[tor-bugs] #24455 [Core Tor/Tor]: clock tick backwards in the tor log

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#24455: clock tick backwards in the tor log
------------------------------+--------------------
     Reporter:  darkk         |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------
 While checking various data for #23838 I've found some cases of logs with
 clock ticking backwards
 [https://explorer.ooni.torproject.org/measurement/20161012T024947Z_AS30722_f5qzz4lFUyWAIsaBipwkjXhNSuYn5S840SyVpJmFDn1AFcv1ws
 a bit].

 {{{
 Oct 12 04:53:01.000 [notice] Tor 0.2.7.6 opening new log file.
 Oct 12 04:53:00.963 [warn] OpenSSL version from headers does not match the
 version we're running with. If you get weird crashes, that might be why.
 (Compiled with 1000205f: OpenSSL 1.0.2e 3 Dec 2015; running with 1000208f:
 OpenSSL 1.0.2h  3 May 2016).
 Oct 12 04:53:00.995 [notice] Tor v0.2.7.6 running on Darwin with Libevent
 2.0.22-stable, OpenSSL 1.0.2h and Zlib 1.2.5.
 Oct 12 04:53:00.995 [notice] Tor can't help you if you use it wrong! Learn
 how to be safe at https://www.torproject.org/download/download#warning
 Oct 12 04:53:00.995 [notice] Configuration file "/non-existant" not
 present, using reasonable defaults.
 Oct 12 04:53:00.999 [notice] Opening Socks listener on 127.0.0.1:16025
 Oct 12 04:53:00.999 [notice] Opening Control listener on 127.0.0.1:4367
 Oct 12 04:53:01.000 [notice] Parsing GEOIP IPv4 file
 /usr/local/Cellar/tor/0.2.7.6/share/tor/geoip.
 Oct 12 04:53:01.000 [notice] Parsing GEOIP IPv6 file
 /usr/local/Cellar/tor/0.2.7.6/share/tor/geoip6.
 Oct 12 04:53:02.000 [notice] Bootstrapped 0%: Starting
 }}}

 I looked at `tor/src/common/log.c`:`log_prefix_()` and, seems, this is NOT
 a bug in
 [https://gitweb.torproject.org/tor.git/commit/?id=8c5ba9388bd372316cc18f23dcb6d41b4c1e9546
 rounding]. But maybe I'm wrong. Karsten, please, tell me if you need more
 logs like that to understand the issue better. Maybe it's really just OS
 clocks ticking  backwards during the test, so feel free to close if you
 don't consider alike logs interesting.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24455>
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