The cause of stuck is that 1) stream_id does not reset and 2) underlying recv/send functions point to somewhere else.
Patch attached (which modifies the original patch slightly)

Attachment: reset_stream_id_and_fix_underlyng_transport.patch (5.2 kB; text/x-patch)

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** [bugs:#1374] http2 doesn't do connection re-use**
**Status:** open-confirmed
**Labels:** http2 connections 
**Created:** Tue May 20, 2014 10:26 AM UTC by Daniel Stenberg
**Last Updated:** Tue May 20, 2014 10:26 AM UTC
**Owner:** Daniel Stenberg
Command line use to repeat the problem:
./src/curl --http2 -s https://nghttp2.org https://nghttp2.org --trace-ascii dump --trace-time > /dev/null
I'm attaching a work in progress patch
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