.

wcfs/client/wcfs.cpp

@@ -335,7 +335,8 @@ pair<FileH, error> _Conn::open(zodb::Oid foid) {
     f->blksize    = st.st_blksize;
     f->_headfsize = st.st_size;
     if (!(f->_headfsize % f->blksize == 0))
-        return make_pair(nil, E(fmt::errorf("wcfs bug: head/file size %% blksize != 0")));
+        return make_pair(nil, E(fmt::errorf("wcfs bug: %s size (%d) %% blksize (%d) != 0",
+                                    v(f->_headf->name()), f->_headfsize, f->blksize)));
 
     wconn._filehtab[foid] = f;
     defer([&]() {