Millions of lines of "dhcpcd[365]: received SIGPIPE" in syslog file

[hal_sk]

Hello,
My Raspberry Pi with openhabian is connected to internet via USB GSM modem. Recently my modem disconnects from the internet from unknown reason at around 00:30 AM and then connects back online at around 06:00 AM. To my horror the syslog file is around 250 MB big in size and contains millions lines containing this string: "dhcpcd[365]: received SIGPIPE". Few hundreds these lines per one second. I suspect some issue with scripts related to my modem. What could be the problem?

 

[hal_sk]

Additional info:
In syslog there is sometime also this segment of lines repeating in a loop:

Dec  9 14:23:25 openhabian systemd[1]: comitup-web.service: Main process exited, code=exited, status=1/FAILURE
Dec  9 14:23:25 openhabian systemd[1]: comitup-web.service: Failed with result 'exit-code'.
Dec  9 14:23:31 openhabian systemd[1]: comitup-web.service: Scheduled restart job, restart counter is at 1422.
Dec  9 14:23:31 openhabian systemd[1]: Stopped Comitup Web Service.
Dec  9 14:23:31 openhabian systemd[1]: Started Comitup Web Service.
Dec  9 14:23:31 openhabian comitup-web[21589]: Traceback (most recent call last):
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/sbin/comitup-web", line 11, in <module>
Dec  9 14:23:31 openhabian comitup-web[21589]:     load_entry_point('comitup==1.31', 'console_scripts', 'comitup-web')()
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/share/comitup/web/comitupweb.py", line 171, in main
Dec  9 14:23:31 openhabian comitup-web[21589]:     ciu_client.ciu_points()
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 141, in __call__
Dec  9 14:23:31 openhabian comitup-web[21589]:     return self._connection.call_blocking(self._named_service,
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3/dist-packages/dbus/connection.py", line 652, in call_blocking
Dec  9 14:23:31 openhabian comitup-web[21589]:     reply_message = self.send_message_with_reply_and_block(
Dec  9 14:23:31 openhabian comitup-web[21589]: dbus.exceptions.DBusException: org.freedesktop.DBus.Python.BrokenPipeError: Traceback (most recent call last):
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3/dist-packages/dbus/service.py", line 711, in _message_cb
Dec  9 14:23:31 openhabian comitup-web[21589]:     retval = candidate_method(self, *args, **keywords)
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/share/comitup/comitup/statemgr.py", line 71, in access_points
Dec  9 14:23:31 openhabian comitup-web[21589]:     aps = iwscan.candidates()
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/share/comitup/comitup/iwscan.py", line 106, in candidates
Dec  9 14:23:31 openhabian comitup-web[21589]:     p.start()
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3.9/multiprocessing/process.py", line 121, in start
Dec  9 14:23:31 openhabian comitup-web[21589]:     self._popen = self._Popen(self)
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3.9/multiprocessing/context.py", line 224, in _Popen
Dec  9 14:23:31 openhabian comitup-web[21589]:     return _default_context.get_context().Process._Popen(process_obj)
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3.9/multiprocessing/context.py", line 277, in _Popen
Dec  9 14:23:31 openhabian comitup-web[21589]:     return Popen(process_obj)
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3.9/multiprocessing/popen_fork.py", line 16, in __init__
Dec  9 14:23:31 openhabian comitup-web[21589]:     util._flush_std_streams()
Dec  9 14:23:31 openhabian comitup-web[21589]:   File "/usr/lib/python3.9/multiprocessing/util.py", line 435, in _flush_std_streams
Dec  9 14:23:31 openhabian comitup-web[21589]:     sys.stdout.flush()
Dec  9 14:23:31 openhabian comitup-web[21589]: BrokenPipeError: [Errno 32] Broken pipe

 

[hal_sk]

I have disabled "comitup-web.service". Will se if it helps and if it does not break the system.

 

[hal_sk]

So it did not help. After 00:30 AM it still disconnects from internet and getting these logs bellow.
Is there a way to disable "dhcpcd" service (or what is it?) ?

 

[NORD]

You might want to repost this here....
Openhabian <----Link

 

[hal_sk]

You might want to repost this here....
Openhabian <----Link

I have already asked about this issue on that forum website. Based on that I guess my USB modem setup (without router providing static IP) is not supported in Openhab. As possible solution I am buying router for SIM cards and will try connect my Raspberry to that router with IP address set to be always same. Will see if it helps.