Thank you. Unfortunately I can't repeat it against bad12 either:

~~~~
~/src/curl$ src/curl -v bad12.haxx.se
* STATE: INIT => CONNECT handle 0x19c3438; line 1011 (connection #-5000)
* Rebuilt URL to: bad12.haxx.se/
* Hostname was NOT found in DNS cache
* Adding handle: conn: 0x19fd3b8
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* 0x19c3438 is at send pipe head!
* - Conn 0 (0x19fd3b8) send_pipe: 1, recv_pipe: 0
* STATE: CONNECT => WAITRESOLVE handle 0x19c3438; line 1042 (connection #0)
* Trying 80.67.4.176...
* STATE: WAITRESOLVE => WAITCONNECT handle 0x19c3438; line 1103 (connection #0)
* connect to 80.67.4.176 port 80 failed: Connection refused
* Trying 80.67.6.1...
* connect to 80.67.6.1 port 80 failed: Connection refused
* Trying 2a00:1a28:1200:9::1...
* Immediate connect fail for 2a00:1a28:1200:9::1: Network is unreachable
* Trying 2a00:1a28:1:2010::1...
* Immediate connect fail for 2a00:1a28:1:2010::1: Network is unreachable
* Failed to connect to bad12.haxx.se port 80: Connection refused
* Closing connection 0
* The cache now contains 0 members
* Expire cleared
curl: (7) Failed to connect to bad12.haxx.se port 80: Connection refused
~~~~

We need to pin down exactly which circumstance is triggering it. Can you show me your output against bad12?

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** [bugs:#1315] curl-7.34.0: hangs after hitting IPv6 address with no IPv6 available**
**Status:** open
**Created:** Tue Dec 24, 2013 04:00 PM UTC by Anthony G. Basile
**Last Updated:** Wed Dec 25, 2013 08:54 PM UTC
**Owner:** Bjorn Stenberg
This was hit on a gentoo system and the downstream report can be seen at
   https://bugs.gentoo.org/show_bug.cgi?id=495170
In brief, if curl 7.34.0 tries an ipv6 address when one isn't available, it falls into a loop and eats 100% cpu.  This issue is not reproduceable on 7.33.0.
Here we used c-ares-1.9.1, libidn-1.28, openssl-1.0.1e and zlib-1.2.8.
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