x8, 0x0, 0x0, 0x0, 0x3, 0x0, 0x2, ...)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/mvcc/kvstore_txn.go:140 +0x30c
github.com/coreos/etcd/mvcc.(*storeTxnRead).Range(0xc42040de30, 0xc4201b13e0, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0, 0x2, 0x0, ...)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/mvcc/kvstore_txn.go:45 +0x80
github.com/coreos/etcd/mvcc.(*txnReadWrite).Range(0xc4201b1750, 0xc4201b13e0, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0, 0x2, 0x4dbd00, ...)
	<autogenerated>:30 +0xac
github.com/coreos/etcd/mvcc.(*metricsTxnWrite).Range(0xc42040de60, 0xc4201b13e0, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0, 0x2, 0x0, ...)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/mvcc/metrics_txn.go:38 +0x94
github.com/coreos/etcd/mvcc.(*readView).Range(0xc420014b70, 0xc4201b13e0, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0, 0x2, 0xc4201d0700, ...)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/mvcc/kv_view.go:38 +0xe4
github.com/coreos/etcd/mvcc.(*watchableStore).Range(0xc420090280, 0xc4201b13e0, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0, 0x2, 0x0, ...)
	<autogenerated>:116 +0xb0
github.com/coreos/etcd/etcdserver/api/v3rpc.(*serverWatchStream).sendLoop(0xc4201d06e0)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/etcdserver/api/v3rpc/watch.go:317 +0x69c
github.com/coreos/etcd/etcdserver/api/v3rpc.(*watchServer).Watch.func1(0xc4201d06e0)
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/etcdserver/api/v3rpc/watch.go:133 +0x2c
created by github.com/coreos/etcd/etcdserver/api/v3rpc.(*watchServer).Watch
	/var/jenkins_home/workspace/etcd-ci-ppc64/gopath/src/github.com/coreos/etcd/etcdserver/api/v3rpc/watch.go:135 +0x20c
exit status 2
FAIL	github.com/coreos/etcd/store	2.988s

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