diff --git a/executor/containerdexecutor/executor.go b/executor/containerdexecutor/executor.go
index 308371f7100b0..3be6d1a6f4974 100644
--- a/executor/containerdexecutor/executor.go
+++ b/executor/containerdexecutor/executor.go
@@ -19,6 +19,7 @@ import (
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/moby/buildkit/executor"
 	"github.com/moby/buildkit/executor/oci"
+	"github.com/moby/buildkit/frontend/gateway/client"
 	"github.com/moby/buildkit/identity"
 	"github.com/moby/buildkit/snapshot"
 	"github.com/moby/buildkit/solver/errdefs"
@@ -380,7 +381,7 @@ func (w *containerdExecutor) runProcess(ctx context.Context, p containerd.Proces
 					ExitCode: status.ExitCode(),
 					Err:      status.Error(),
 				}
-				if status.ExitCode() == errdefs.ContainerdUnknownExitStatus && status.Error() != nil {
+				if status.ExitCode() == client.UnknownExitStatus && status.Error() != nil {
 					exitErr.Err = errors.Wrap(status.Error(), "failure waiting for process")
 				}
 				select {
diff --git a/executor/runcexecutor/executor.go b/executor/runcexecutor/executor.go
index 62c2891a57287..6665d2cab4b2e 100644
--- a/executor/runcexecutor/executor.go
+++ b/executor/runcexecutor/executor.go
@@ -19,6 +19,7 @@ import (
 	"github.com/docker/docker/pkg/idtools"
 	"github.com/moby/buildkit/executor"
 	"github.com/moby/buildkit/executor/oci"
+	"github.com/moby/buildkit/frontend/gateway/client"
 	"github.com/moby/buildkit/identity"
 	"github.com/moby/buildkit/solver/errdefs"
 	"github.com/moby/buildkit/solver/pb"
@@ -334,7 +335,7 @@ func (w *runcExecutor) Run(ctx context.Context, id string, root executor.Mount,
 func exitError(ctx context.Context, err error) error {
 	if err != nil {
 		exitErr := &errdefs.ExitError{
-			ExitCode: errdefs.ContainerdUnknownExitStatus,
+			ExitCode: client.UnknownExitStatus,
 			Err:      err,
 		}
 		var runcExitError *runc.ExitError
diff --git a/frontend/gateway/client/client.go b/frontend/gateway/client/client.go
index 09d86cad820c1..8193a3038b3b2 100644
--- a/frontend/gateway/client/client.go
+++ b/frontend/gateway/client/client.go
@@ -12,6 +12,16 @@ import (
 	fstypes "github.com/tonistiigi/fsutil/types"
 )
 
+const (
+	// UnknownExitStatus might be returned in (*errdefs.ExitError).ExitCode via
+	// ContainerProcess.Wait.  This can happen if the process never starts
+	// or if an error was encountered when obtaining the exit status, it is set to 255.
+	//
+	// This const is defined here to prevent importing github.com/containerd/containerd
+	// and corresponds with https://github.com/containerd/containerd/blob/40b22ef0741028917761d8c5d5d29e0d19038836/task.go#L52-L55
+	UnknownExitStatus = 255
+)
+
 type Client interface {
 	Solve(ctx context.Context, req SolveRequest) (*Result, error)
 	ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt) (digest.Digest, []byte, error)
diff --git a/frontend/gateway/gateway.go b/frontend/gateway/gateway.go
index 4067f87f10eb6..fd30b52e990bc 100644
--- a/frontend/gateway/gateway.go
+++ b/frontend/gateway/gateway.go
@@ -1169,7 +1169,7 @@ func (lbf *llbBridgeForwarder) ExecProcess(srv pb.LLBBridge_ExecProcessServer) e
 					var exitError *errdefs.ExitError
 					var statusError *rpc.Status
 					if err != nil {
-						statusCode = errdefs.ContainerdUnknownExitStatus
+						statusCode = gwclient.UnknownExitStatus
 						st, _ := status.FromError(grpcerrors.ToGRPC(err))
 						stp := st.Proto()
 						statusError = &rpc.Status{
diff --git a/frontend/gateway/grpcclient/client.go b/frontend/gateway/grpcclient/client.go
index 84a2767306c6d..3c49eb3176c44 100644
--- a/frontend/gateway/grpcclient/client.go
+++ b/frontend/gateway/grpcclient/client.go
@@ -882,7 +882,7 @@ func (ctr *container) Start(ctx context.Context, req client.StartRequest) (clien
 					Message: exit.Error.Message,
 					Details: convertGogoAny(exit.Error.Details),
 				}))
-				if exit.Code != errdefs.ContainerdUnknownExitStatus {
+				if exit.Code != client.UnknownExitStatus {
 					exitError = &errdefs.ExitError{ExitCode: exit.Code, Err: exitError}
 				}
 			} else if serverDone := msg.GetDone(); serverDone != nil {
diff --git a/hack/util b/hack/util
index d6d342d1e7673..e84928f801d07 100755
--- a/hack/util
+++ b/hack/util
@@ -14,7 +14,7 @@ if [ "$CONTINUOUS_INTEGRATION" = "true" ] || [ "$CI" = "true" ]; then
   progressFlag="--progress=plain"
 fi
 
-buildmode="buildkit"
+buildmode="docker-buildkit"
 buildxCmd() {
   if docker buildx version >/dev/null 2>&1; then
     set -x
diff --git a/solver/errdefs/exit.go b/solver/errdefs/exit.go
index 696fe25563eed..cab7709c57778 100644
--- a/solver/errdefs/exit.go
+++ b/solver/errdefs/exit.go
@@ -2,16 +2,6 @@ package errdefs
 
 import "fmt"
 
-const (
-	// ContainerdUnknownExitStatus is returned when containerd is unable to
-	// determine the exit status of a process. This can happen if the process never starts
-	// or if an error was encountered when obtaining the exit status, it is set to 255.
-	//
-	// This const is defined here to prevent importing github.com/containerd/containerd
-	// and corresponds with https://github.com/containerd/containerd/blob/40b22ef0741028917761d8c5d5d29e0d19038836/task.go#L52-L55
-	ContainerdUnknownExitStatus = 255
-)
-
 // ExitError will be returned when the container process exits with a non-zero
 // exit code.
 type ExitError struct {
diff --git a/worker/tests/common.go b/worker/tests/common.go
index 6160523df58b6..333de9c020100 100644
--- a/worker/tests/common.go
+++ b/worker/tests/common.go
@@ -22,7 +22,7 @@ import (
 )
 
 func NewBusyboxSourceSnapshot(ctx context.Context, t *testing.T, w *base.Worker, sm *session.Manager) cache.ImmutableRef {
-	img, err := source.NewImageIdentifier("docker.io/library/busybox:latest")
+	img, err := source.NewImageIdentifier("docker-hub.netflix.net/library/busybox:latest")
 	require.NoError(t, err)
 	src, err := w.SourceManager.Resolve(ctx, img, sm, nil)
 	require.NoError(t, err)