[tor-bugs] #24500 [Core Tor/Tor]: Confusing log message "Can't get entropy from getrandom()"

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#24500: Confusing log message "Can't get entropy from getrandom()"
------------------------------+--------------------
     Reporter:  arma          |      Owner:  (none)
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------
 A relay operator on #tor shared these log lines:
 {{{
 Dec 01 16:33:00.000 [notice] Tor 0.3.1.8 (git-868c1b2b1eb7225a) opening
 log file.
 Dec 01 16:33:00.515 [warn] Can't get entropy from getrandom().
 Dec 01 16:33:00.534 [notice] Tor 0.3.1.8 (git-868c1b2b1eb7225a) running on
 Linux with Libevent 2.0.21-stable, OpenSSL 1.0.2g, Zlib 1.2.8, Liblzma
 5.1.0alpha[...]
 }}}

 The middle line is confusing -- why can't we get the entropy from it? Does
 that mean Tor has failed at something important? What should the relay
 operator do?

 If the relay operator shouldn't do anything, because it's fine, this
 should be a notice or less. If the relay operator ought to do something,
 because it's not fine, then we should suggest what to do and/or what the
 problem is with doing nothing.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24500>
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