pfSense

Attaching another crash with a potentially more interesting backtrace.

This continues to be simple to hit and quite annoying. Installs that worked fine for years all of a sudden can't run much beyond the base OS and remain stable.

A couple more. I have additional ones I haven't posted as well... Not sure how helpful they might be at this point since they all seem fairly random.

The attached configuration when loaded on a VM with 512MB of RAM can reproduce the panic reliably but with some variations in behavior. It leverages the OSPF6 bug to run the system out of RAM quickly. On some attempts ospf6d dies on its own (which is what should happen) but on other attempts it triggers a panic (no bueno).

Load the config on a fresh install and make sure FRR is installed and running (the config has it included). I would load the same config on a second unit as well so it will have at least one active OSPF6 neighbor. If you do that, make sure to adjust any system-specific parameters like the router ID in FRR OSPF6.

Once it's up and running:

• Navigate to Interfaces > WAN, click save and then click apply changes
• Wait about 20-30 seconds after applying.
• If it doesn't panic, check Status > Services and see if ospf6d is running. If not, restart it, then try again.

In most of my trials it panics on the second attempt. Occasionally I have to restart ospf6d after applying and then test again, resulting in it taking 3-4 attempts at most.

The process used to create the config was:

* Create VM with 512MB RAM
* Install pfSense Plus 21.05 RC (latest snap) or CE 2.6.0
* pfSsh.php playback enableallowallwan
* Enable SSH
* Update to current build (if available)
* Interfaces > Assignments, GIF tab, create a new GIF on WAN, doesn't need to work, just exist (e.g. WAN, 198.51.100.101, 10.103.111.1, 10.103.111.2, 30), save
* Interfaces > Assignments, assign the GIF, should be OPT1
* Interfaces > OPT1, Enable, Save/Apply
* Install FRR
* Services > FRR > OSPF6, Interfaces tab. Add WAN interface w/Area 0.0.0.0, save
* Services > FRR > OSPF6, Interfaces tab. Add LAN, save
* Services > FRR > OSPF6, Interfaces tab. Add OPT1, save
* OSPF6 tab, enable, set router ID to something sane, set Area to 0.0.0.0, save
* FRR Global/Zebra tab, enable, set a master password (e.g. "abc123"), save

Adding a few more I collected from a few misc installs during testing (some were deliberate crashes, others happened "naturally")

I've been aggressively attempting to crash the latest builds of 21.05 and 2.6.0 which include the fixes for this problem and thus far have had no success in triggering a panic. This is looking good to me. I could trigger it at-will a couple different ways before and now none of those methods lead to failures on any hardware or VM I try.

I'm willing to call this solved for the time being. If anything comes up I can reopen it.

Excluding from release notes since it was a problem introduced by changes after the last release.