Plumbing context.Context to DecRef() and Release().

context is passed to DecRef() and Release() which is
needed for SO_LINGER implementation.

PiperOrigin-RevId: 324672584

pkg/sentry/fsimpl/testutil/kernel.go

@@ -127,7 +127,7 @@ func CreateTask(ctx context.Context, name string, tc *kernel.ThreadGroup, mntns
 		return nil, err
 	}
 	m := mm.NewMemoryManager(k, k, k.SleepForAddressSpaceActivation)
-	m.SetExecutable(fsbridge.NewVFSFile(exe))
+	m.SetExecutable(ctx, fsbridge.NewVFSFile(exe))
 
 	config := &kernel.TaskConfig{
 		Kernel:                  k,

pkg/sentry/fsimpl/testutil/testutil.go

@@ -97,8 +97,8 @@ func (s *System) WithTemporaryContext(ctx context.Context) *System {
 
 // Destroy release resources associated with a test system.
 func (s *System) Destroy() {
-	s.Root.DecRef()
-	s.MntNs.DecRef() // Reference on MntNs passed to NewSystem.
+	s.Root.DecRef(s.Ctx)
+	s.MntNs.DecRef(s.Ctx) // Reference on MntNs passed to NewSystem.
 }
 
 // ReadToEnd reads the contents of fd until EOF to a string.
@@ -149,7 +149,7 @@ func (s *System) ListDirents(pop *vfs.PathOperation) *DirentCollector {
 	if err != nil {
 		s.t.Fatalf("OpenAt for PathOperation %+v failed: %v", pop, err)
 	}
-	defer fd.DecRef()
+	defer fd.DecRef(s.Ctx)
 
 	collector := &DirentCollector{}
 	if err := fd.IterDirents(s.Ctx, collector); err != nil {