diff -aruN docker-1.7.1/daemon/graphdriver/devmapper/deviceset.go docker-1.7.1-go-1.5/daemon/graphdriver/devmapper/deviceset.go
--- docker-1.7.1/daemon/graphdriver/devmapper/deviceset.go	2015-07-14 20:41:25.000000000 +0200
+++ docker-1.7.1-go-1.5/daemon/graphdriver/devmapper/deviceset.go	2016-02-22 13:46:24.352870744 +0100
@@ -1272,14 +1272,15 @@
 	if err != nil {
 		return err
 	}
-	if d, err := devicemapper.GetDeps(devname); err == nil {
-		// Access to more Debug output
-		logrus.Debugf("[devmapper] devicemapper.GetDeps() %s: %#v", devname, d)
+	if devinfo.Exists == 0 {
+		return nil
+ 	}
+	if err := devicemapper.RemoveDevice(devname); err != nil {
+		return err
 	}
-	if devinfo.Exists != 0 {
-		return devicemapper.RemoveDevice(devname)
+	if d, err := devicemapper.GetDeps(devname); err == nil {
+		logrus.Warnf("[devmapper] device %s still has %d active dependents", devname, d.Count)
 	}
-
 	return nil
 }
 
diff -aruN docker-1.7.1/pkg/devicemapper/devmapper_wrapper.go docker-1.7.1-go-1.5/pkg/devicemapper/devmapper_wrapper.go
--- docker-1.7.1/pkg/devicemapper/devmapper_wrapper.go	2015-07-14 20:41:25.000000000 +0200
+++ docker-1.7.1-go-1.5/pkg/devicemapper/devmapper_wrapper.go	2016-02-22 13:44:52.810197554 +0100
@@ -38,7 +38,10 @@
 */
 import "C"
 
-import "unsafe"
+import (
+	"reflect"
+	"unsafe"
+)
 
 type (
 	CDmTask C.struct_dm_task
@@ -184,13 +187,22 @@
 	if Cdeps == nil {
 		return nil
 	}
+
+	// golang issue: https://github.com/golang/go/issues/11925
+	hdr := reflect.SliceHeader{
+		Data: uintptr(unsafe.Pointer(uintptr(unsafe.Pointer(Cdeps)) + unsafe.Sizeof(*Cdeps))),
+		Len:  int(Cdeps.count),
+		Cap:  int(Cdeps.count),
+	}
+	devices := *(*[]C.uint64_t)(unsafe.Pointer(&hdr))
+
 	deps := &Deps{
 		Count:  uint32(Cdeps.count),
 		Filler: uint32(Cdeps.filler),
 	}
-	for _, device := range Cdeps.device {
-		deps.Device = append(deps.Device, (uint64)(device))
-	}
+	for _, device := range devices {
+		deps.Device = append(deps.Device, uint64(device))
+ 	}
 	return deps
 }