Оно самое тоже
The clksync_qfx process calls clksync_phy_driver_enable_tc_per_port to use the IFD that has transitioned to the UP state. The issue seems to becaused by the fact that the FPC that is calling the function is FPC 0,while the ifd resides on another FPC (1, in our case). As the request fails, the interface that was recently activated is not recognised as upby the process.
I have found an internal PR, PR 1280282 - observing syslog error "fpc1 clksync_phy_driver_enable_tc_per_port: Failed to get PIC from ifd" for the same issue as the one reported by you. According to the PR, the fix will be present in the following Junos releases: Junos 17.2R3, Junos 17.3R2, Junos 17.3R3, Junos 17.4R2, Junos 18.1 .