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This bug was initially created as a copy of Bug #2192559

Description of problem:
When the netlink socket of a port (used for receiving link up/down events) has the ENOBUFS error due to the kernel sending too many messages at once, ptp4l floods the system log with "port 1: unexpected socket error" messages and is not able to recover from the error.

Version-Release number of selected component (if applicable):
linuxptp-3.1.1-8

How reproducible:
always

Steps to Reproduce:
1. start ptp4l
2. suspend ptp4l
3. generate 100 link up/down events on a non-PTP interface with "ip link set"
4. resume ptp4l

Actual results:
ptp4l logging error message in an infinite loop

Expected results:
one error message and ptp4l recovering

Additional info:
Upstream fix: https://github.com/richardcochran/linuxptp/commit/ab19bb9a6f25fc13279a0382e46439aacbad761a

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (linuxptp bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6925