diff --git a/pkg/blockcontroller/blockcontroller.go b/pkg/blockcontroller/blockcontroller.go
index 524a66c10b..48ba01bb70 100644
--- a/pkg/blockcontroller/blockcontroller.go
+++ b/pkg/blockcontroller/blockcontroller.go
@@ -19,6 +19,7 @@ import (
 	"github.com/wavetermdev/waveterm/pkg/jobcontroller"
 	"github.com/wavetermdev/waveterm/pkg/remote"
 	"github.com/wavetermdev/waveterm/pkg/remote/conncontroller"
+	"github.com/wavetermdev/waveterm/pkg/util/ds"
 	"github.com/wavetermdev/waveterm/pkg/util/shellutil"
 	"github.com/wavetermdev/waveterm/pkg/wavebase"
 	"github.com/wavetermdev/waveterm/pkg/waveobj"
@@ -75,10 +76,17 @@ type Controller interface {
 
 // Registry for all controllers
 var (
-	controllerRegistry = make(map[string]Controller)
-	registryLock       sync.RWMutex
+	controllerRegistry  = make(map[string]Controller)
+	registryLock        sync.RWMutex
+	blockResyncMutexMap = ds.MakeSyncMap[*sync.Mutex]()
 )
 
+func getBlockResyncMutex(blockId string) *sync.Mutex {
+	return blockResyncMutexMap.GetOrCreate(blockId, func() *sync.Mutex {
+		return &sync.Mutex{}
+	})
+}
+
 // Registry operations
 func getController(blockId string) Controller {
 	registryLock.RLock()
@@ -145,6 +153,10 @@ func ResyncController(ctx context.Context, tabId string, blockId string, rtOpts
 		return fmt.Errorf("invalid tabId or blockId passed to ResyncController")
 	}
 
+	mu := getBlockResyncMutex(blockId)
+	mu.Lock()
+	defer mu.Unlock()
+
 	blockData, err := wstore.DBMustGet[*waveobj.Block](ctx, blockId)
 	if err != nil {
 		return fmt.Errorf("error getting block: %w", err)
diff --git a/pkg/blockcontroller/durableshellcontroller.go b/pkg/blockcontroller/durableshellcontroller.go
index a208a3df75..d3481b172d 100644
--- a/pkg/blockcontroller/durableshellcontroller.go
+++ b/pkg/blockcontroller/durableshellcontroller.go
@@ -163,7 +163,7 @@ func (dsc *DurableShellController) Start(ctx context.Context, blockMeta waveobj.
 
 	if jobId == "" {
 		log.Printf("block %q starting new durable shell\n", dsc.BlockId)
-		newJobId, err := dsc.startNewJob(ctx, blockMeta, dsc.ConnName)
+		newJobId, err := dsc.startNewJob(ctx, blockMeta, dsc.ConnName, rtOpts)
 		if err != nil {
 			return fmt.Errorf("failed to start new job: %w", err)
 		}
@@ -218,11 +218,14 @@ func (dsc *DurableShellController) SendInput(inputUnion *BlockInputUnion) error
 	return jobcontroller.SendInput(context.Background(), data)
 }
 
-func (dsc *DurableShellController) startNewJob(ctx context.Context, blockMeta waveobj.MetaMapType, connName string) (string, error) {
+func (dsc *DurableShellController) startNewJob(ctx context.Context, blockMeta waveobj.MetaMapType, connName string, rtOpts *waveobj.RuntimeOpts) (string, error) {
 	termSize := waveobj.TermSize{
 		Rows: shellutil.DefaultTermRows,
 		Cols: shellutil.DefaultTermCols,
 	}
+	if rtOpts != nil && rtOpts.TermSize.Rows > 0 && rtOpts.TermSize.Cols > 0 {
+		termSize = rtOpts.TermSize
+	}
 	cmdStr := blockMeta.GetString(waveobj.MetaKey_Cmd, "")
 	cwd := blockMeta.GetString(waveobj.MetaKey_CmdCwd, "")
 	opts, err := remote.ParseOpts(connName)
diff --git a/pkg/util/ds/syncmap.go b/pkg/util/ds/syncmap.go
index a422343ac5..99b4095efc 100644
--- a/pkg/util/ds/syncmap.go
+++ b/pkg/util/ds/syncmap.go
@@ -62,3 +62,14 @@ func (sm *SyncMap[T]) TestAndSet(key string, newValue T, testFn func(T, bool) bo
 	}
 	return false
 }
+
+func (sm *SyncMap[T]) GetOrCreate(key string, createFn func() T) T {
+	sm.lock.Lock()
+	defer sm.lock.Unlock()
+	if v, ok := sm.m[key]; ok {
+		return v
+	}
+	v := createFn()
+	sm.m[key] = v
+	return v
+}