Description

After some time gnrc_border_router stops sending and answering by stdio (ethos). But I can ping this board from the another board.

I'm not sure but #16398 seems a bit similar

Steps to reproduce the issue

Prepare 2 boards: gnrc_border_router and gnrc_networking (just for "ping" utility)

Connect the BR to PC by ethos. Run from ethos folder:
$ sudo ./start_network.sh /dev/ttyUSB0 tap0 bbbb::/64

After just start ping the gnrc_networking node from linux console. By default 64-bytes ping packet will be sended with 1s delay and 1s timeout. For example:
$ ping bbbb::fc9e:48d0:a8de:14f5

Expected results

Ping packets should receive successfully infinite.

Actual results

After some packets, in my case from 1000 to 20000, linux console starts write:

64 bytes from bbbb::fc9e:48d0:a8de:14f5: icmp_seq=1741 ttl=63 time=123 ms
64 bytes from bbbb::fc9e:48d0:a8de:14f5: icmp_seq=1742 ttl=63 time=124 ms
64 bytes from bbbb::fc9e:48d0:a8de:14f5: icmp_seq=1743 ttl=63 time=125 ms
64 bytes from bbbb::fc9e:48d0:a8de:14f5: icmp_seq=1744 ttl=63 time=1142 ms
From fd00:dead:beef::1 icmp_seq=1793 Destination unreachable: Address unreachable
From fd00:dead:beef::1 icmp_seq=1794 Destination unreachable: Address unreachable
From fd00:dead:beef::1 icmp_seq=1795 Destination unreachable: Address unreachable
From fd00:dead:beef::1 icmp_seq=1796 Destination unreachable: Address unreachable
From fd00:dead:beef::1 icmp_seq=1797 Destination unreachable: Address unreachable

Ethos console:

uhcp_client(): no reply received
uhcp_client(): no reply received
uhcp_client(): no reply received
uhcp_client(): no reply received

Also ethos console doesn't answer on input messages at all.

But after long time (about 10 hours) BR starts works normally without reseting.
If BR board will be reseted, it starts works normally.

Boards

STM32WLE5CCU6 with LoRa (RAK3172 module) + 802.15.4 HAL driver (SubMAC)

Versions

Operating system: Ubuntu 22.04.1 on WSL2
RIOT OS master 11.05.2023