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I disabled IPv6 everywhere and that fixed the issue. I then re-enabled IPv6 and tried changing various settings. Turns out "Send rapid commit" was added and got enabled in both my LAN and WAN's DHCPv6 config and was running a script again and again and again until the system ran out of memory. Disabling this option and then rebooting fixed the issue.

It shouldn't get auto enabled and it shouldn't be running a script over and over.

I upgraded from the latest 25.7 version to 26.1 and within an hour my network went down. Sometimes I could get part of the OPNSense Web UI to load but nothing was functional. I went to check the console on the machine and saw that it was filled with an out of swap space error. My only option was to force reset the machine. Upon it rebooting I went into the Web UI and could see the memory usage rising in real-time. I ran the command

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ps -faxdvvv and got the output, which appears to be full of

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/usr/local/bin/php /usr/local/etc/rc.newwanipv6 igc0 SOLICIT
I have no idea what is going on but my machine keeps needing to be force reset every hour or so.
Pastebin of full output: https://pastebin.com/WBTCzXgr

I have had zero issues with OPNsense on this box for around 3 years now.