Merge release-20200810.0-39-g3bd066d50 (automated)

11 files changed, 277 insertions, 59 deletions

diff --git a/pkg/abi/linux/linux_abi_autogen_unsafe.go b/pkg/abi/linux/linux_abi_autogen_unsafe.go
index 92451b60e..63380dbb4 100644
--- a/pkg/abi/linux/linux_abi_autogen_unsafe.go
+++ b/pkg/abi/linux/linux_abi_autogen_unsafe.go
@@ -167,7 +167,7 @@ func (s *Statx) MarshalUnsafe(dst []byte) {
 
 // UnmarshalUnsafe implements marshal.Marshallable.UnmarshalUnsafe.
 func (s *Statx) UnmarshalUnsafe(src []byte) {
-    if s.Mtime.Packed() && s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() {
+    if s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() {
         safecopy.CopyOut(unsafe.Pointer(s), src)
     } else {
         // Type Statx doesn't have a packed layout in memory, fallback to UnmarshalBytes.
@@ -178,7 +178,7 @@ func (s *Statx) UnmarshalUnsafe(src []byte) {
 // CopyOutN implements marshal.Marshallable.CopyOutN.
 //go:nosplit
 func (s *Statx) CopyOutN(task marshal.Task, addr usermem.Addr, limit int) (int, error) {
-    if !s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() {
+    if !s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() && s.Atime.Packed() {
         // Type Statx doesn't have a packed layout in memory, fall back to MarshalBytes.
         buf := task.CopyScratchBuffer(s.SizeBytes()) // escapes: okay.
         s.MarshalBytes(buf) // escapes: fallback.
@@ -208,7 +208,7 @@ func (s *Statx) CopyOut(task marshal.Task, addr usermem.Addr) (int, error) {
 // CopyIn implements marshal.Marshallable.CopyIn.
 //go:nosplit
 func (s *Statx) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
-    if !s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() && s.Atime.Packed() {
+    if !s.Atime.Packed() && s.Btime.Packed() && s.Ctime.Packed() && s.Mtime.Packed() {
         // Type Statx doesn't have a packed layout in memory, fall back to UnmarshalBytes.
         buf := task.CopyScratchBuffer(s.SizeBytes()) // escapes: okay.
         length, err := task.CopyInBytes(addr, buf) // escapes: okay.
@@ -627,12 +627,12 @@ func (f *FUSEHeaderIn) UnmarshalBytes(src []byte) {
 // Packed implements marshal.Marshallable.Packed.
 //go:nosplit
 func (f *FUSEHeaderIn) Packed() bool {
-    return f.Opcode.Packed() && f.Unique.Packed()
+    return f.Unique.Packed() && f.Opcode.Packed()
 }
 
 // MarshalUnsafe implements marshal.Marshallable.MarshalUnsafe.
 func (f *FUSEHeaderIn) MarshalUnsafe(dst []byte) {
-    if f.Opcode.Packed() && f.Unique.Packed() {
+    if f.Unique.Packed() && f.Opcode.Packed() {
         safecopy.CopyIn(dst, unsafe.Pointer(f))
     } else {
         // Type FUSEHeaderIn doesn't have a packed layout in memory, fallback to MarshalBytes.
@@ -2213,7 +2213,7 @@ func (i *IPTIP) Packed() bool {
 
 // MarshalUnsafe implements marshal.Marshallable.MarshalUnsafe.
 func (i *IPTIP) MarshalUnsafe(dst []byte) {
-    if i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() && i.Dst.Packed() {
+    if i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
         safecopy.CopyIn(dst, unsafe.Pointer(i))
     } else {
         // Type IPTIP doesn't have a packed layout in memory, fallback to MarshalBytes.
@@ -2223,7 +2223,7 @@ func (i *IPTIP) MarshalUnsafe(dst []byte) {
 
 // UnmarshalUnsafe implements marshal.Marshallable.UnmarshalUnsafe.
 func (i *IPTIP) UnmarshalUnsafe(src []byte) {
-    if i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
+    if i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() && i.Dst.Packed() {
         safecopy.CopyOut(unsafe.Pointer(i), src)
     } else {
         // Type IPTIP doesn't have a packed layout in memory, fallback to UnmarshalBytes.
@@ -2264,7 +2264,7 @@ func (i *IPTIP) CopyOut(task marshal.Task, addr usermem.Addr) (int, error) {
 // CopyIn implements marshal.Marshallable.CopyIn.
 //go:nosplit
 func (i *IPTIP) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
-    if !i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
+    if !i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() && i.Dst.Packed() {
         // Type IPTIP doesn't have a packed layout in memory, fall back to UnmarshalBytes.
         buf := task.CopyScratchBuffer(i.SizeBytes()) // escapes: okay.
         length, err := task.CopyInBytes(addr, buf) // escapes: okay.
@@ -3014,7 +3014,7 @@ func (i *IP6TEntry) MarshalUnsafe(dst []byte) {
 
 // UnmarshalUnsafe implements marshal.Marshallable.UnmarshalUnsafe.
 func (i *IP6TEntry) UnmarshalUnsafe(src []byte) {
-    if i.IPv6.Packed() && i.Counters.Packed() {
+    if i.Counters.Packed() && i.IPv6.Packed() {
         safecopy.CopyOut(unsafe.Pointer(i), src)
     } else {
         // Type IP6TEntry doesn't have a packed layout in memory, fallback to UnmarshalBytes.
@@ -3055,7 +3055,7 @@ func (i *IP6TEntry) CopyOut(task marshal.Task, addr usermem.Addr) (int, error) {
 // CopyIn implements marshal.Marshallable.CopyIn.
 //go:nosplit
 func (i *IP6TEntry) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
-    if !i.IPv6.Packed() && i.Counters.Packed() {
+    if !i.Counters.Packed() && i.IPv6.Packed() {
         // Type IP6TEntry doesn't have a packed layout in memory, fall back to UnmarshalBytes.
         buf := task.CopyScratchBuffer(i.SizeBytes()) // escapes: okay.
         length, err := task.CopyInBytes(addr, buf) // escapes: okay.
@@ -3081,7 +3081,7 @@ func (i *IP6TEntry) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
 
 // WriteTo implements io.WriterTo.WriteTo.
 func (i *IP6TEntry) WriteTo(w io.Writer) (int64, error) {
-    if !i.Counters.Packed() && i.IPv6.Packed() {
+    if !i.IPv6.Packed() && i.Counters.Packed() {
         // Type IP6TEntry doesn't have a packed layout in memory, fall back to MarshalBytes.
         buf := make([]byte, i.SizeBytes())
         i.MarshalBytes(buf)
@@ -3196,12 +3196,12 @@ func (i *IP6TIP) UnmarshalBytes(src []byte) {
 // Packed implements marshal.Marshallable.Packed.
 //go:nosplit
 func (i *IP6TIP) Packed() bool {
-    return i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed()
+    return i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() && i.Dst.Packed()
 }
 
 // MarshalUnsafe implements marshal.Marshallable.MarshalUnsafe.
 func (i *IP6TIP) MarshalUnsafe(dst []byte) {
-    if i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
+    if i.DstMask.Packed() && i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() {
         safecopy.CopyIn(dst, unsafe.Pointer(i))
     } else {
         // Type IP6TIP doesn't have a packed layout in memory, fallback to MarshalBytes.
@@ -3211,7 +3211,7 @@ func (i *IP6TIP) MarshalUnsafe(dst []byte) {
 
 // UnmarshalUnsafe implements marshal.Marshallable.UnmarshalUnsafe.
 func (i *IP6TIP) UnmarshalUnsafe(src []byte) {
-    if i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() {
+    if i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
         safecopy.CopyOut(unsafe.Pointer(i), src)
     } else {
         // Type IP6TIP doesn't have a packed layout in memory, fallback to UnmarshalBytes.
@@ -3252,7 +3252,7 @@ func (i *IP6TIP) CopyOut(task marshal.Task, addr usermem.Addr) (int, error) {
 // CopyIn implements marshal.Marshallable.CopyIn.
 //go:nosplit
 func (i *IP6TIP) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
-    if !i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() && i.Dst.Packed() {
+    if !i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
         // Type IP6TIP doesn't have a packed layout in memory, fall back to UnmarshalBytes.
         buf := task.CopyScratchBuffer(i.SizeBytes()) // escapes: okay.
         length, err := task.CopyInBytes(addr, buf) // escapes: okay.
@@ -3278,7 +3278,7 @@ func (i *IP6TIP) CopyIn(task marshal.Task, addr usermem.Addr) (int, error) {
 
 // WriteTo implements io.WriterTo.WriteTo.
 func (i *IP6TIP) WriteTo(w io.Writer) (int64, error) {
-    if !i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() && i.Src.Packed() {
+    if !i.Src.Packed() && i.Dst.Packed() && i.SrcMask.Packed() && i.DstMask.Packed() {
         // Type IP6TIP doesn't have a packed layout in memory, fall back to MarshalBytes.
         buf := make([]byte, i.SizeBytes())
         i.MarshalBytes(buf)
diff --git a/pkg/refs_vfs2/refs.go b/pkg/refs_vfs2/refs.go
new file mode 100644
index 000000000..99a074e96
--- /dev/null
+++ b/pkg/refs_vfs2/refs.go
@@ -0,0 +1,36 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package refs_vfs2 defines an interface for a reference-counted object.
+package refs_vfs2
+
+import (
+	"gvisor.dev/gvisor/pkg/context"
+)
+
+// RefCounter is the interface to be implemented by objects that are reference
+// counted.
+type RefCounter interface {
+	// IncRef increments the reference counter on the object.
+	IncRef()
+
+	// DecRef decrements the object's reference count. Users of refs_template.Refs
+	// may specify a destructor to be called once the reference count reaches zero.
+	DecRef(ctx context.Context)
+
+	// TryIncRef attempts to increment the reference count, but may fail if all
+	// references have already been dropped, in which case it returns false. If
+	// true is returned, then a valid reference is now held on the object.
+	TryIncRef() bool
+}
diff --git a/pkg/refs_vfs2/refs_vfs2_state_autogen.go b/pkg/refs_vfs2/refs_vfs2_state_autogen.go
new file mode 100644
index 000000000..46925b4a4
--- /dev/null
+++ b/pkg/refs_vfs2/refs_vfs2_state_autogen.go
@@ -0,0 +1,3 @@
+// automatically generated by stateify.
+
+package refs_vfs2
diff --git a/pkg/sentry/fsimpl/tmpfs/inode_refs.go b/pkg/sentry/fsimpl/tmpfs/inode_refs.go
index 8b7ff185f..38eddde7e 100644
--- a/pkg/sentry/fsimpl/tmpfs/inode_refs.go
+++ b/pkg/sentry/fsimpl/tmpfs/inode_refs.go
@@ -1,11 +1,10 @@
 package tmpfs
 
 import (
-	"runtime"
-	"sync/atomic"
-
 	"gvisor.dev/gvisor/pkg/log"
 	refs_vfs1 "gvisor.dev/gvisor/pkg/refs"
+	"runtime"
+	"sync/atomic"
 )
 
 // ownerType is used to customize logging. Note that we use a pointer to T so
diff --git a/pkg/sentry/kernel/abstract_socket_namespace.go b/pkg/sentry/kernel/abstract_socket_namespace.go
index 52ed5cea2..1b9721534 100644
--- a/pkg/sentry/kernel/abstract_socket_namespace.go
+++ b/pkg/sentry/kernel/abstract_socket_namespace.go
@@ -15,29 +15,21 @@
 package kernel
 
 import (
+	"fmt"
 	"syscall"
 
 	"gvisor.dev/gvisor/pkg/context"
-	"gvisor.dev/gvisor/pkg/refs"
+	"gvisor.dev/gvisor/pkg/refs_vfs2"
 	"gvisor.dev/gvisor/pkg/sentry/socket/unix/transport"
 	"gvisor.dev/gvisor/pkg/sync"
 )
 
 // +stateify savable
 type abstractEndpoint struct {
-	ep   transport.BoundEndpoint
-	wr   *refs.WeakRef
-	name string
-	ns   *AbstractSocketNamespace
-}
-
-// WeakRefGone implements refs.WeakRefUser.WeakRefGone.
-func (e *abstractEndpoint) WeakRefGone(context.Context) {
-	e.ns.mu.Lock()
-	if e.ns.endpoints[e.name].ep == e.ep {
-		delete(e.ns.endpoints, e.name)
-	}
-	e.ns.mu.Unlock()
+	ep     transport.BoundEndpoint
+	socket refs_vfs2.RefCounter
+	name   string
+	ns     *AbstractSocketNamespace
 }
 
 // AbstractSocketNamespace is used to implement the Linux abstract socket functionality.
@@ -46,7 +38,11 @@ func (e *abstractEndpoint) WeakRefGone(context.Context) {
 type AbstractSocketNamespace struct {
 	mu sync.Mutex `state:"nosave"`
 
-	// Keeps mapping from name to endpoint.
+	// Keeps a mapping from name to endpoint. AbstractSocketNamespace does not hold
+	// any references on any sockets that it contains; when retrieving a socket,
+	// TryIncRef() must be called in case the socket is concurrently being
+	// destroyed. It is the responsibility of the socket to remove itself from the
+	// abstract socket namespace when it is destroyed.
 	endpoints map[string]abstractEndpoint
 }
 
@@ -58,15 +54,15 @@ func NewAbstractSocketNamespace() *AbstractSocketNamespace {
 }
 
 // A boundEndpoint wraps a transport.BoundEndpoint to maintain a reference on
-// its backing object.
+// its backing socket.
 type boundEndpoint struct {
 	transport.BoundEndpoint
-	rc refs.RefCounter
+	socket refs_vfs2.RefCounter
 }
 
 // Release implements transport.BoundEndpoint.Release.
 func (e *boundEndpoint) Release(ctx context.Context) {
-	e.rc.DecRef(ctx)
+	e.socket.DecRef(ctx)
 	e.BoundEndpoint.Release(ctx)
 }
 
@@ -81,32 +77,59 @@ func (a *AbstractSocketNamespace) BoundEndpoint(name string) transport.BoundEndp
 		return nil
 	}
 
-	rc := ep.wr.Get()
-	if rc == nil {
-		delete(a.endpoints, name)
+	if !ep.socket.TryIncRef() {
+		// The socket has reached zero references and is being destroyed.
 		return nil
 	}
 
-	return &boundEndpoint{ep.ep, rc}
+	return &boundEndpoint{ep.ep, ep.socket}
 }
 
 // Bind binds the given socket.
 //
-// When the last reference managed by rc is dropped, ep may be removed from the
+// When the last reference managed by socket is dropped, ep may be removed from the
 // namespace.
-func (a *AbstractSocketNamespace) Bind(ctx context.Context, name string, ep transport.BoundEndpoint, rc refs.RefCounter) error {
+func (a *AbstractSocketNamespace) Bind(ctx context.Context, name string, ep transport.BoundEndpoint, socket refs_vfs2.RefCounter) error {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 
+	// Check if there is already a socket (which has not yet been destroyed) bound at name.
 	if ep, ok := a.endpoints[name]; ok {
-		if rc := ep.wr.Get(); rc != nil {
-			rc.DecRef(ctx)
+		if ep.socket.TryIncRef() {
+			ep.socket.DecRef(ctx)
 			return syscall.EADDRINUSE
 		}
 	}
 
 	ae := abstractEndpoint{ep: ep, name: name, ns: a}
-	ae.wr = refs.NewWeakRef(rc, &ae)
+	ae.socket = socket
 	a.endpoints[name] = ae
 	return nil
 }
+
+// Remove removes the specified socket at name from the abstract socket
+// namespace, if it has not yet been replaced.
+func (a *AbstractSocketNamespace) Remove(name string, socket refs_vfs2.RefCounter) {
+	a.mu.Lock()
+	defer a.mu.Unlock()
+
+	ep, ok := a.endpoints[name]
+	if !ok {
+		// We never delete a map entry apart from a socket's destructor (although the
+		// map entry may be overwritten). Therefore, a socket should exist, even if it
+		// may not be the one we expect.
+		panic(fmt.Sprintf("expected socket to exist at '%s' in abstract socket namespace", name))
+	}
+
+	// A Bind() operation may race with callers of Remove(), e.g. in the
+	// following case:
+	//   socket1 reaches zero references and begins destruction
+	//   a.Bind("foo", ep, socket2) replaces socket1 with socket2
+	//   socket1's destructor calls a.Remove("foo", socket1)
+	//
+	// Therefore, we need to check that the socket at name is what we expect
+	// before modifying the map.
+	if ep.socket == socket {
+		delete(a.endpoints, name)
+	}
+}
diff --git a/pkg/sentry/kernel/kernel_state_autogen.go b/pkg/sentry/kernel/kernel_state_autogen.go
index 8ab5e6f8e..106e237ec 100644
--- a/pkg/sentry/kernel/kernel_state_autogen.go
+++ b/pkg/sentry/kernel/kernel_state_autogen.go
@@ -16,7 +16,7 @@ func (x *abstractEndpoint) StateTypeName() string {
 func (x *abstractEndpoint) StateFields() []string {
 	return []string{
 		"ep",
-		"wr",
+		"socket",
 		"name",
 		"ns",
 	}
@@ -27,7 +27,7 @@ func (x *abstractEndpoint) beforeSave() {}
 func (x *abstractEndpoint) StateSave(m state.Sink) {
 	x.beforeSave()
 	m.Save(0, &x.ep)
-	m.Save(1, &x.wr)
+	m.Save(1, &x.socket)
 	m.Save(2, &x.name)
 	m.Save(3, &x.ns)
 }
@@ -36,7 +36,7 @@ func (x *abstractEndpoint) afterLoad() {}
 
 func (x *abstractEndpoint) StateLoad(m state.Source) {
 	m.Load(0, &x.ep)
-	m.Load(1, &x.wr)
+	m.Load(1, &x.socket)
 	m.Load(2, &x.name)
 	m.Load(3, &x.ns)
 }
diff --git a/pkg/sentry/platform/ring0/defs_impl_arm64.go b/pkg/sentry/platform/ring0/defs_impl_arm64.go
index 424b66f76..2dac9ad14 100644
--- a/pkg/sentry/platform/ring0/defs_impl_arm64.go
+++ b/pkg/sentry/platform/ring0/defs_impl_arm64.go
@@ -3,11 +3,11 @@ package ring0
 import (
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/platform/ring0/pagetables"
+	"reflect"
 
 	"fmt"
 	"gvisor.dev/gvisor/pkg/usermem"
 	"io"
-	"reflect"
 )
 
 // Useful bits.
diff --git a/pkg/sentry/socket/unix/socket_refs.go b/pkg/sentry/socket/unix/socket_refs.go
new file mode 100644
index 000000000..8eb0c9327
--- /dev/null
+++ b/pkg/sentry/socket/unix/socket_refs.go
@@ -0,0 +1,111 @@
+package unix
+
+import (
+	"gvisor.dev/gvisor/pkg/log"
+	refs_vfs1 "gvisor.dev/gvisor/pkg/refs"
+	"runtime"
+	"sync/atomic"
+)
+
+// ownerType is used to customize logging. Note that we use a pointer to T so
+// that we do not copy the entire object when passed as a format parameter.
+var socketOpsCommonownerType *socketOpsCommon
+
+// Refs implements refs.RefCounter. It keeps a reference count using atomic
+// operations and calls the destructor when the count reaches zero.
+//
+// Note that the number of references is actually refCount + 1 so that a default
+// zero-value Refs object contains one reference.
+//
+// +stateify savable
+type socketOpsCommonRefs struct {
+	// refCount is composed of two fields:
+	//
+	//	[32-bit speculative references]:[32-bit real references]
+	//
+	// Speculative references are used for TryIncRef, to avoid a CompareAndSwap
+	// loop. See IncRef, DecRef and TryIncRef for details of how these fields are
+	// used.
+	refCount int64
+}
+
+func (r *socketOpsCommonRefs) finalize() {
+	var note string
+	switch refs_vfs1.GetLeakMode() {
+	case refs_vfs1.NoLeakChecking:
+		return
+	case refs_vfs1.UninitializedLeakChecking:
+		note = "(Leak checker uninitialized): "
+	}
+	if n := r.ReadRefs(); n != 0 {
+		log.Warningf("%sRefs %p owned by %T garbage collected with ref count of %d (want 0)", note, r, socketOpsCommonownerType, n)
+	}
+}
+
+// EnableLeakCheck checks for reference leaks when Refs gets garbage collected.
+func (r *socketOpsCommonRefs) EnableLeakCheck() {
+	if refs_vfs1.GetLeakMode() != refs_vfs1.NoLeakChecking {
+		runtime.SetFinalizer(r, (*socketOpsCommonRefs).finalize)
+	}
+}
+
+// ReadRefs returns the current number of references. The returned count is
+// inherently racy and is unsafe to use without external synchronization.
+func (r *socketOpsCommonRefs) ReadRefs() int64 {
+
+	return atomic.LoadInt64(&r.refCount) + 1
+}
+
+// IncRef implements refs.RefCounter.IncRef.
+//
+//go:nosplit
+func (r *socketOpsCommonRefs) IncRef() {
+	if v := atomic.AddInt64(&r.refCount, 1); v <= 0 {
+		panic("Incrementing non-positive ref count")
+	}
+}
+
+// TryIncRef implements refs.RefCounter.TryIncRef.
+//
+// To do this safely without a loop, a speculative reference is first acquired
+// on the object. This allows multiple concurrent TryIncRef calls to distinguish
+// other TryIncRef calls from genuine references held.
+//
+//go:nosplit
+func (r *socketOpsCommonRefs) TryIncRef() bool {
+	const speculativeRef = 1 << 32
+	v := atomic.AddInt64(&r.refCount, speculativeRef)
+	if int32(v) < 0 {
+
+		atomic.AddInt64(&r.refCount, -speculativeRef)
+		return false
+	}
+
+	atomic.AddInt64(&r.refCount, -speculativeRef+1)
+	return true
+}
+
+// DecRef implements refs.RefCounter.DecRef.
+//
+// Note that speculative references are counted here. Since they were added
+// prior to real references reaching zero, they will successfully convert to
+// real references. In other words, we see speculative references only in the
+// following case:
+//
+//	A: TryIncRef [speculative increase => sees non-negative references]
+//	B: DecRef [real decrease]
+//	A: TryIncRef [transform speculative to real]
+//
+//go:nosplit
+func (r *socketOpsCommonRefs) DecRef(destroy func()) {
+	switch v := atomic.AddInt64(&r.refCount, -1); {
+	case v < -1:
+		panic("Decrementing non-positive ref count")
+
+	case v == -1:
+
+		if destroy != nil {
+			destroy()
+		}
+	}
+}
diff --git a/pkg/sentry/socket/unix/unix.go b/pkg/sentry/socket/unix/unix.go
index 2b8454edb..b7e8e4325 100644
--- a/pkg/sentry/socket/unix/unix.go
+++ b/pkg/sentry/socket/unix/unix.go
@@ -24,7 +24,6 @@ import (
 	"gvisor.dev/gvisor/pkg/abi/linux"
 	"gvisor.dev/gvisor/pkg/context"
 	"gvisor.dev/gvisor/pkg/fspath"
-	"gvisor.dev/gvisor/pkg/refs"
 	"gvisor.dev/gvisor/pkg/sentry/arch"
 	"gvisor.dev/gvisor/pkg/sentry/fs"
 	"gvisor.dev/gvisor/pkg/sentry/fs/fsutil"
@@ -80,7 +79,7 @@ func NewWithDirent(ctx context.Context, d *fs.Dirent, ep transport.Endpoint, sty
 			stype: stype,
 		},
 	}
-	s.EnableLeakCheck("unix.SocketOperations")
+	s.EnableLeakCheck()
 
 	return fs.NewFile(ctx, d, flags, &s)
 }
@@ -89,17 +88,26 @@ func NewWithDirent(ctx context.Context, d *fs.Dirent, ep transport.Endpoint, sty
 //
 // +stateify savable
 type socketOpsCommon struct {
-	refs.AtomicRefCount
+	socketOpsCommonRefs
 	socket.SendReceiveTimeout
 
 	ep    transport.Endpoint
 	stype linux.SockType
+
+	// abstractName and abstractNamespace indicate the name and namespace of the
+	// socket if it is bound to an abstract socket namespace. Once the socket is
+	// bound, they cannot be modified.
+	abstractName      string
+	abstractNamespace *kernel.AbstractSocketNamespace
 }
 
 // DecRef implements RefCounter.DecRef.
 func (s *socketOpsCommon) DecRef(ctx context.Context) {
-	s.DecRefWithDestructor(ctx, func(context.Context) {
+	s.socketOpsCommonRefs.DecRef(func() {
 		s.ep.Close(ctx)
+		if s.abstractNamespace != nil {
+			s.abstractNamespace.Remove(s.abstractName, s)
+		}
 	})
 }
 
@@ -284,10 +292,14 @@ func (s *SocketOperations) Bind(t *kernel.Task, sockaddr []byte) *syserr.Error {
 			if t.IsNetworkNamespaced() {
 				return syserr.ErrInvalidEndpointState
 			}
-			if err := t.AbstractSockets().Bind(t, p[1:], bep, s); err != nil {
+			asn := t.AbstractSockets()
+			name := p[1:]
+			if err := asn.Bind(t, name, bep, s); err != nil {
 				// syserr.ErrPortInUse corresponds to EADDRINUSE.
 				return syserr.ErrPortInUse
 			}
+			s.abstractName = name
+			s.abstractNamespace = asn
 		} else {
 			// The parent and name.
 			var d *fs.Dirent
diff --git a/pkg/sentry/socket/unix/unix_state_autogen.go b/pkg/sentry/socket/unix/unix_state_autogen.go
index 4a3bbc11b..6966529c6 100644
--- a/pkg/sentry/socket/unix/unix_state_autogen.go
+++ b/pkg/sentry/socket/unix/unix_state_autogen.go
@@ -6,6 +6,29 @@ import (
 	"gvisor.dev/gvisor/pkg/state"
 )
 
+func (x *socketOpsCommonRefs) StateTypeName() string {
+	return "pkg/sentry/socket/unix.socketOpsCommonRefs"
+}
+
+func (x *socketOpsCommonRefs) StateFields() []string {
+	return []string{
+		"refCount",
+	}
+}
+
+func (x *socketOpsCommonRefs) beforeSave() {}
+
+func (x *socketOpsCommonRefs) StateSave(m state.Sink) {
+	x.beforeSave()
+	m.Save(0, &x.refCount)
+}
+
+func (x *socketOpsCommonRefs) afterLoad() {}
+
+func (x *socketOpsCommonRefs) StateLoad(m state.Source) {
+	m.Load(0, &x.refCount)
+}
+
 func (x *SocketOperations) StateTypeName() string {
 	return "pkg/sentry/socket/unix.SocketOperations"
 }
@@ -35,10 +58,12 @@ func (x *socketOpsCommon) StateTypeName() string {
 
 func (x *socketOpsCommon) StateFields() []string {
 	return []string{
-		"AtomicRefCount",
+		"socketOpsCommonRefs",
 		"SendReceiveTimeout",
 		"ep",
 		"stype",
+		"abstractName",
+		"abstractNamespace",
 	}
 }
 
@@ -46,22 +71,27 @@ func (x *socketOpsCommon) beforeSave() {}
 
 func (x *socketOpsCommon) StateSave(m state.Sink) {
 	x.beforeSave()
-	m.Save(0, &x.AtomicRefCount)
+	m.Save(0, &x.socketOpsCommonRefs)
 	m.Save(1, &x.SendReceiveTimeout)
 	m.Save(2, &x.ep)
 	m.Save(3, &x.stype)
+	m.Save(4, &x.abstractName)
+	m.Save(5, &x.abstractNamespace)
 }
 
 func (x *socketOpsCommon) afterLoad() {}
 
 func (x *socketOpsCommon) StateLoad(m state.Source) {
-	m.Load(0, &x.AtomicRefCount)
+	m.Load(0, &x.socketOpsCommonRefs)
 	m.Load(1, &x.SendReceiveTimeout)
 	m.Load(2, &x.ep)
 	m.Load(3, &x.stype)
+	m.Load(4, &x.abstractName)
+	m.Load(5, &x.abstractNamespace)
 }
 
 func init() {
+	state.Register((*socketOpsCommonRefs)(nil))
 	state.Register((*SocketOperations)(nil))
 	state.Register((*socketOpsCommon)(nil))
 }
diff --git a/pkg/sentry/socket/unix/unix_vfs2.go b/pkg/sentry/socket/unix/unix_vfs2.go
index dfa25241a..d066ef8ab 100644
--- a/pkg/sentry/socket/unix/unix_vfs2.go
+++ b/pkg/sentry/socket/unix/unix_vfs2.go
@@ -183,10 +183,14 @@ func (s *SocketVFS2) Bind(t *kernel.Task, sockaddr []byte) *syserr.Error {
 			if t.IsNetworkNamespaced() {
 				return syserr.ErrInvalidEndpointState
 			}
-			if err := t.AbstractSockets().Bind(t, p[1:], bep, s); err != nil {
+			asn := t.AbstractSockets()
+			name := p[1:]
+			if err := asn.Bind(t, name, bep, s); err != nil {
 				// syserr.ErrPortInUse corresponds to EADDRINUSE.
 				return syserr.ErrPortInUse
 			}
+			s.abstractName = name
+			s.abstractNamespace = asn
 		} else {
 			path := fspath.Parse(p)
 			root := t.FSContext().RootDirectoryVFS2()