Raspberry Pi 4: DHCPCD route socket overflowed

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#4,092 25 comments 31 reactions 0 assignees View on GitHub

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Assessment

Difficulty
5/5
Estimated time
Over a week
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
docker, linux, raspberry-pi
Domain
embedded-iot, networking, operating-systems

Research direction

Start with the supplied dhcpcd status output and the Raspberry Pi OS, firmware, and kernel details; no source file or test is named. Reproduce the intermittent IPv6 loss and route-socket overflow if possible, then identify the root cause and document a verified fix or escalation.

Written by the indexing model from the issue text.

Description

Describe the bug
Every now and then my Pi is loosing it's IPv6. I found out that I can fix the issue temporarily via systemctl restart dhcpcd. Today it happened again and I used systemctl status dhcpcd to look at the state. I got the following output:

Warning: The unit file, source configuration file or drop-ins of dhcpcd.service changed on disk. Run 'systemctl daemon-reload' to reload units.
● dhcpcd.service - dhcpcd on all interfaces
   Loaded: loaded (/lib/systemd/system/dhcpcd.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/system/dhcpcd.service.d
           └─wait.conf
   Active: failed (Result: signal) since Fri 2021-01-22 15:36:35 CET; 1 day 6h ago
  Process: 340 ExecStart=/usr/lib/dhcpcd5/dhcpcd -q -w (code=exited, status=0/SUCCESS)
 Main PID: 484 (code=killed, signal=SEGV)

Jan 22 15:36:35 home-server dhcpcd[484]: veth2c6abe3: waiting for carrier
Jan 22 15:36:35 home-server dhcpcd[484]: vethf713b46: IAID 69:de:ae:f1
Jan 22 15:36:35 home-server dhcpcd[484]: vethf713b46: adding address fe80::e7........7:52f9
Jan 22 15:36:35 home-server dhcpcd[484]: veth88ef6b4: waiting for carrier
Jan 22 15:36:35 home-server dhcpcd[484]: veth514e931: waiting for carrier
Jan 22 15:36:35 home-server dhcpcd[484]: route socket overflowed - learning interface state
Jan 22 15:36:35 home-server dhcpcd[484]: vethf32a0ec: carrier acquired
Jan 22 15:36:35 home-server dhcpcd[484]: vethf32a0ec: IAID bf:44:26:9c
Jan 22 15:36:35 home-server systemd[1]: dhcpcd.service: Main process exited, code=killed, status=11/SEGV
Jan 22 15:36:35 home-server systemd[1]: dhcpcd.service: Failed with result 'signal'.

I don't have enough knowledge about Linux to say that this is the right channel for this issue. Please be kind and redirect me if this issue is completely off topic.

To reproduce
I don't know. I can't find a pattern, it just happens now and then.

System

  • Which model of Raspberry Pi?
    Raspberry Pi 4

  • Which OS and version (cat /etc/rpi-issue)?

Raspberry Pi reference 2020-08-20
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 9a3a10bf1019ebb2d59053564dc6b90068bad27d, stage2
  • Which firmware version (vcgencmd version)?
Jan  7 2021 18:27:29
Copyright (c) 2012 Broadcom
version fb345a0c2d5544957f4ba1a2b9e968970e3312c4 (clean) (release) (start)
  • Which kernel version (uname -a)?
    Linux home-server 5.10.6-v7l+ #1393 SMP Mon Jan 11 15:09:41 GMT 2021 armv7l GNU/Linux

Additional context
I am only running docker containers on the Pi. I boot the OS from an SSD drive but this I did only recently and I had the issue before as well.

Dominant language
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