On Tue, Feb 18, 2020 at 1:51 AM Andrei Vagin <avagin@gmail.com> wrote:
>
> This patch breaks one of CRIU tests. Here is a small reproducer:

Good catch.

> The quick fix looks like this:

That one works, but is not really right.

The things that change the number of readers or writers should simply
use "wake_up_all()".

I thought we did that already, but no - there _was_ one place where we
did it, but that was for the pipe buffer size case, and in that case
it's actually pointless. That case acts just like a "new space or data
was added"

So I think the right fix is the attached patch. Since you had such a
lovely test-case, let me go test it too ;)

                Linus