Custom plugin with two srcpads

[Marcin Kolny]

Hi, I'm trying to write my own plugin with one sink and two sources
(something like tee). So my chain function looks like this:

static GstFlowReturn
gst_my_filter_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
  GstMyFilter *filter;

  filter = GST_MYFILTER (parent);

  gst_buffer_ref(buf);
  gst_pad_push(filter->srcpad2, buf);
  return gst_pad_push (filter->srcpad1, buf);
}

I know, that this code is meaningless, but it's the simple code snippet,
which doesn't work for me. I saw in debugger, that a thread hangs up on a
line:
gst_pad_push(filter->srcpad2, buf);
When I didn't connect any element to a srcpad2 (I linked only srcpad1),
chain function didn't suspend, problem occurs, when two src pads are
connected.

I was looking at tee's code, and I can't see nothing special there. What is
wrong with my plugin?
Thanks for help

Best regards,
Marcin Kolny
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