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There's a pppoe / IPv6 issue that is apparent on Zen UK network with a known mitigation.

When you say "there's a pppoe / IPv6 issue apparent on Zen UK" is this something that's been acknowledged elsewhere or are you speculating? I did try to search this forum before posting my original post on this, but all I could find was this: https://docs.opnsense.org/manual/how-tos/IPv6_ZenUK.html

While this certainly talks about how to set up IPv6 for Zen UK in the best way, it didn't directly acknowledge a problem, so I'm wondering what I missed.

Logs seems to be full of errors relating to various processes failing or being killed too. See extract from log here: pastebin

I saw a million configd exits too. Definitely the same issue, but what is the chicken and what is the egg I shan't say.

Hmm, sort of solved.

I noticed a LOT of /usr/local/bin/php /usr/local/etc/rc.newwanipv6 pppoe0 force in the activity (top) list.

I don't have an IPv6 address from my ISP (Zen UK) - one can be requested, but I never did.

Disabling IPv6 on the WAN interface completely (which I believe was auto-enabled on upgrading to 25.x - I certainly don't remember ever enabling it) removed all of these and the memory is no longer growing.

Logs seem full of these errors:
error in configd communication Traceback (most recent call last): File "/usr/local/sbin/configctl", line 65, in exec_config_cmd line = sock.recv(65536).decode() ^^^^^^^^^^^^^^^^ ConnectionResetError: [Errno 54] Connection reset by peer

Since 25.x I've had frequent errors in the WebGUI so it's clearly all pointing one place. Not sure what to do to resolve it, though, other than "fresh install", which I'd be loathe to do.

Since updating to 25.x I'm seeing very different memory utilisation behaviour. I only detected this after the router stopped routing traffic late last night. A reboot obviously brought this back down to normal levels, but it started creeping upwards again.

I've updated to 25.1.1 today, but not seeing a difference in the behaviour.

Rather than try to describe it, it's easier looking at this set of images: https://imgur.com/a/opn-25-x-memory-utilisation-pattern-strange-minFixB

I am wondering if unbound could be the culprit as it seems to have very high memory utilisation (see last image in the imgur post). I'm wondering if there's new cache behaviour in DNS lookups - i.e. the memory pattern grows as DNS requests are cached.

Am I the only one seeing this on the 25.x series?