linux-kernel - 5.10.17: unbound crash and network hangs

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Message-ID: <eb1f3694-c25b-0695-dcc4-0abb1bcb2dbb@gmx.de>
Date:   Sat, 20 Feb 2021 17:10:35 +0100
From:   Toralf Förster <toralf.foerster@....de>
To:     Linux Kernel <linux-kernel@...r.kernel.org>
Subject: 5.10.17: unbound crash and network hangs

The following coommand

	ip route add default dev enp4s0 src 5.9.158.75 table 10000

at a stable hardened Gentoo server

	Linux mr-fox 5.10.17 #18 SMP Wed Feb 17 12:59:16 CET 2021 x86_64
Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz GenuineIntel GNU/Linux

with 2 ip addresses immediately disconnects me from the server - no ping
nor anything else possible anymore. After a hard reset I have in the
kernel log:

...
Feb 20 16:59:31 mr-fox kernel: [ 9329.515488] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.515845] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.516156] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.516970] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.517010] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.518260] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.518297] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.518508] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.518726] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:31 mr-fox kernel: [ 9329.518825] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:36 mr-fox kernel: [ 9334.515626] net_ratelimit: 33954
callbacks suppressed
Feb 20 16:59:36 mr-fox kernel: [ 9334.515628] neighbour: arp_cache:
neighbor table overflow!
...
Feb 20 16:59:38 mr-fox kernel: [ 9336.381976] unbound[1994]: segfault at
0 ip 00005579fa70c87f sp 00007f21cd84e510 error 4 in
unbound[5579fa6b9000+aa000]
Feb 20 16:59:38 mr-fox kernel: [ 9336.381986] Code: 55 41 54 55 53 48 83
ec 78 64 48 8b 04 25 28 00 00 00 48 89 44 24 68 31 c0 48 8d 05 eb d7 0a
00 39 38 0f 82 90 00 00 00 89 fd <0f> b7 3a 49 89 f4 48 89 d3 41 89 cd
48 8d 72 04 66 83 ff 02 0f 84
Feb 20 16:59:41 mr-fox kernel: [ 9339.519436] net_ratelimit: 27500
callbacks suppressed
Feb 20 16:59:41 mr-fox kernel: [ 9339.519438] neighbour: arp_cache:
neighbor table overflow!
Feb 20 16:59:41 mr-fox kernel: [ 9339.519487] neighbour: arp_cache:
neighbor table overflow!


Any help appreciated l´kernel config is attached.
Thx.
--
Toralf

View attachment "config" of type "text/plain" (83999 bytes)