• Version: 1.19.1 (Node master)
• Platform: Windows 10

Hi everyone! I'm currently debugging some of my Node work, and I'm pretty sure uv_write() callbacks for Windows pipes don't always get called (even though the other side of the pipe fully received the data).

I'll try to get a pure libuv reproduction together, but the easiest way to reproduce would be something along the lines of adding a fprintf(stderr, "foobar\n"); to Node's LibuvStreamWrap::AfterWrite(), then running a test like test\parallel\test-cluster-cwd.js -- it writes data, the other side receives it, and it does use uv_write() for writing, but there's no extra output.