[tor-relays] assign_to_cpuworker failed. Ignoring.

[Felix]

Hi everybody

May be someone can help with this warning:

The security update (Tor v0.2.8.9 running on FreeBSD with Libevent 
2.0.22-stable, OpenSSL LibreSSL 2.4.3 and Zlib 1.2.8.) shows the 
following log entry each hour:

Oct 19 02:51:07.000 [warn] Your system clock just jumped 136 seconds 
forward; assuming established circuits no longer work.
Oct 19 02:51:07.000 [warn] assign_to_cpuworker failed. Ignoring.
...
Oct 19 02:51:07.000 [warn] assign_to_cpuworker failed. Ignoring.
Oct 19 02:51:15.000 [notice] Tor has successfully opened a circuit. 
Looks like client functionality is working.
...
Oct 19 03:51:10.000 [warn] Your system clock just jumped 138 seconds 
forward; assuming established circuits no longer work.
Oct 19 03:51:11.000 [warn] assign_to_cpuworker failed. Ignoring.
...
Oct 19 04:50:37.000 [warn] Your system clock just jumped 105 seconds 
forward; assuming established circuits no longer work.
Oct 19 04:50:37.000 [warn] assign_to_cpuworker failed. Ignoring.
...
Oct 19 05:51:14.000 [warn] Your system clock just jumped 142 seconds 
forward; assuming established circuits no longer work.
Oct 19 05:51:15.000 [warn] assign_to_cpuworker failed. Ignoring.
...

The warning first appeared on 2.8.7 after update on September 13th (Tor 
v0.2.8.7 running on FreeBSD with Libevent 2.0.22-stable, OpenSSL 
LibreSSL 2.4.2 and Zlib 1.2.8.). That time I switched back (Tor v0.2.7.6 
running on FreeBSD with Libevent 2.0.22-stable, OpenSSL LibreSSL 2.4.2 
and Zlib 1.2.8.) and the warning disappeared.

What can I do?

The warning is reproted in tor-talk:
https:// lists.torproject.org/pipermail/tor-talk/2016-October/042425.html

-- 
Best regards, Felix