Oracle Linux 7.3 - PTP Slave didn't Sync with Server and Logs "received SYNC without timestamp" Errors

(Doc ID 2309367.1)

Last updated on SEPTEMBER 22, 2017

Applies to:

Linux OS - Version Oracle Linux 7.3 with Unbreakable Enterprise Kerne [4.1.12] and later
Linux x86-64

Symptoms

Oracle Linux 7.3 server with UEK4 kernel configured as PTP slave reports following error and failed to synchronize with the PTP server, with the following errors logged:

Aug 7 15:08:21 FMA1 ptp4l: [227620.293] selected /dev/ptp4 as PTP clock
Aug 7 15:08:21 FMA1 ptp4l: [227620.294] port 1: INITIALIZING to LISTENING on INITIALIZE
Aug 7 15:08:21 FMA1 ptp4l: [227620.294] port 0: INITIALIZING to LISTENING on INITIALIZE
Aug 7 15:08:21 FMA1 ptp4l: [227620.538] port 1: received SYNC without timestamp
Aug 7 15:08:22 FMA1 ptp4l: [227621.038] port 1: received SYNC without timestamp
Aug 7 15:08:22 FMA1 phc2sys: [227621.293] Waiting for ptp4l...
Aug 7 15:08:22 FMA1 ptp4l: [227621.529] port 1: received SYNC without timestamp
Aug 7 15:08:23 FMA1 ptp4l: [227622.028] port 1: received SYNC without timestamp
Aug 7 15:08:23 FMA1 ptp4l: [227622.528] port 1: received SYNC without timestamp
Aug 7 15:08:24 FMA1 ptp4l: [227623.028] port 1: received SYNC without timestamp
Aug 7 15:08:24 FMA1 ptp4l: [227623.530] port 1: received SYNC without timestamp
Aug 7 15:08:25 FMA1 ptp4l: [227624.028] port 1: received SYNC without timestamp
Aug 7 15:08:25 FMA1 ptp4l: [227624.530] port 1: received SYNC without timestamp
Aug 7 15:08:26 FMA1 ptp4l: [227625.038] port 1: received SYNC without timestamp
Aug 7 15:08:26 FMA1 kernel: ixgbe 0000:04:00.0 eno49: clearing RX Timestamp hang

Cause

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