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Subject: Re: time stamp on vxWorks jumping to the future
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: Michael Davidsaver <mdavidsaver@gmail.com>
Cc: tech-talk@aps.anl.gov
Date: Mon, 27 Nov 2017 09:47:37 +0100


On 24.11.2017 17:04, Michael Davidsaver wrote:
On 11/24/2017 01:50 AM, Dirk Zimoch wrote:
On 20.11.2017 11:10, Dirk Zimoch wrote:
Hello everyone,

From time to time we see a strange problem with the timestamp on our
vxWorks 5.5 IOCs. The timestamp jumps to the future (e.g. 2071). I have
seen it happen on EPICS 3.14.12 as well as 3.14.8. Not all but more than
one IOC seem to be affected from such an incident. Not all jump to the
same future time.

Has anyone else seen this effect?
Can a corrupted NTP message cause this?

Dirk


Example:
ZPSAF15-VME > NTPTime_Report 1
NTP driver is synchronized with server
Syncronization interval = 60.0 seconds
Last synchronized at 2017-11-24 08:45:29.149741
OS tick rate = 100 Hz (nominal)
Measured tick rate = 100.024 Hz
NTP Server = 129.129.190.1
value = 0 = 0x0
ZPSAF15-VME > date
2073/05/20 11:20:31.396217
value = 27 = 0x1b

Time jumped this night, only on this IOC.

Are there other time providers in this IOC?  What does
"generalTimeReport 5" show?


The system has been restarted meanwhile, but here is the report:

ZPSAF15-VME > generalTimeReport 5
Backwards time errors prevented 2169 times.

Current Time Providers:
    "NTP", priority = 100
        Current Time is 2017-11-27 09:46:31.885855.
    "OS Clock", priority = 999
        Current Time is 2017-11-27 09:46:31.885192.

Event Time Providers:
        No Providers registered.
value = 0 = 0x0

Replies:
Re: time stamp on vxWorks jumping to the future Michael Davidsaver
References:
time stamp on vxWorks jumping to the future Dirk Zimoch
Re: time stamp on vxWorks jumping to the future Dirk Zimoch
Re: time stamp on vxWorks jumping to the future Michael Davidsaver

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