diff -r 26a682609ac2 vt/pack.go
--- a/vt/pack.go	Tue Apr 24 12:03:56 2012 -0600
+++ b/vt/pack.go	Wed Jun 19 21:24:46 2013 +0300
@@ -6,8 +6,10 @@
 
 //import "log"
 
+const VtCorruptType = 0xFF
+
 const (
-	Overrtype	= 0
+	Overrtype = iota
 	Ovroottype
 	Ovdirtype
 	Ovptype0
@@ -44,8 +46,8 @@
 	Ovroottype,
 }
 
-var fromdisk = [...]int{
-	-1,
+var fromdisk = [...]uint8{
+	VtCorruptType,
 	RBlock,
 	DirBlock,
 	DirBlock + 1,
@@ -55,33 +57,33 @@
 	DirBlock + 5,
 	DirBlock + 6,
 	DirBlock + 7,
-	-1,
-	-1,
-	-1,
+	VtCorruptType,
+	VtCorruptType,
+	VtCorruptType,
 	DataBlock,
 }
 
 var Epacket *Error = &Error{"invalid packet"}
 var Eblktype *Error = &Error{"invalid block type"}
 
-func fromDiskType(val uint8) int {
+func fromDiskType(val uint8) uint8 {
 	if int(val) > len(fromdisk) {
-		return -1
+		return VtCorruptType
 	}
 
 	return fromdisk[val]
 }
 
-func toDiskType(val uint8) int {
+func toDiskType(val uint8) uint8 {
 	if int(val) > len(todisk) {
-		return -1
+		return VtCorruptType
 	}
 
-	return int(todisk[val])
+	return todisk[val]
 }
 
 func PackCall(buf []byte, id uint8, tag uint8, size int) (int, []byte) {
-	size += 2 + 1 + 1	// size[2] id[1] tag[1]
+	size += 2 + 1 + 1 // size[2] id[1] tag[1]
 	if len(buf) < size {
 		return -1, nil
 	}
@@ -108,7 +110,7 @@
 
 func PackThello(buf []byte, tag uint8, version, uid string, strength uint8, crypto, codec []byte) int {
 	sz, buf := PackCall(buf, Thello, tag,
-		7+len(version)+len(uid)+len(crypto)+len(codec))	// vesion[s] uid[s] strength[1] crypto[n] codec[n]
+		7+len(version)+len(uid)+len(crypto)+len(codec)) // vesion[s] uid[s] strength[1] crypto[n] codec[n]
 	if buf == nil {
 		return -1
 	}
@@ -127,13 +129,13 @@
 }
 
 func PackTread(buf []byte, tag uint8, score Score, btype uint8, count uint16) int {
-	sz, buf := PackCall(buf, Tread, tag, Scoresize+1+1+2)	// score[20] type[1] pad[1] count[2]
+	sz, buf := PackCall(buf, Tread, tag, Scoresize+1+1+2) // score[20] type[1] pad[1] count[2]
 	if buf == nil {
 		return -1
 	}
 
 	buf = Pscore(score, buf)
-	buf = Pint8(uint8(toDiskType(btype)), buf)
+	buf = Pint8(toDiskType(btype), buf)
 	buf = Pint8(0, buf)
 	Pint16(count, buf)
 
@@ -141,12 +143,12 @@
 }
 
 func PackTwrite(buf []byte, tag uint8, btype uint8, data []byte) int {
-	sz, buf := PackCall(buf, Twrite, tag, 1+3+len(data))	// type[1] pad[3] data
+	sz, buf := PackCall(buf, Twrite, tag, 1+3+len(data)) // type[1] pad[3] data
 	if buf == nil {
 		return -1
 	}
 
-	buf = Pint8(uint8(toDiskType(btype)), buf)
+	buf = Pint8(toDiskType(btype), buf)
 	buf = Pint8(0, buf)
 	buf = Pint16(0, buf)
 	copy(buf, data)
diff -r 26a682609ac2 vt/vtclnt/clnt.go
--- a/vt/vtclnt/clnt.go	Tue Apr 24 12:03:56 2012 -0600
+++ b/vt/vtclnt/clnt.go	Wed Jun 19 21:24:46 2013 +0300
@@ -279,7 +279,8 @@
 
 				pos += n
 				nreqs++
-				clnt.ReqFree(req)
+				// req is freed in recv() if no Done channel was registered, or by the code calling <-Done.
+				//clnt.ReqFree(req)
 				select {
 				default:
 					req = nil
@@ -355,7 +356,7 @@
 	clnt = NewClnt(c)
 	req := clnt.ReqAlloc()
 	req.Done = make(chan *Req)
-	tc := req.Tc
+	tc := &req.Tc
 	tc.Id = vt.Thello
 	tc.Version = "02"
 	tc.Uid = "anonymous"
@@ -411,7 +412,7 @@
 func (clnt *Clnt) Getnb(score vt.Score, btype uint8, count uint16, done chan *Req) (err *vt.Error) {
 	req := clnt.ReqAlloc()
 	req.Done = done
-	tc := req.Tc
+	tc := &req.Tc
 	tc.Id = vt.Tread
 	tc.Score = score
 	tc.Btype = btype
@@ -447,7 +448,7 @@
 // Put is always async, Sync will make sure all Puts finished before returning
 func (clnt *Clnt) Put(btype uint8, data []byte) (score vt.Score, err *vt.Error) {
 	req := clnt.ReqAlloc()
-	tc := req.Tc
+	tc := &req.Tc
 	tc.Id = vt.Twrite
 	tc.Btype = btype
 	tc.Data = data
@@ -466,7 +467,7 @@
 	done := make(chan *Req)
 	req := clnt.ReqAlloc()
 	req.Done = done
-	tc := req.Tc
+	tc := &req.Tc
 	tc.Id = vt.Tsync
 	err = clnt.Rpcnb(req)
 	if err != nil {