I'm running an AllStarLink 3 node on a Raspberry Pi 3B+.

**System:**

* Debian 13 (Trixie)
* ASL 3.9.3
* Asterisk 22.9.0
* DAHDI 3.4.0-11.asl.deb13

After running `apt update` and `apt upgrade`, the new Raspberry Pi kernel `6.18.34+rpt-rpi-v8` was installed, but the upgrade failed while rebuilding the DAHDI DKMS module.

The error reported by `apt` was:

```text
Building initial module dahdi/3.4.0 for 6.18.34+rpt-rpi-2712
The kernel is built without module signing facility, modules won't be signed

Building module(s).........(bad exit status: 2)

Error! Bad return status for module build on kernel:
6.18.34+rpt-rpi-2712 (aarch64)

Consult /var/lib/dkms/dahdi/3.4.0/build/make.log
```

The relevant compiler error from `make.log` is:

```text
dahdi-base.c:10135:9: error: implicit declaration of function 'del_timer_sync'
```

The node is still running normally because it has **not** been rebooted and is still running the previous kernel:

```text
$ uname -r
6.12.62+rpt-rpi-v8
```

Current package versions:

```text
Asterisk      : 22.9.0+asl3-3.9.3-1.deb13
ASL [app_rpt] : 3.9.3

dahdi-dkms    : 1:3.4.0-11.asl.deb13
dahdi-linux   : 1:3.4.0-11.asl.deb13
```

It appears that DAHDI 3.4.0 is not compatible with the Raspberry Pi 6.18 kernel because the kernel API changed (`del_timer_sync()` no longer exists).

Has anyone produced an updated DAHDI package or patch for the 6.18 Raspberry Pi kernel?

For now, my plan is simply to continue running on the current 6.12.62 kernel and avoid rebooting until a compatible DAHDI update is available.

**Note:** During my troubleshooting I also had an unrelated AllStarLink linking problem. That turned out to be an obsolete WAN interface on my Ubiquiti router causing IAX traffic to leave through the wrong public IP. Removing that interface completely resolved the linking issue, so it is unrelated to the DAHDI build failure.