25.11: Fatal trap 12 on reboot

w0w

@stephenw10
Uploaded primary_secondary.zip

stephenw10

Great I see that.

Were these VMs previously running 25.07.1 OK?

w0w

@stephenw10
Yep

stephenw10

Are you able to test using the debug kernel in 25.11?

https://docs.netgate.com/pfsense/en/latest/troubleshooting/debug-kernel.html

Those crashes are not very informative unfortunately. The output from the debug kernel should give us more.

w0w

@stephenw10
I’ve uploaded dumps from the primary firewall (primary.zip). I’ll check tomorrow whether the secondary firewall crashes as well.

stephenw10

Thanks.

That's interesting. It looks like a different bug to me. Those are almost identical backtraces in the IPv6 stack. We are looking at it....

w0w

@stephenw10
Uploaded secondary.zip, these look similar to me.
A bit off-topic.
Please note that both during system startup and when enabling CARP maintenance mode, there is a flood of CARP events. After the initial VIP reconfiguration at boot, it sometimes fails to complete (on the primary, almost consistently—likely due to higher latency). When PPPoE comes up, the configuration process starts over, even though PPPoE has no VIPs configured, and then it stops with nothing configured on LAN and I need to disable/enable CARP to make work it again. Is this the intended behavior? I understand this may be a separate issue and this is not related to 25.11, but it should be evident in the dumps.

stephenw10

Yup this new panic you;re seeing is specific to the debug kernel. We are fixing that so we will then be able to see the reboot issue.

w0w

@stephenw10
I am very grateful for your help and support!

stephenw10

No worries. I'm happy you're able to test an early dev snaphot. Finding these issues earlier makes it much easier for us.

stephenw10

Ok are you able to try a custom debug kernel here?

https://nc.netgate.com/nextcloud/s/Rj5F5K2qb4ps72R

If so rename the /boot/kernel folder to a backup then extract that .tgz into /boot and reboot into the new kernel.

w0w

@stephenw10 said in 25.11: Fatal trap 12 on reboot:

rename the /boot/kernel folder

You mean /boot/kernel.debug?

stephenw10

No I mean the kernel folder in boot. That tgz contains a complete replacement for that with the new debug kernel and all the modules for it.

stephenw10

So for example, assuming you uploaded the file via the GUI:

[25.11-DEVELOPMENT][admin@4860.stevew.lan]/root: mv /tmp/kernel_nd6_ifa_alloc.tgz /boot
[25.11-DEVELOPMENT][admin@4860.stevew.lan]/root: mv /boot/kernel /boot/kernel_old
[25.11-DEVELOPMENT][admin@4860.stevew.lan]/root: tar -xzf /boot/ker
[25.11-DEVELOPMENT][admin@4860.stevew.lan]/root: cd /boot
[25.11-DEVELOPMENT][admin@4860.stevew.lan]/boot: tar -xzf /boot/kernel_nd6_ifa_alloc.tgz

Then reboot and you should have:

[25.11-DEVELOPMENT][admin@4860.stevew.lan]/root: uname -a
FreeBSD 4860.stevew.lan 15.0-PRERELEASE FreeBSD 15.0-PRERELEASE #0 mjg-nd6-ifa_alloc-n256484-038e2217543a: Mon Sep 29 15:06:18 UTC 2025     root@pfsense-build-01.netgate.com:/usr/obj/usr/home/mjg/repos/FreeBSD-src/amd64.amd64/sys/pfSense-DEBUG amd64