RPi 4b lost all networking after update

[infernalbullfrog]

I recently (a couple of weeks ago) did a full system update of a Raspberry Pi 4b running aarch64. The system was working perfectly fine, and was connected to my network through the ethernet port, not using WiFi.

After the update, I discovered that the system has lost all network extensions.

[code]
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
$
[/code]

[code]
$ lspci
00:00.0 PCI bridge: Broadcom Inc. and subsidiaries BCM2711 PCIe Bridge (rev 20)
01:00.0 USB controller: VIA Technologies, Inc. VL805/806 xHCI USB 3.0 Controller (rev 01)
$
[/code]

No modules are loaded.. that seems odd.
[code]
$ lsmod
Module Size Used by
$
[/code]


/etc/systemd/network has both en.network and eth.network. There are no special udev rules. I'm at my wit's end with this.. any ideas?

[lategoodbye]

I think you already found the root cause, because there should be kernel modules loaded.

Could you please provide the following outputs:

uname -a

ls -l /lib/modules

[graysky]

Running RPi4B here too with linux-aarch64 up-to-date and have no such issues :/

[infernalbullfrog]

[code]
$ uname -a
Linux freydis 6.12.1-2-aarch64-ARCH #1 SMP PREEMPT_DYNAMIC Tue Dec 3 19:28:08 MST 2024 aarch64 GNU/Linux
$
[/code]

[code]
$ ls -l /lib/modules
drwxr-xr-x 2 root root 4096 Dec 16 02:01 6.11.6-2-aarch64-ARCH
drwxr-xr-x 3 root root 4096 Dec 16 02:02 6.12.1-2-aarch64-ARCH
$
[/code]

Looking into those two directories, I see that 6.11.6 has these modules:
[list]
* modules.alias
* modules.alias.bin
* modules.builtin.alias.bin
* modules.builtin.bin
* modules.dep
* modules.dep.bin
* modules.devname
* modules.softdep
* modules.symbols
* modules.symbols.bin
* modules.weakdep
[/list]

6.12.1 only has these:
[list]
* kernel <-- this is a directory
* modules.builtin
* modules.builtin.modinfo
* modules.order
[/list]

The kernel subdirectory appears to have a lot of sub-sub directories.

[infernalbullfrog]

With that clue, I tried re-installing the linux kernel, and that seems to have fixed the problem!

[code]
$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host noprefixroute
valid_lft forever preferred_lft forever
2: end0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether XX:XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff
altname enxxxxxxxxxxxxx
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
link/ether XX:XX:XX:XX:XX:XX brd ff:ff:ff:ff:ff:ff
altname wlxxxxxxxxxxxxx
$
[/code]