[release-branch.go1.7] go1.7.1

Change-Id: Id877244fba01ae84255ad2d1f6334d096d5d6f71
Reviewed-on: https://go-review.googlesource.com/28694
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

VERSION

@@ -0,0 +1 @@
+go1.7.1

doc/contrib.html

@@ -34,6 +34,7 @@ We encourage all Go users to subscribe to
 <p>A <a href="/doc/devel/release.html">summary</a> of the changes between Go releases. Notes for the major releases:</p>
 
 <ul>
+	<li><a href="/doc/go1.7">Go 1.7</a> <small>(August 2016)</small></li>
 	<li><a href="/doc/go1.6">Go 1.6</a> <small>(February 2016)</small></li>
 	<li><a href="/doc/go1.5">Go 1.5</a> <small>(August 2015)</small></li>
 	<li><a href="/doc/go1.4">Go 1.4</a> <small>(December 2014)</small></li>

doc/devel/release.html

@@ -30,6 +30,25 @@ to fix critical security problems in both Go 1.4 and Go 1.5 as they arise.
 See the <a href="/security">security policy</a> for more details.
 </p>
 
+<h2 id="go1.7">go1.7 (released 2016/08/15)</h2>
+
+<p>
+Go 1.7 is a major release of Go.
+Read the <a href="/doc/go1.7">Go 1.7 Release Notes</a> for more information.
+</p>
+
+<h3 id="go1.7.minor">Minor revisions</h3>
+
+<p>
+go1.7.1 (released 2016/09/07) includes fixes to the compiler, runtime,
+documentation, and the <code>compress/flate</code>, <code>hash/crc32</code>,
+<code>io</code> <code>net</code>, <code>net/http</code>,
+<code>path/filepath</code>, <code>reflect</code>, and <code>syscall</code>
+packages.
+See the <a href="https://github.com/golang/go/issues?q=milestone%3AGo1.7.1">Go
+1.7.1 milestone</a> on our issue tracker for details.
+</p>
+
 <h2 id="go1.6">go1.6 (released 2016/02/17)</h2>
 
 <p>

doc/go1.7.html

@@ -1,5 +1,5 @@
 <!--{
-	"Title": "Go 1.7 Release Notes DRAFT",
+	"Title": "Go 1.7 Release Notes",
 	"Path":  "/doc/go1.7",
 	"Template": true
 }-->
@@ -25,15 +25,6 @@ Do not send CLs removing the interior tags from such phrases.
 ul li { margin: 0.5em 0; }
 </style>
 
-<p>
-<!-- TODO: REMOVE THIS COMMENT -->
-<!-- TODO: Also remove "DRAFT" in the "Title" at the top of this file. -->
-<i>NOTE: This is a DRAFT of the Go 1.7 release notes, prepared for the Go 1.7 beta.
-Go 1.7 has NOT yet been released.
-By our regular schedule, it is expected some time in August 2016.
-</i>
-</p>
-
 <h2 id="introduction">Introduction to Go 1.7</h2>
 
 <p>
@@ -919,7 +910,7 @@ For example, the address on which a request received is
 <p>
 The server's <a href="/pkg/net/http/#Server.Serve"><code>Serve</code></a> method
 now only enables HTTP/2 support if the <code>Server.TLSConfig</code> field is <code>nil</code>
-or includes <code>"h2"</code> in its <code>TLSConfig.NextProto</code>.
+or includes <code>"h2"</code> in its <code>TLSConfig.NextProtos</code>.
 </p>
 
 <p>

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+       style="display:inline;fill:none;fill-rule:evenodd;stroke:#384e54;stroke-width:0.39730874;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       d="m 26.630533,1027.1724 c 1.17043,-1.0835 2.02697,-0.7721 2.04417,-0.7463"
+       id="path4501"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="cc" />
+    <path
+       sodipodi:nodetypes="cc"
+       inkscape:connector-curvature="0"
+       id="path4503"
+       d="m 27.321773,1026.673 c 1.15856,0.036 1.3467,0.6302 1.3388,0.6522"
+       style="display:inline;fill:none;fill-rule:evenodd;stroke:#384e54;stroke-width:0.39730874;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+  </g>
+</svg>

doc/install-source.html

@@ -203,7 +203,7 @@ To build without <code>cgo</code>, set the environment variable
 Change to the directory that will be its parent
 and make sure the <code>go</code> directory does not exist.
 Then clone the repository and check out the latest release tag
-(<code class="versionTag">go1.6</code>, for example):</p>
+(<code class="versionTag">go1.7.1</code>, for example):</p>
 
 <pre>
 $ git clone https://go.googlesource.com/go
@@ -391,7 +391,7 @@ New releases are announced on the
 <a href="//groups.google.com/group/golang-announce">golang-announce</a>
 mailing list.
 Each announcement mentions the latest release tag, for instance,
-<code class="versionTag">go1.6</code>.
+<code class="versionTag">go1.7.1</code>.
 </p>
 
 <p>

src/cmd/compile/internal/ssa/deadstore.go

@@ -14,8 +14,7 @@ func dse(f *Func) {
 	defer f.retSparseSet(loadUse)
 	storeUse := f.newSparseSet(f.NumValues())
 	defer f.retSparseSet(storeUse)
-	shadowed := f.newSparseSet(f.NumValues())
-	defer f.retSparseSet(shadowed)
+	shadowed := newSparseMap(f.NumValues()) // TODO: cache
 	for _, b := range f.Blocks {
 		// Find all the stores in this block. Categorize their uses:
 		//  loadUse contains stores which are used by a subsequent load.
@@ -81,17 +80,18 @@ func dse(f *Func) {
 			shadowed.clear()
 		}
 		if v.Op == OpStore || v.Op == OpZero {
-			if shadowed.contains(v.Args[0].ID) {
+			sz := v.AuxInt
+			if shadowedSize := int64(shadowed.get(v.Args[0].ID)); shadowedSize != -1 && shadowedSize >= sz {
 				// Modify store into a copy
 				if v.Op == OpStore {
 					// store addr value mem
 					v.SetArgs1(v.Args[2])
 				} else {
 					// zero addr mem
-					sz := v.Args[0].Type.ElemType().Size()
-					if v.AuxInt != sz {
+					typesz := v.Args[0].Type.ElemType().Size()
+					if sz != typesz {
 						f.Fatalf("mismatched zero/store sizes: %d and %d [%s]",
-							v.AuxInt, sz, v.LongString())
+							sz, typesz, v.LongString())
 					}
 					v.SetArgs1(v.Args[1])
 				}
@@ -99,7 +99,10 @@ func dse(f *Func) {
 				v.AuxInt = 0
 				v.Op = OpCopy
 			} else {
-				shadowed.add(v.Args[0].ID)
+				if sz > 0x7fffffff { // work around sparseMap's int32 value type
+					sz = 0x7fffffff
+				}
+				shadowed.set(v.Args[0].ID, int32(sz))
 			}
 		}
 		// walk to previous store

src/cmd/compile/internal/ssa/deadstore_test.go

@@ -8,7 +8,7 @@ import "testing"
 
 func TestDeadStore(t *testing.T) {
 	c := testConfig(t)
-	elemType := &TypeImpl{Size_: 8, Name: "testtype"}
+	elemType := &TypeImpl{Size_: 1, Name: "testtype"}
 	ptrType := &TypeImpl{Size_: 8, Ptr: true, Name: "testptr", Elem_: elemType} // dummy for testing
 	fun := Fun(c, "entry",
 		Bloc("entry",
@@ -18,7 +18,7 @@ func TestDeadStore(t *testing.T) {
 			Valu("addr1", OpAddr, ptrType, 0, nil, "sb"),
 			Valu("addr2", OpAddr, ptrType, 0, nil, "sb"),
 			Valu("addr3", OpAddr, ptrType, 0, nil, "sb"),
-			Valu("zero1", OpZero, TypeMem, 8, nil, "addr3", "start"),
+			Valu("zero1", OpZero, TypeMem, 1, nil, "addr3", "start"),
 			Valu("store1", OpStore, TypeMem, 1, nil, "addr1", "v", "zero1"),
 			Valu("store2", OpStore, TypeMem, 1, nil, "addr2", "v", "store1"),
 			Valu("store3", OpStore, TypeMem, 1, nil, "addr1", "v", "store2"),
@@ -95,3 +95,32 @@ func TestDeadStoreTypes(t *testing.T) {
 		t.Errorf("store %s incorrectly removed", v)
 	}
 }
+
+func TestDeadStoreUnsafe(t *testing.T) {
+	// Make sure a narrow store can't shadow a wider one. The test above
+	// covers the case of two different types, but unsafe pointer casting
+	// can get to a point where the size is changed but type unchanged.
+	c := testConfig(t)
+	ptrType := &TypeImpl{Size_: 8, Ptr: true, Name: "testptr"} // dummy for testing
+	fun := Fun(c, "entry",
+		Bloc("entry",
+			Valu("start", OpInitMem, TypeMem, 0, nil),
+			Valu("sb", OpSB, TypeInvalid, 0, nil),
+			Valu("v", OpConstBool, TypeBool, 1, nil),
+			Valu("addr1", OpAddr, ptrType, 0, nil, "sb"),
+			Valu("store1", OpStore, TypeMem, 8, nil, "addr1", "v", "start"),  // store 8 bytes
+			Valu("store2", OpStore, TypeMem, 1, nil, "addr1", "v", "store1"), // store 1 byte
+			Goto("exit")),
+		Bloc("exit",
+			Exit("store2")))
+
+	CheckFunc(fun.f)
+	cse(fun.f)
+	dse(fun.f)
+	CheckFunc(fun.f)
+
+	v := fun.values["store1"]
+	if v.Op == OpCopy {
+		t.Errorf("store %s incorrectly removed", v)
+	}
+}

src/compress/flate/deflate.go

@@ -724,7 +724,7 @@ func (w *Writer) Close() error {
 // the result of NewWriter or NewWriterDict called with dst
 // and w's level and dictionary.
 func (w *Writer) Reset(dst io.Writer) {
-	if dw, ok := w.d.w.w.(*dictWriter); ok {
+	if dw, ok := w.d.w.writer.(*dictWriter); ok {
 		// w was created with NewWriterDict
 		dw.w = dst
 		w.d.reset(dw)

src/compress/flate/deflate_test.go

@@ -6,6 +6,7 @@ package flate
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"internal/testenv"
 	"io"
@@ -631,3 +632,52 @@ func TestBestSpeed(t *testing.T) {
 		}
 	}
 }
+
+var errIO = errors.New("IO error")
+
+// failWriter fails with errIO exactly at the nth call to Write.
+type failWriter struct{ n int }
+
+func (w *failWriter) Write(b []byte) (int, error) {
+	w.n--
+	if w.n == -1 {
+		return 0, errIO
+	}
+	return len(b), nil
+}
+
+func TestWriterPersistentError(t *testing.T) {
+	d, err := ioutil.ReadFile("../testdata/Mark.Twain-Tom.Sawyer.txt")
+	if err != nil {
+		t.Fatalf("ReadFile: %v", err)
+	}
+	d = d[:10000] // Keep this test short
+
+	zw, err := NewWriter(nil, DefaultCompression)
+	if err != nil {
+		t.Fatalf("NewWriter: %v", err)
+	}
+
+	// Sweep over the threshold at which an error is returned.
+	// The variable i makes it such that the ith call to failWriter.Write will
+	// return errIO. Since failWriter errors are not persistent, we must ensure
+	// that flate.Writer errors are persistent.
+	for i := 0; i < 1000; i++ {
+		fw := &failWriter{i}
+		zw.Reset(fw)
+
+		_, werr := zw.Write(d)
+		cerr := zw.Close()
+		if werr != errIO && werr != nil {
+			t.Errorf("test %d, mismatching Write error: got %v, want %v", i, werr, errIO)
+		}
+		if cerr != errIO && fw.n < 0 {
+			t.Errorf("test %d, mismatching Close error: got %v, want %v", i, cerr, errIO)
+		}
+		if fw.n >= 0 {
+			// At this point, the failure threshold was sufficiently high enough
+			// that we wrote the whole stream without any errors.
+			return
+		}
+	}
+}

src/compress/flate/huffman_bit_writer.go

@@ -77,7 +77,11 @@ var offsetBase = []uint32{
 var codegenOrder = []uint32{16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}
 
 type huffmanBitWriter struct {
-	w io.Writer
+	// writer is the underlying writer.
+	// Do not use it directly; use the write method, which ensures
+	// that Write errors are sticky.
+	writer io.Writer
+
 	// Data waiting to be written is bytes[0:nbytes]
 	// and then the low nbits of bits.
 	bits            uint64
@@ -96,7 +100,7 @@ type huffmanBitWriter struct {
 
 func newHuffmanBitWriter(w io.Writer) *huffmanBitWriter {
 	return &huffmanBitWriter{
-		w:               w,
+		writer:          w,
 		literalFreq:     make([]int32, maxNumLit),
 		offsetFreq:      make([]int32, offsetCodeCount),
 		codegen:         make([]uint8, maxNumLit+offsetCodeCount+1),
@@ -107,7 +111,7 @@ func newHuffmanBitWriter(w io.Writer) *huffmanBitWriter {
 }
 
 func (w *huffmanBitWriter) reset(writer io.Writer) {
-	w.w = writer
+	w.writer = writer
 	w.bits, w.nbits, w.nbytes, w.err = 0, 0, 0, nil
 	w.bytes = [bufferSize]byte{}
 }
@@ -129,11 +133,21 @@ func (w *huffmanBitWriter) flush() {
 		n++
 	}
 	w.bits = 0
-	_, w.err = w.w.Write(w.bytes[:n])
+	w.write(w.bytes[:n])
 	w.nbytes = 0
 }
 
+func (w *huffmanBitWriter) write(b []byte) {
+	if w.err != nil {
+		return
+	}
+	_, w.err = w.writer.Write(b)
+}
+
 func (w *huffmanBitWriter) writeBits(b int32, nb uint) {
+	if w.err != nil {
+		return
+	}
 	w.bits |= uint64(b) << w.nbits
 	w.nbits += nb
 	if w.nbits >= 48 {
@@ -150,7 +164,7 @@ func (w *huffmanBitWriter) writeBits(b int32, nb uint) {
 		bytes[5] = byte(bits >> 40)
 		n += 6
 		if n >= bufferFlushSize {
-			_, w.err = w.w.Write(w.bytes[:n])
+			w.write(w.bytes[:n])
 			n = 0
 		}
 		w.nbytes = n
@@ -173,13 +187,10 @@ func (w *huffmanBitWriter) writeBytes(bytes []byte) {
 		n++
 	}
 	if n != 0 {
-		_, w.err = w.w.Write(w.bytes[:n])
-		if w.err != nil {
-			return
-		}
+		w.write(w.bytes[:n])
 	}
 	w.nbytes = 0
-	_, w.err = w.w.Write(bytes)
+	w.write(bytes)
 }
 
 // RFC 1951 3.2.7 specifies a special run-length encoding for specifying
@@ -341,7 +352,7 @@ func (w *huffmanBitWriter) writeCode(c hcode) {
 		bytes[5] = byte(bits >> 40)
 		n += 6
 		if n >= bufferFlushSize {
-			_, w.err = w.w.Write(w.bytes[:n])
+			w.write(w.bytes[:n])
 			n = 0
 		}
 		w.nbytes = n
@@ -572,6 +583,9 @@ func (w *huffmanBitWriter) indexTokens(tokens []token) (numLiterals, numOffsets
 // writeTokens writes a slice of tokens to the output.
 // codes for literal and offset encoding must be supplied.
 func (w *huffmanBitWriter) writeTokens(tokens []token, leCodes, oeCodes []hcode) {
+	if w.err != nil {
+		return
+	}
 	for _, t := range tokens {
 		if t < matchType {
 			w.writeCode(leCodes[t.literal()])
@@ -676,9 +690,9 @@ func (w *huffmanBitWriter) writeBlockHuff(eof bool, input []byte) {
 		if n < bufferFlushSize {
 			continue
 		}
-		_, w.err = w.w.Write(w.bytes[:n])
+		w.write(w.bytes[:n])
 		if w.err != nil {
-			return
+			return // Return early in the event of write failures
 		}
 		n = 0
 	}

src/hash/crc32/crc32_s390x.go

@@ -4,14 +4,9 @@
 
 package crc32
 
-import (
-	"unsafe"
-)
-
 const (
 	vxMinLen    = 64
-	vxAlignment = 16
-	vxAlignMask = vxAlignment - 1
+	vxAlignMask = 15 // align to 16 bytes
 )
 
 // hasVectorFacility reports whether the machine has the z/Architecture
@@ -49,20 +44,13 @@ func genericIEEE(crc uint32, p []byte) uint32 {
 	return update(crc, IEEETable, p)
 }
 
-// updateCastagnoli calculates the checksum of p using genericCastagnoli to
-// align the data appropriately for vectorCastagnoli. It avoids using
-// vectorCastagnoli entirely if the length of p is less than or equal to
-// vxMinLen.
+// updateCastagnoli calculates the checksum of p using
+// vectorizedCastagnoli if possible and falling back onto
+// genericCastagnoli as needed.
 func updateCastagnoli(crc uint32, p []byte) uint32 {
 	// Use vectorized function if vector facility is available and
 	// data length is above threshold.
-	if hasVX && len(p) > vxMinLen {
-		pAddr := uintptr(unsafe.Pointer(&p[0]))
-		if pAddr&vxAlignMask != 0 {
-			prealign := vxAlignment - int(pAddr&vxAlignMask)
-			crc = genericCastagnoli(crc, p[:prealign])
-			p = p[prealign:]
-		}
+	if hasVX && len(p) >= vxMinLen {
 		aligned := len(p) & ^vxAlignMask
 		crc = vectorizedCastagnoli(crc, p[:aligned])
 		p = p[aligned:]
@@ -75,19 +63,12 @@ func updateCastagnoli(crc uint32, p []byte) uint32 {
 	return genericCastagnoli(crc, p)
 }
 
-// updateIEEE calculates the checksum of p using genericIEEE to align the data
-// appropriately for vectorIEEE. It avoids using vectorIEEE entirely if the length
-// of p is less than or equal to vxMinLen.
+// updateIEEE calculates the checksum of p using vectorizedIEEE if
+// possible and falling back onto genericIEEE as needed.
 func updateIEEE(crc uint32, p []byte) uint32 {
 	// Use vectorized function if vector facility is available and
 	// data length is above threshold.
-	if hasVX && len(p) > vxMinLen {
-		pAddr := uintptr(unsafe.Pointer(&p[0]))
-		if pAddr&vxAlignMask != 0 {
-			prealign := vxAlignment - int(pAddr&vxAlignMask)
-			crc = genericIEEE(crc, p[:prealign])
-			p = p[prealign:]
-		}
+	if hasVX && len(p) >= vxMinLen {
 		aligned := len(p) & ^vxAlignMask
 		crc = vectorizedIEEE(crc, p[:aligned])
 		p = p[aligned:]

src/hash/crc32/crc32_s390x.s

@@ -128,6 +128,10 @@ TEXT vectorizedBody<>(SB),NOSPLIT,$0
 	VZERO   V0
 	VLVGF   $3, R2, V0
 
+	// Crash if the input size is less than 64-bytes.
+	CMP     R4, $64
+	BLT     crash
+
 	// Load a 64-byte data chunk and XOR with CRC
 	VLM     0(R3), V1, V4    // 64-bytes into V1..V4
 
@@ -243,3 +247,6 @@ done:
 	XOR     $0xffffffff, R2 // NOTW R2
 	MOVWZ   R2, ret + 32(FP)
 	RET
+
+crash:
+	MOVD    $0, (R0) // input size is less than 64-bytes

src/io/multi.go

@@ -18,15 +18,16 @@ func (mr *multiReader) Read(p []byte) (n int, err error) {
 			}
 		}
 		n, err = mr.readers[0].Read(p)
+		if err == EOF {
+			mr.readers = mr.readers[1:]
+		}
 		if n > 0 || err != EOF {
-			if err == EOF {
-				// Don't return EOF yet. There may be more bytes
-				// in the remaining readers.
+			if err == EOF && len(mr.readers) > 0 {
+				// Don't return EOF yet. More readers remain.
 				err = nil
 			}
 			return
 		}
-		mr.readers = mr.readers[1:]
 	}
 	return 0, EOF
 }

src/io/multi_test.go

@@ -196,3 +196,41 @@ func TestMultiReaderFlatten(t *testing.T) {
 			myDepth+2, readDepth)
 	}
 }
+
+// byteAndEOFReader is a Reader which reads one byte (the underlying
+// byte) and io.EOF at once in its Read call.
+type byteAndEOFReader byte
+
+func (b byteAndEOFReader) Read(p []byte) (n int, err error) {
+	if len(p) == 0 {
+		// Read(0 bytes) is useless. We expect no such useless
+		// calls in this test.
+		panic("unexpected call")
+	}
+	p[0] = byte(b)
+	return 1, EOF
+}
+
+// In Go 1.7, this yielded bytes forever.
+func TestMultiReaderSingleByteWithEOF(t *testing.T) {
+	got, err := ioutil.ReadAll(LimitReader(MultiReader(byteAndEOFReader('a'), byteAndEOFReader('b')), 10))
+	if err != nil {
+		t.Fatal(err)
+	}
+	const want = "ab"
+	if string(got) != want {
+		t.Errorf("got %q; want %q", got, want)
+	}
+}
+
+// Test that a reader returning (n, EOF) at the end of an MultiReader
+// chain continues to return EOF on its final read, rather than
+// yielding a (0, EOF).
+func TestMultiReaderFinalEOF(t *testing.T) {
+	r := MultiReader(bytes.NewReader(nil), byteAndEOFReader('a'))
+	buf := make([]byte, 2)
+	n, err := r.Read(buf)
+	if n != 1 || err != EOF {
+		t.Errorf("got %v, %v; want 1, EOF", n, err)
+	}
+}

src/net/dnsclient_unix.go

@@ -141,7 +141,7 @@ func (d *Dialer) dialDNS(ctx context.Context, network, server string) (dnsConn,
 }
 
 // exchange sends a query on the connection and hopes for a response.
-func exchange(ctx context.Context, server, name string, qtype uint16) (*dnsMsg, error) {
+func exchange(ctx context.Context, server, name string, qtype uint16, timeout time.Duration) (*dnsMsg, error) {
 	d := testHookDNSDialer()
 	out := dnsMsg{
 		dnsMsgHdr: dnsMsgHdr{
@@ -152,6 +152,12 @@ func exchange(ctx context.Context, server, name string, qtype uint16) (*dnsMsg,
 		},
 	}
 	for _, network := range []string{"udp", "tcp"} {
+		// TODO(mdempsky): Refactor so defers from UDP-based
+		// exchanges happen before TCP-based exchange.
+
+		ctx, cancel := context.WithDeadline(ctx, time.Now().Add(timeout))
+		defer cancel()
+
 		c, err := d.dialDNS(ctx, network, server)
 		if err != nil {
 			return nil, err
@@ -180,17 +186,10 @@ func tryOneName(ctx context.Context, cfg *dnsConfig, name string, qtype uint16)
 		return "", nil, &DNSError{Err: "no DNS servers", Name: name}
 	}
 
-	deadline := time.Now().Add(cfg.timeout)
-	if old, ok := ctx.Deadline(); !ok || deadline.Before(old) {
-		var cancel context.CancelFunc
-		ctx, cancel = context.WithDeadline(ctx, deadline)
-		defer cancel()
-	}
-
 	var lastErr error
 	for i := 0; i < cfg.attempts; i++ {
 		for _, server := range cfg.servers {
-			msg, err := exchange(ctx, server, name, qtype)
+			msg, err := exchange(ctx, server, name, qtype, cfg.timeout)
 			if err != nil {
 				lastErr = &DNSError{
 					Err:    err.Error(),
@@ -338,8 +337,9 @@ func lookup(ctx context.Context, name string, qtype uint16) (cname string, rrs [
 }
 
 // avoidDNS reports whether this is a hostname for which we should not
-// use DNS. Currently this includes only .onion and .local names,
-// per RFC 7686 and RFC 6762, respectively. See golang.org/issue/13705.
+// use DNS. Currently this includes only .onion, per RFC 7686. See
+// golang.org/issue/13705. Does not cover .local names (RFC 6762),
+// see golang.org/issue/16739.
 func avoidDNS(name string) bool {
 	if name == "" {
 		return true
@@ -347,7 +347,7 @@ func avoidDNS(name string) bool {
 	if name[len(name)-1] == '.' {
 		name = name[:len(name)-1]
 	}
-	return stringsHasSuffixFold(name, ".onion") || stringsHasSuffixFold(name, ".local")
+	return stringsHasSuffixFold(name, ".onion")
 }
 
 // nameList returns a list of names for sequential DNS queries.

src/net/dnsclient_unix_test.go

@@ -40,9 +40,9 @@ func TestDNSTransportFallback(t *testing.T) {
 	testenv.MustHaveExternalNetwork(t)
 
 	for _, tt := range dnsTransportFallbackTests {
-		ctx, cancel := context.WithTimeout(context.Background(), time.Duration(tt.timeout)*time.Second)
+		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
-		msg, err := exchange(ctx, tt.server, tt.name, tt.qtype)
+		msg, err := exchange(ctx, tt.server, tt.name, tt.qtype, time.Second)
 		if err != nil {
 			t.Error(err)
 			continue
@@ -82,9 +82,9 @@ func TestSpecialDomainName(t *testing.T) {
 
 	server := "8.8.8.8:53"
 	for _, tt := range specialDomainNameTests {
-		ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
-		msg, err := exchange(ctx, server, tt.name, tt.qtype)
+		msg, err := exchange(ctx, server, tt.name, tt.qtype, 3*time.Second)
 		if err != nil {
 			t.Error(err)
 			continue
@@ -112,10 +112,11 @@ func TestAvoidDNSName(t *testing.T) {
 		{"foo.ONION", true},
 		{"foo.ONION.", true},
 
-		{"foo.local.", true},
-		{"foo.local", true},
-		{"foo.LOCAL", true},
-		{"foo.LOCAL.", true},
+		// But do resolve *.local address; Issue 16739
+		{"foo.local.", false},
+		{"foo.local", false},
+		{"foo.LOCAL", false},
+		{"foo.LOCAL.", false},
 
 		{"", true}, // will be rejected earlier too
 
@@ -500,7 +501,7 @@ func TestErrorForOriginalNameWhenSearching(t *testing.T) {
 	d := &fakeDNSDialer{}
 	testHookDNSDialer = func() dnsDialer { return d }
 
-	d.rh = func(s string, q *dnsMsg) (*dnsMsg, error) {
+	d.rh = func(s string, q *dnsMsg, _ time.Time) (*dnsMsg, error) {
 		r := &dnsMsg{
 			dnsMsgHdr: dnsMsgHdr{
 				id: q.id,
@@ -539,14 +540,15 @@ func TestIgnoreLameReferrals(t *testing.T) {
 	}
 	defer conf.teardown()
 
-	if err := conf.writeAndUpdate([]string{"nameserver 192.0.2.1", "nameserver 192.0.2.2"}); err != nil {
+	if err := conf.writeAndUpdate([]string{"nameserver 192.0.2.1", // the one that will give a lame referral
+		"nameserver 192.0.2.2"}); err != nil {
 		t.Fatal(err)
 	}
 
 	d := &fakeDNSDialer{}
 	testHookDNSDialer = func() dnsDialer { return d }
 
-	d.rh = func(s string, q *dnsMsg) (*dnsMsg, error) {
+	d.rh = func(s string, q *dnsMsg, _ time.Time) (*dnsMsg, error) {
 		t.Log(s, q)
 		r := &dnsMsg{
 			dnsMsgHdr: dnsMsgHdr{
@@ -633,28 +635,30 @@ func BenchmarkGoLookupIPWithBrokenNameServer(b *testing.B) {
 
 type fakeDNSDialer struct {
 	// reply handler
-	rh func(s string, q *dnsMsg) (*dnsMsg, error)
+	rh func(s string, q *dnsMsg, t time.Time) (*dnsMsg, error)
 }
 
 func (f *fakeDNSDialer) dialDNS(_ context.Context, n, s string) (dnsConn, error) {
-	return &fakeDNSConn{f.rh, s}, nil
+	return &fakeDNSConn{f.rh, s, time.Time{}}, nil
 }
 
 type fakeDNSConn struct {
-	rh func(s string, q *dnsMsg) (*dnsMsg, error)
+	rh func(s string, q *dnsMsg, t time.Time) (*dnsMsg, error)
 	s  string
+	t  time.Time
 }
 
 func (f *fakeDNSConn) Close() error {
 	return nil
 }
 
-func (f *fakeDNSConn) SetDeadline(time.Time) error {
+func (f *fakeDNSConn) SetDeadline(t time.Time) error {
+	f.t = t
 	return nil
 }
 
 func (f *fakeDNSConn) dnsRoundTrip(q *dnsMsg) (*dnsMsg, error) {
-	return f.rh(f.s, q)
+	return f.rh(f.s, q, f.t)
 }
 
 // UDP round-tripper algorithm should ignore invalid DNS responses (issue 13281).
@@ -724,3 +728,72 @@ func TestIgnoreDNSForgeries(t *testing.T) {
 		t.Errorf("got address %v, want %v", got, TestAddr)
 	}
 }
+
+// Issue 16865. If a name server times out, continue to the next.
+func TestRetryTimeout(t *testing.T) {
+	origTestHookDNSDialer := testHookDNSDialer
+	defer func() { testHookDNSDialer = origTestHookDNSDialer }()
+
+	conf, err := newResolvConfTest()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer conf.teardown()
+
+	if err := conf.writeAndUpdate([]string{"nameserver 192.0.2.1", // the one that will timeout
+		"nameserver 192.0.2.2"}); err != nil {
+		t.Fatal(err)
+	}
+
+	d := &fakeDNSDialer{}
+	testHookDNSDialer = func() dnsDialer { return d }
+
+	var deadline0 time.Time
+
+	d.rh = func(s string, q *dnsMsg, deadline time.Time) (*dnsMsg, error) {
+		t.Log(s, q, deadline)
+
+		if deadline.IsZero() {
+			t.Error("zero deadline")
+		}
+
+		if s == "192.0.2.1:53" {
+			deadline0 = deadline
+			time.Sleep(10 * time.Millisecond)
+			return nil, errTimeout
+		}
+
+		if deadline == deadline0 {
+			t.Error("deadline didn't change")
+		}
+
+		r := &dnsMsg{
+			dnsMsgHdr: dnsMsgHdr{
+				id:                  q.id,
+				response:            true,
+				recursion_available: true,
+			},
+			question: q.question,
+			answer: []dnsRR{
+				&dnsRR_CNAME{
+					Hdr: dnsRR_Header{
+						Name:   q.question[0].Name,
+						Rrtype: dnsTypeCNAME,
+						Class:  dnsClassINET,
+					},
+					Cname: "golang.org",
+				},
+			},
+		}
+		return r, nil
+	}
+
+	_, err = goLookupCNAME(context.Background(), "www.golang.org")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if deadline0.IsZero() {
+		t.Error("deadline0 still zero", deadline0)
+	}
+}

src/net/http/h2_bundle.go

@@ -5460,12 +5460,15 @@ func http2bodyAndLength(req *Request) (body io.Reader, contentLen int64) {
 	// We have a body but a zero content length. Test to see if
 	// it's actually zero or just unset.
 	var buf [1]byte
-	n, rerr := io.ReadFull(body, buf[:])
+	n, rerr := body.Read(buf[:])
 	if rerr != nil && rerr != io.EOF {
 		return http2errorReader{rerr}, -1
 	}
 	if n == 1 {
 
+		if rerr == io.EOF {
+			return bytes.NewReader(buf[:]), 1
+		}
 		return io.MultiReader(bytes.NewReader(buf[:]), body), -1
 	}
 
@@ -5714,8 +5717,13 @@ func (cs *http2clientStream) writeRequestBody(body io.Reader, bodyCloser io.Clos
 		}
 	}
 
+	if sentEnd {
+
+		return nil
+	}
+
 	var trls []byte
-	if !sentEnd && hasTrailers {
+	if hasTrailers {
 		cc.mu.Lock()
 		defer cc.mu.Unlock()
 		trls = cc.encodeTrailers(req)

src/net/http/transport.go

@@ -498,8 +498,9 @@ func (t *Transport) CloseIdleConnections() {
 // CancelRequest cancels an in-flight request by closing its connection.
 // CancelRequest should only be called after RoundTrip has returned.
 //
-// Deprecated: Use Request.Cancel instead. CancelRequest cannot cancel
-// HTTP/2 requests.
+// Deprecated: Use Request.WithContext to create a request with a
+// cancelable context instead. CancelRequest cannot cancel HTTP/2
+// requests.
 func (t *Transport) CancelRequest(req *Request) {
 	t.reqMu.Lock()
 	cancel := t.reqCanceler[req]
@@ -589,6 +590,7 @@ var (
 	errReadLoopExiting    = errors.New("http: persistConn.readLoop exiting")
 	errServerClosedIdle   = errors.New("http: server closed idle connection")
 	errIdleConnTimeout    = errors.New("http: idle connection timeout")
+	errNotCachingH2Conn   = errors.New("http: not caching alternate protocol's connections")
 )
 
 // transportReadFromServerError is used by Transport.readLoop when the
@@ -632,6 +634,9 @@ func (t *Transport) tryPutIdleConn(pconn *persistConn) error {
 	if pconn.isBroken() {
 		return errConnBroken
 	}
+	if pconn.alt != nil {
+		return errNotCachingH2Conn
+	}
 	pconn.markReused()
 	key := pconn.cacheKey
 

src/net/http/transport_test.go

@@ -3511,6 +3511,61 @@ func TestTransportIdleConnTimeout(t *testing.T) {
 	}
 }
 
+// Issue 16208: Go 1.7 crashed after Transport.IdleConnTimeout if an
+// HTTP/2 connection was established but but its caller no longer
+// wanted it. (Assuming the connection cache was enabled, which it is
+// by default)
+//
+// This test reproduced the crash by setting the IdleConnTimeout low
+// (to make the test reasonable) and then making a request which is
+// canceled by the DialTLS hook, which then also waits to return the
+// real connection until after the RoundTrip saw the error.  Then we
+// know the successful tls.Dial from DialTLS will need to go into the
+// idle pool. Then we give it a of time to explode.
+func TestIdleConnH2Crash(t *testing.T) {
+	cst := newClientServerTest(t, h2Mode, HandlerFunc(func(w ResponseWriter, r *Request) {
+		// nothing
+	}))
+	defer cst.close()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	gotErr := make(chan bool, 1)
+
+	cst.tr.IdleConnTimeout = 5 * time.Millisecond
+	cst.tr.DialTLS = func(network, addr string) (net.Conn, error) {
+		cancel()
+		<-gotErr
+		c, err := tls.Dial(network, addr, &tls.Config{
+			InsecureSkipVerify: true,
+			NextProtos:         []string{"h2"},
+		})
+		if err != nil {
+			t.Error(err)
+			return nil, err
+		}
+		if cs := c.ConnectionState(); cs.NegotiatedProtocol != "h2" {
+			t.Errorf("protocol = %q; want %q", cs.NegotiatedProtocol, "h2")
+			c.Close()
+			return nil, errors.New("bogus")
+		}
+		return c, nil
+	}
+
+	req, _ := NewRequest("GET", cst.ts.URL, nil)
+	req = req.WithContext(ctx)
+	res, err := cst.c.Do(req)
+	if err == nil {
+		res.Body.Close()
+		t.Fatal("unexpected success")
+	}
+	gotErr <- true
+
+	// Wait for the explosion.
+	time.Sleep(cst.tr.IdleConnTimeout * 10)
+}
+
 type funcConn struct {
 	net.Conn
 	read  func([]byte) (int, error)

src/path/filepath/export_windows_test.go

@@ -4,4 +4,7 @@
 
 package filepath
 
-var ToNorm = toNorm
+var (
+	ToNorm   = toNorm
+	NormBase = normBase
+)

src/path/filepath/path_test.go

@@ -840,7 +840,7 @@ func TestEvalSymlinks(t *testing.T) {
 		if p, err := filepath.EvalSymlinks(path); err != nil {
 			t.Errorf("EvalSymlinks(%q) error: %v", d.path, err)
 		} else if filepath.Clean(p) != filepath.Clean(dest) {
-			t.Errorf("Clean(%q)=%q, want %q", path, p, dest)
+			t.Errorf("EvalSymlinks(%q)=%q, want %q", path, p, dest)
 		}
 
 		// test EvalSymlinks(".")
@@ -872,6 +872,34 @@ func TestEvalSymlinks(t *testing.T) {
 			t.Errorf(`EvalSymlinks(".") in %q directory returns %q, want "." or %q`, d.path, p, want)
 		}()
 
+		// test EvalSymlinks(".."+path)
+		func() {
+			defer func() {
+				err := os.Chdir(wd)
+				if err != nil {
+					t.Fatal(err)
+				}
+			}()
+
+			err := os.Chdir(simpleJoin(tmpDir, "test"))
+			if err != nil {
+				t.Error(err)
+				return
+			}
+
+			path := simpleJoin("..", d.path)
+			dest := simpleJoin("..", d.dest)
+			if filepath.IsAbs(d.dest) || os.IsPathSeparator(d.dest[0]) {
+				dest = d.dest
+			}
+
+			if p, err := filepath.EvalSymlinks(path); err != nil {
+				t.Errorf("EvalSymlinks(%q) error: %v", d.path, err)
+			} else if filepath.Clean(p) != filepath.Clean(dest) {
+				t.Errorf("EvalSymlinks(%q)=%q, want %q", path, p, dest)
+			}
+		}()
+
 		// test EvalSymlinks where parameter is relative path
 		func() {
 			defer func() {
@@ -889,7 +917,7 @@ func TestEvalSymlinks(t *testing.T) {
 			if p, err := filepath.EvalSymlinks(d.path); err != nil {
 				t.Errorf("EvalSymlinks(%q) error: %v", d.path, err)
 			} else if filepath.Clean(p) != filepath.Clean(d.dest) {
-				t.Errorf("Clean(%q)=%q, want %q", d.path, p, d.dest)
+				t.Errorf("EvalSymlinks(%q)=%q, want %q", d.path, p, d.dest)
 			}
 		}()
 	}

src/path/filepath/path_windows_test.go

@@ -329,9 +329,106 @@ func TestToNorm(t *testing.T) {
 	for _, test := range tests {
 		got, err := filepath.ToNorm(test.arg, stubBase)
 		if err != nil {
-			t.Errorf("unexpected toNorm error, arg: %s, err: %v\n", test.arg, err)
+			t.Errorf("toNorm(%s) failed: %v\n", test.arg, err)
 		} else if got != test.want {
-			t.Errorf("toNorm error, arg: %s, want: %s, got: %s\n", test.arg, test.want, got)
+			t.Errorf("toNorm(%s) returns %s, but %s expected\n", test.arg, got, test.want)
+		}
+	}
+
+	testPath := `{{tmp}}\test\foo\bar`
+
+	testsDir := []struct {
+		wd   string
+		arg  string
+		want string
+	}{
+		// test absolute paths
+		{".", `{{tmp}}\test\foo\bar`, `{{tmp}}\test\foo\bar`},
+		{".", `{{tmp}}\.\test/foo\bar`, `{{tmp}}\test\foo\bar`},
+		{".", `{{tmp}}\test\..\test\foo\bar`, `{{tmp}}\test\foo\bar`},
+		{".", `{{tmp}}\TEST\FOO\BAR`, `{{tmp}}\test\foo\bar`},
+
+		// test relative paths begin with drive letter
+		{`{{tmp}}\test`, `{{tmpvol}}.`, `{{tmpvol}}.`},
+		{`{{tmp}}\test`, `{{tmpvol}}..`, `{{tmpvol}}..`},
+		{`{{tmp}}\test`, `{{tmpvol}}foo\bar`, `{{tmpvol}}foo\bar`},
+		{`{{tmp}}\test`, `{{tmpvol}}.\foo\bar`, `{{tmpvol}}foo\bar`},
+		{`{{tmp}}\test`, `{{tmpvol}}foo\..\foo\bar`, `{{tmpvol}}foo\bar`},
+		{`{{tmp}}\test`, `{{tmpvol}}FOO\BAR`, `{{tmpvol}}foo\bar`},
+
+		// test relative paths begin with '\'
+		{".", `{{tmpnovol}}\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
+		{".", `{{tmpnovol}}\.\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
+		{".", `{{tmpnovol}}\test\..\test\foo\bar`, `{{tmpnovol}}\test\foo\bar`},
+		{".", `{{tmpnovol}}\TEST\FOO\BAR`, `{{tmpnovol}}\test\foo\bar`},
+
+		// test relative paths begin without '\'
+		{`{{tmp}}\test`, ".", `.`},
+		{`{{tmp}}\test`, "..", `..`},
+		{`{{tmp}}\test`, `foo\bar`, `foo\bar`},
+		{`{{tmp}}\test`, `.\foo\bar`, `foo\bar`},
+		{`{{tmp}}\test`, `foo\..\foo\bar`, `foo\bar`},
+		{`{{tmp}}\test`, `FOO\BAR`, `foo\bar`},
+	}
+
+	cwd, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer func() {
+		err := os.Chdir(cwd)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}()
+
+	tmp, err := ioutil.TempDir("", "testToNorm")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmp)
+
+	// ioutil.TempDir might return "non-canonical" name.
+	tmp, err = filepath.EvalSymlinks(tmp)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = os.MkdirAll(strings.Replace(testPath, "{{tmp}}", tmp, -1), 0777)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	tmpVol := filepath.VolumeName(tmp)
+	tmpNoVol := tmp[len(tmpVol):]
+
+	for _, test := range testsDir {
+		wd := strings.Replace(strings.Replace(strings.Replace(test.wd, "{{tmp}}", tmp, -1), "{{tmpvol}}", tmpVol, -1), "{{tmpnovol}}", tmpNoVol, -1)
+		arg := strings.Replace(strings.Replace(strings.Replace(test.arg, "{{tmp}}", tmp, -1), "{{tmpvol}}", tmpVol, -1), "{{tmpnovol}}", tmpNoVol, -1)
+		want := strings.Replace(strings.Replace(strings.Replace(test.want, "{{tmp}}", tmp, -1), "{{tmpvol}}", tmpVol, -1), "{{tmpnovol}}", tmpNoVol, -1)
+
+		if test.wd == "." {
+			err := os.Chdir(cwd)
+			if err != nil {
+				t.Error(err)
+
+				continue
+			}
+		} else {
+			err := os.Chdir(wd)
+			if err != nil {
+				t.Error(err)
+
+				continue
+			}
+		}
+
+		got, err := filepath.ToNorm(arg, filepath.NormBase)
+		if err != nil {
+			t.Errorf("toNorm(%s) failed: %v (wd=%s)\n", arg, err, wd)
+		} else if got != want {
+			t.Errorf("toNorm(%s) returns %s, but %s expected (wd=%s)\n", arg, got, want, wd)
 		}
 	}
 }

src/path/filepath/symlink_windows.go

@@ -22,7 +22,7 @@ func normVolumeName(path string) string {
 	return strings.ToUpper(volume)
 }
 
-// normBase retruns the last element of path.
+// normBase returns the last element of path with correct case.
 func normBase(path string) (string, error) {
 	p, err := syscall.UTF16PtrFromString(path)
 	if err != nil {
@@ -40,7 +40,24 @@ func normBase(path string) (string, error) {
 	return syscall.UTF16ToString(data.FileName[:]), nil
 }
 
-func toNorm(path string, base func(string) (string, error)) (string, error) {
+// baseIsDotDot returns whether the last element of path is "..".
+// The given path should be 'Clean'-ed in advance.
+func baseIsDotDot(path string) bool {
+	i := strings.LastIndexByte(path, Separator)
+	return path[i+1:] == ".."
+}
+
+// toNorm returns the normalized path that is guranteed to be unique.
+// It should accept the following formats:
+//   * UNC paths                              (e.g \\server\share\foo\bar)
+//   * absolute paths                         (e.g C:\foo\bar)
+//   * relative paths begin with drive letter (e.g C:foo\bar, C:..\foo\bar, C:.., C:.)
+//   * relative paths begin with '\'          (e.g \foo\bar)
+//   * relative paths begin without '\'       (e.g foo\bar, ..\foo\bar, .., .)
+// The returned normalized path will be in the same form (of 5 listed above) as the input path.
+// If two paths A and B are indicating the same file with the same format, toNorm(A) should be equal to toNorm(B).
+// The normBase parameter should be equal to the normBase func, except for in tests.  See docs on the normBase func.
+func toNorm(path string, normBase func(string) (string, error)) (string, error) {
 	if path == "" {
 		return path, nil
 	}
@@ -58,7 +75,13 @@ func toNorm(path string, base func(string) (string, error)) (string, error) {
 	var normPath string
 
 	for {
-		name, err := base(volume + path)
+		if baseIsDotDot(path) {
+			normPath = path + `\` + normPath
+
+			break
+		}
+
+		name, err := normBase(volume + path)
 		if err != nil {
 			return "", err
 		}

src/reflect/all_test.go

@@ -5720,6 +5720,8 @@ func TestTypeStrings(t *testing.T) {
 		{TypeOf(new(XM)), "*reflect_test.XM"},
 		{TypeOf(new(XM).String), "func() string"},
 		{TypeOf(new(XM)).Method(0).Type, "func(*reflect_test.XM) string"},
+		{ChanOf(3, TypeOf(XM{})), "chan reflect_test.XM"},
+		{MapOf(TypeOf(int(0)), TypeOf(XM{})), "map[int]reflect_test.XM"},
 	}
 
 	for i, test := range stringTests {

src/reflect/type.go

@@ -1848,6 +1848,7 @@ func ChanOf(dir ChanDir, t Type) Type {
 	prototype := *(**chanType)(unsafe.Pointer(&ichan))
 	ch := new(chanType)
 	*ch = *prototype
+	ch.tflag = 0
 	ch.dir = uintptr(dir)
 	ch.str = resolveReflectName(newName(s, "", "", false))
 	ch.hash = fnv1(typ.hash, 'c', byte(dir))
@@ -1892,6 +1893,7 @@ func MapOf(key, elem Type) Type {
 	mt := new(mapType)
 	*mt = **(**mapType)(unsafe.Pointer(&imap))
 	mt.str = resolveReflectName(newName(s, "", "", false))
+	mt.tflag = 0
 	mt.hash = fnv1(etyp.hash, 'm', byte(ktyp.hash>>24), byte(ktyp.hash>>16), byte(ktyp.hash>>8), byte(ktyp.hash))
 	mt.key = ktyp
 	mt.elem = etyp

src/runtime/mheap.go

@@ -917,7 +917,9 @@ func scavengelist(list *mSpanList, now, limit uint64) uintptr {
 				// more memory than we want.)
 				start = (start + sys.PhysPageSize - 1) &^ (sys.PhysPageSize - 1)
 				end &^= sys.PhysPageSize - 1
-				if start == end {
+				if end <= start {
+					// start and end don't span a
+					// whole physical page.
 					continue
 				}
 			}

src/syscall/syscall_bsd_test.go

@@ -7,28 +7,45 @@
 package syscall_test
 
 import (
+	"os/exec"
 	"syscall"
 	"testing"
 )
 
 const MNT_WAIT = 1
+const MNT_NOWAIT = 2
 
 func TestGetfsstat(t *testing.T) {
-	n, err := syscall.Getfsstat(nil, MNT_WAIT)
+	const flags = MNT_NOWAIT // see Issue 16937
+	n, err := syscall.Getfsstat(nil, flags)
+	t.Logf("Getfsstat(nil, %d) = (%v, %v)", flags, n, err)
 	if err != nil {
 		t.Fatal(err)
 	}
 
 	data := make([]syscall.Statfs_t, n)
-	n, err = syscall.Getfsstat(data, MNT_WAIT)
+	n2, err := syscall.Getfsstat(data, flags)
+	t.Logf("Getfsstat([]syscall.Statfs_t, %d) = (%v, %v)", flags, n2, err)
 	if err != nil {
 		t.Fatal(err)
 	}
-
-	empty := syscall.Statfs_t{}
-	for _, stat := range data {
-		if stat == empty {
-			t.Fatal("an empty Statfs_t struct was returned")
+	if n != n2 {
+		t.Errorf("Getfsstat(nil) = %d, but subsequent Getfsstat(slice) = %d", n, n2)
+	}
+	for i, stat := range data {
+		if stat == (syscall.Statfs_t{}) {
+			t.Errorf("index %v is an empty Statfs_t struct", i)
+		}
+	}
+	if t.Failed() {
+		for i, stat := range data[:n2] {
+			t.Logf("data[%v] = %+v", i, stat)
+		}
+		mount, err := exec.Command("mount").CombinedOutput()
+		if err != nil {
+			t.Logf("mount: %v\n%s", err, mount)
+		} else {
+			t.Logf("mount: %s", mount)
 		}
 	}
 }