diff --git a/runtime/v2/binary.go b/runtime/v2/binary.go
index 4b3f4ab93..49ecd80e9 100644
--- a/runtime/v2/binary.go
+++ b/runtime/v2/binary.go
@@ -115,6 +115,7 @@ func (b *binary) Start(ctx context.Context, opts *types.Any, onClose func()) (_
 	onCloseWithShimLog := func() {
 		onClose()
 		cancelShimLog()
+		f.Close()
 	}
 	client := ttrpc.NewClient(conn, ttrpc.WithOnClose(onCloseWithShimLog))
 	return &shim{
diff --git a/runtime/v2/shim.go b/runtime/v2/shim.go
index 9a6b0ec70..7dc218dd2 100644
--- a/runtime/v2/shim.go
+++ b/runtime/v2/shim.go
@@ -76,7 +76,13 @@ func loadShim(ctx context.Context, bundle *Bundle, events *exchange.Exchange, rt
 			conn.Close()
 		}
 	}()
-	f, err := openShimLog(ctx, bundle, client.AnonReconnectDialer)
+	shimCtx, cancelShimLog := context.WithCancel(ctx)
+	defer func() {
+		if err != nil {
+			cancelShimLog()
+		}
+	}()
+	f, err := openShimLog(shimCtx, bundle, client.AnonReconnectDialer)
 	if err != nil {
 		return nil, errors.Wrap(err, "open shim log pipe")
 	}
@@ -99,8 +105,12 @@ func loadShim(ctx context.Context, bundle *Bundle, events *exchange.Exchange, rt
 			}
 		}
 	}()
-
-	client := ttrpc.NewClient(conn, ttrpc.WithOnClose(onClose))
+	onCloseWithShimLog := func() {
+		onClose()
+		cancelShimLog()
+		f.Close()
+	}
+	client := ttrpc.NewClient(conn, ttrpc.WithOnClose(onCloseWithShimLog))
 	defer func() {
 		if err != nil {
 			client.Close()
diff --git a/runtime/v2/shim_unix.go b/runtime/v2/shim_unix.go
index 16e9c7be3..898839bd4 100644
--- a/runtime/v2/shim_unix.go
+++ b/runtime/v2/shim_unix.go
@@ -30,7 +30,7 @@ import (
 )
 
 func openShimLog(ctx context.Context, bundle *Bundle, _ func(string, time.Duration) (net.Conn, error)) (io.ReadCloser, error) {
-	return fifo.OpenFifo(ctx, filepath.Join(bundle.Path, "log"), unix.O_RDONLY|unix.O_CREAT|unix.O_NONBLOCK, 0700)
+	return fifo.OpenFifo(ctx, filepath.Join(bundle.Path, "log"), unix.O_RDWR|unix.O_CREAT|unix.O_NONBLOCK, 0700)
 }
 
 func checkCopyShimLogError(ctx context.Context, err error) error {