Bug #16814
open
High CPU after upgrade to 26.03-RELEASE
Added by Israel Fleischer 21 days ago.
Updated 11 days ago.
Affected Plus Version:
26.03
Affected Architecture:
1541
Description
I was running 25.07.1 and updated to 26.03 on 4-13-2026 06:15. Since updated CPU was spiking. Tracked it to pfblockerng, and specifically filterlog. Turning off pfblockerng normalizes CPU. Running it with larger blocklists logging off seemed to ease the CPU as well.
See attached images.
Files
I'm unable to reproduce this with GeoIP, so this must specifically be an issue with DNSBL, as suspected.
DNSBL is not enabled - so that cannot be the issue.
Kris,
In your tests do you have any blocklists loaded? We do have somewhat of a larger setup with multiple lists one which is quite large (~87k records). However DNSBL is not enabled (I checked this as part of my initial troubleshooting).
I will disable the larger list and see if that does anything but the CPU seemed to have been tied directly to pfblockerng filterlog.
Israel Fleischer wrote in #note-3:
Kris,
In your tests do you have any blocklists loaded? We do have somewhat of a larger setup with multiple lists one which is quite large (~87k records). However DNSBL is not enabled (I checked this as part of my initial troubleshooting).
I will disable the larger list and see if that does anything but the CPU seemed to have been tied directly to pfblockerng filterlog.
I have several large lists, but have no such high CPU usage. See attached.
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