Oh, the board I have is also a 3B+, maybe that is the reason I can't
reproduce the issue.

the silkscreen on my board is:

Raspberry Pi 3 Model B+
@ Raspberry Pi 2017.

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https://bugs.launchpad.net/bugs/1861936

Title:
  Raspberry Pi 3 network dies shortly after a burst of IPv6 tunnel
  network load ((lan78xx): transmit queue 0 timed out)

Status in linux-raspi2 package in Ubuntu:
  Incomplete
Status in linux-raspi2 source package in Eoan:
  Won't Fix
Status in linux-raspi2 source package in Focal:
  Confirmed

Bug description:
  Desciption changed:
  Raspberry Pi 3 network partially dies (transmission doesn't work, reception 
still does) shortly after a burst of network load over IPv6, when IPv6 
connectivity is provided by a tunnel from tunnelbroker.net. The triggering load 
is typically an HTTP(S) download, and replication can be done without actually 
saving the file (wget -O /dev/null ...). Problem happens within downloading ~10 
GB, usually withinthe first 1 GB of traffic)
  Replication is 100% as long as _all_ of the following conditions are met 
  - 6in4 tunnel to HE.net set up with netplan
  - ipv6 rules applied (netfilter-persistent)
  - ipv6 forwarding enabled (edit /etc/sysctl.conf)

  
  kern.log message that appears after a while:

  Feb  4 23:42:59 rpi3 kernel: [  571.878359] ------------[ cut here 
]------------
  Feb  4 23:42:59 rpi3 kernel: [  571.878420] NETDEV WATCHDOG: eth0 (lan78xx): 
transmit queue 0 timed out
  Feb  4 23:42:59 rpi3 kernel: [  571.878550] WARNING: CPU: 3 PID: 0 at 
net/sched/sch_generic.c:447 dev_watchdog+0x324/0x330
  Feb  4 23:42:59 rpi3 kernel: [  571.878557] Modules linked in: sit tunnel4 
ip_tunnel bridge stp llc ip6table_filter ip6_tables xt_tcpudp xt_conntrack 
nf_conntrack iptable_filter bpfilter nls_ascii dm_multipath scsi_dh_rdac 
scsi_dh_emc scsi_dh_alua btsdio bluetooth ecdh_generic ecc brcmfmac brcmutil 
cfg80211 bcm2835_v4l2(CE) bcm2835_mmal_vchiq(CE) input_leds vc_sm_cma(CE) 
v4l2_common videobuf2_vmalloc spidev videobuf2_memops videobuf2_v4l2 
raspberrypi_hwmon videobuf2_common videodev mc uio_pdrv_genirq uio sch_fq_codel 
jool(OE) jool_common(OE) nf_defrag_ipv6 nf_defrag_ipv4 ip_tables x_tables 
autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy 
async_pq async_xor async_tx xor xor_neon raid6_pq libcrc32c raid1 raid0 
multipath linear hid_generic usbhid crct10dif_ce sdhci_iproc phy_generic fixed 
aes_neon_bs aes_neon_blk crypto_simd cryptd aes_arm64
  Feb  4 23:42:59 rpi3 kernel: [  571.878774] CPU: 3 PID: 0 Comm: swapper/3 
Tainted: G         C OE     5.3.0-1017-raspi2 #19-Ubuntu
  Feb  4 23:42:59 rpi3 kernel: [  571.878781] Hardware name: Raspberry Pi 3 
Model B Plus Rev 1.3 (DT)
  Feb  4 23:42:59 rpi3 kernel: [  571.878789] pstate: 60400005 (nZCv daif +PAN 
-UAO)
  Feb  4 23:42:59 rpi3 kernel: [  571.878800] pc : dev_watchdog+0x324/0x330
  Feb  4 23:42:59 rpi3 kernel: [  571.878807] lr : dev_watchdog+0x324/0x330
  Feb  4 23:42:59 rpi3 kernel: [  571.878812] sp : ffff00001001bd60
  Feb  4 23:42:59 rpi3 kernel: [  571.878817] x29: ffff00001001bd60 x28: 
0000000000000140
  Feb  4 23:42:59 rpi3 kernel: [  571.878827] x27: 00000000ffffffff x26: 
0000000000000000
  Feb  4 23:42:59 rpi3 kernel: [  571.878836] x25: ffff8ecbefa4e000 x24: 
ffff305e0f529018
  Feb  4 23:42:59 rpi3 kernel: [  571.878845] x23: 0000000000000000 x22: 
0000000000000001
  Feb  4 23:42:59 rpi3 kernel: [  571.878853] x21: ffff8ecbefa4e480 x20: 
ffff305e0f807000
  Feb  4 23:42:59 rpi3 kernel: [  571.878862] x19: 0000000000000000 x18: 
0000000000000000
  Feb  4 23:42:59 rpi3 kernel: [  571.878871] x17: ffff000010fd8218 x16: 
ffff305e0e30efb8
  Feb  4 23:42:59 rpi3 kernel: [  571.878879] x15: ffff8ecbf922a290 x14: 
ffffffffffffffff
  Feb  4 23:42:59 rpi3 kernel: [  571.878888] x13: 0000000000000000 x12: 
ffff305e0f944000
  Feb  4 23:42:59 rpi3 kernel: [  571.878897] x11: ffff305e0f82d000 x10: 
0000000000000000
  Feb  4 23:42:59 rpi3 kernel: [  571.878905] x9 : 0000000000000004 x8 : 
000000000000017f
  Feb  4 23:42:59 rpi3 kernel: [  571.878913] x7 : 0000000000000000 x6 : 
0000000000000001
  Feb  4 23:42:59 rpi3 kernel: [  571.878921] x5 : 0000000000000000 x4 : 
0000000000000008
  Feb  4 23:42:59 rpi3 kernel: [  571.878929] x3 : ffff305e0ee15750 x2 : 
0000000000000004
  Feb  4 23:42:59 rpi3 kernel: [  571.878937] x1 : 6abb42c67c954600 x0 : 
0000000000000000
  Feb  4 23:42:59 rpi3 kernel: [  571.878946] Call trace:
  Feb  4 23:42:59 rpi3 kernel: [  571.878955]  dev_watchdog+0x324/0x330
  Feb  4 23:42:59 rpi3 kernel: [  571.878967]  call_timer_fn+0x3c/0x178
  Feb  4 23:42:59 rpi3 kernel: [  571.878977]  __run_timers.part.0+0x200/0x330
  Feb  4 23:42:59 rpi3 kernel: [  571.878985]  run_timer_softirq+0x40/0x78
  Feb  4 23:42:59 rpi3 kernel: [  571.878995]  __do_softirq+0x168/0x384
  Feb  4 23:42:59 rpi3 kernel: [  571.879007]  irq_exit+0xb0/0xe8
  Feb  4 23:42:59 rpi3 kernel: [  571.879020]  __handle_domain_irq+0x70/0xc0
  Feb  4 23:42:59 rpi3 kernel: [  571.879028]  
bcm2836_arm_irqchip_handle_irq+0x74/0xe0
  Feb  4 23:42:59 rpi3 kernel: [  571.879037]  el1_irq+0x108/0x200
  Feb  4 23:42:59 rpi3 kernel: [  571.879050]  arch_cpu_idle+0x3c/0x1c8
  Feb  4 23:42:59 rpi3 kernel: [  571.879069]  default_idle_call+0x24/0x48
  Feb  4 23:42:59 rpi3 kernel: [  571.879081]  do_idle+0x210/0x2a0
  Feb  4 23:42:59 rpi3 kernel: [  571.879091]  cpu_startup_entry+0x28/0x30
  Feb  4 23:42:59 rpi3 kernel: [  571.879102]  
secondary_start_kernel+0x154/0x1c8
  Feb  4 23:42:59 rpi3 kernel: [  571.879108] ---[ end trace 349744d60a20e77a 
]---

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: linux-image-5.3.0-1017-raspi2 5.3.0-1017.19
  ProcVersionSignature: Ubuntu 5.3.0-1017.19-raspi2 5.3.13
  Uname: Linux 5.3.0-1017-raspi2 aarch64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: arm64
  Date: Tue Feb  4 23:49:19 2020
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-raspi2
  UpgradeStatus: No upgrade log present (probably fresh install)

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