.

wcfs/internal/δbtree/δbtree.go

@@ -63,7 +63,7 @@ func NewPathSet() *PathSet {
 //
 // XXX catch cycles on add?
 func (m *PathSet) Add(master interface{}, path []zodb.IPersistent) {
-	fmt.Printf("\n\nPathSet.Add %v %s\n", master, path)
+	//fmt.Printf("\n\nPathSet.Add %v %s\n", master, path)
 
 	l := len(path)
 	if l == 0 {

wcfs/wcfs.go

@@ -698,16 +698,39 @@ func (root *Root) zδhandle1(zevent zodb.CommitEvent) {
 				return file.invalidateBlk(ctx, blk)
 			})
 		}
+	}
+	err := wg.Wait()
+	if err != nil {
+		panic(err)	// XXX
+	}
 
 	// invalidate kernel cache for attributes
 	// we need to do it only if we see topoligy (i.e. btree) change
-		if finv.size {
+	//
+	// do it after completing data invalidations, else the kernel might get
+	// stuck while we try to retrieve cache in invalidateBlk.
+	//
+	// XXX recheck ^^^ - we were stuck this way:
+	// wcfs: 19:42:23.335790 tx 0:     NOTIFY_INVAL_INODE, {i8 [-1 +-1)}
+	// wcfs: 19:42:23.335800 Response: INODE_NOTIFY OK
+	// wcfs: 19:42:23.335817 tx 0:     NOTIFY_RETRIEVE_CACHE, {> 0: i8 [2097152 +2097152)}
+	// wcfs: 19:42:23.335866 Response: NOTIFY_RETRIEVE_CACHE: OK
+	//	---- stuck here without kernel response ----
+	// wcfs: 19:42:28.588168 rx 58: INTERRUPT i0
+	// wcfs: 19:42:28.588232 Unimplemented opcode INTERRUPT
+	// wcfs: 19:42:28.588288 tx 58:     38=function not implemented
+	//
+	// XXX invalidateBlk gets stuck even without invalidateAttr.
+	wg, ctx = errgroup.WithContext(context.TODO())
+	for file, finv := range toinvalidate {
+		if !finv.size {
+			continue
+		}
 		wg.Go(func() error {
 			return file.invalidateAttr()
 		})
 	}
-	}
-	err := wg.Wait()
+	err = wg.Wait()
 	if err != nil {
 		panic(err)	// XXX
 	}

wcfs/zblk.go

@@ -510,12 +510,12 @@ func (bf *ZBigFile) Size(ctx context.Context) (_ int64, treePath []zodb.IPersist
 	}
 	defer bf.PDeactivate()
 
-	fmt.Printf("\n\n\nSize ...\n")
+	//fmt.Printf("\n\n\nSize ...\n")
 	tailblk, ok, err := bf.blktab.VMaxKey(ctx, func(node zodb.IPersistent) {
-		fmt.Printf("visit %v\n", node)
+		//fmt.Printf("visit %v\n", node)
 		treePath = append(treePath, node)
 	})
-	fmt.Printf("end Size (%v)\n", treePath)
+	//fmt.Printf("end Size (%v)\n", treePath)
 	if err != nil{
 		return 0, nil, err
 	}