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[curl:bugs] #1317 7.34.0 + AsynchDNS results in hang + high cpu

From: Daniel Stenberg <bagder_at_users.sf.net>
Date: Tue, 31 Dec 2013 15:12:54 +0000

- **status**: pending --> closed-duplicate

---
** [bugs:#1317] 7.34.0 + AsynchDNS results in hang + high cpu**
**Status:** closed-duplicate
**Created:** Mon Dec 30, 2013 11:45 AM UTC by ricker
**Last Updated:** Mon Dec 30, 2013 12:29 PM UTC
**Owner:** Daniel Stenberg
After upgrading from 7.33 to 7.34, with AsynchDNS, requests to external sites now result in a hang with high cpu usage. Compiling without AsynchDNS does not exhibit this problem.
~~~~~~
$ curl -v http://www.google.com/
* Hostname was NOT found in DNS cache
* Adding handle: conn: 0x7fb11c007c00
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0x7fb11c007c00) send_pipe: 1, recv_pipe: 0
*   Trying 2607:f8b0:4007:803::1014...
* Immediate connect fail for 2607:f8b0:4007:803::1014: No route to host
^C
~~~~~~
Tested on Mac OS X 10.7.5 and 10.9.1
~~~~~~
$ curl -V
curl 7.34.0 (x86_64-apple-darwin11.4.2) libcurl/7.34.0 OpenSSL/1.0.1e zlib/1.2.8 c-ares/1.7.5 libidn/1.26
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp smtp smtps telnet tftp
Features: AsynchDNS IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP
~~~~~~
Bug was initially reported here:
https://trac.macports.org/ticket/41971
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Received on 2013-12-31

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