[tor-bugs] #9229 [Tor]: While bootstrapping, Tor clients stall for 60s when obfsproxy bridges are used.

[Tor Bug Tracker & Wiki]

#9229: While bootstrapping, Tor clients stall for 60s when obfsproxy bridges are
used.
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 Reporter:  phw                               |          Owner:  asn               
     Type:  defect                            |         Status:  needs_information 
 Priority:  normal                            |      Milestone:  Tor: 0.2.5.x-final
Component:  Tor                               |        Version:                    
 Keywords:  60s, consensus, stall, obfsproxy  |         Parent:                    
   Points:                                    |   Actualpoints:                    
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Comment(by phw):

 Replying to [comment:12 karsten]:

 > Huh, I wonder why nobody can reproduce the problem I'm seeing.
 Describing it in more detail.

 Alright, I can now reproduce; even with v0.2.4.16-rc (git-
 dcf6b6d7dda9ffbd). I missed that you '''only''' deleted `cached-*` files.
 Here's the log I get with your config. One can see the 60-second-wait.

 {{{
 Aug 22 11:40:46.442 [notice] Parsing GEOIP IPv6 file
 /usr/share/tor/geoip6.
 Aug 22 11:40:46.486 [notice] We were built to run on a 64-bit CPU, with
 OpenSSL 1.0.1 or later, but with a version of OpenSSL that apparently
 lacks accelerated support for the NIST P-224 and P-256 groups. Building
 openssl with such support (using the enable-ec_nistp_64_gcc_128 option
 when configuring it) would make ECDH much faster.
 Aug 22 11:40:47.506 [notice] Bootstrapped 5%: Connecting to directory
 server.
 Aug 22 11:40:47.639 [notice] Bootstrapped 10%: Finishing handshake with
 directory server.
 Aug 22 11:40:48.048 [notice] Learned fingerprint [scrubbed].
 Aug 22 11:40:48.048 [notice] Bootstrapped 15%: Establishing an encrypted
 directory connection.
 Aug 22 11:40:48.353 [notice] Bootstrapped 20%: Asking for networkstatus
 consensus.
 Aug 22 11:40:48.487 [notice] Bootstrapped 50%: Loading relay descriptors.
 Aug 22 11:40:48.755 [notice] new bridge descriptor [scrubbed].
 Aug 22 11:40:48.755 [notice] I learned some more directory information,
 but not enough to build a circuit: We have no usable consensus.
 Aug 22 11:41:50.359 [notice] I learned some more directory information,
 but not enough to build a circuit: We have no usable consensus.
 Aug 22 11:41:50.891 [notice] I learned some more directory information,
 but not enough to build a circuit: We need more microdescriptors: we have
 0/4314, and can only build 0% of likely paths. (We have 0% of guards bw,
 0% of midpoint bw, and 0% of exit bw.)
 Aug 22 11:41:52.506 [notice] We now have enough directory information to
 build circuits.
 Aug 22 11:41:52.506 [notice] Bootstrapped 80%: Connecting to the Tor
 network.
 Aug 22 11:41:52.511 [notice] Bootstrapped 90%: Establishing a Tor circuit.
 Aug 22 11:41:53.921 [notice] Tor has successfully opened a circuit. Looks
 like client functionality is working.
 Aug 22 11:41:53.921 [notice] Bootstrapped 100%: Done.
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9229#comment:13>
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