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[curl:bugs] #1315 curl-7.34.0: hangs after hitting IPv6 address with no IPv6 available

From: Daniel Stenberg <bagder_at_users.sf.net>
Date: Tue, 24 Dec 2013 22:24:50 +0000

Yes, the original reporter says it is a busy-loop in there but doesn't disclose any details of that. Björn's test case seems to at least show that this problem is not easy to repeat with "just" the non-working IPv6 address as a condition.

If the original reporter can repeat this problem, it would be useful to see a gdb trace while single-stepping through the code that shows it looping and possibly showing some contents of local variables that make the code take that decision.

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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:** Tue Dec 24, 2013 09:32 PM UTC
**Owner:** nobody
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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Received on 2013-12-24

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