The customer's network recently experienced an outage, and found all the session end reason was resources-unavailable ;
I exec the comand " debug dataplane pool statistics" and found there is a parameter in the software pool called Regex Results that has been exhausted. Compared with normal firewalls, this value should not be reduced. I also tried to execute “set deviceconfig setting session resource-limit-behavior bypass” , but this solution is not acceptable to customers.
At present, the customer's system version is 9.1.13 of the PA3000 series, which has been rolled back to 9.1.12, and the parameters are normal
Does anyone know if this is a bug?
Customer needs an official explanation，thanks in advance！
Thank you for the post @miaocongcong
I experienced exactly the same issue in mid of February after I upgraded PA-3220 to 9.1.13. The command you executed: "debug dataplane pool statistics" is the right way to drill down the issue. As an immediate measure we failed over the Firewall and rebooted the one that was having an issue and opened a TAC case. After spending some time on the call, TAC advised to downgrade the Firewall that solved the issue, however we could not get anything official regarding bug. Based on the input from TAC, in version 9.1.13 there were some issues that engineering team is looking into, but there is no official bug id for this.
Today, PAN-OS 9.1.14 was released. This issue was addressed in this release: PAN-189468
Thank you for feedback and sorry to hear that @bvandi
to be honest, there is not much I can add to this. Myself, I am no longer facing this issue and can't comment on this anymore. At this point I would open a ticket to TAC to address this issue.
After upgrading PAN-OS to 9.1.13 or 10.0.10, unexpected traffic failure may occurs and traffic log shows the session end reason "resources-unavailable".
If you can see the session end reason "resources-unavailable" under traffic log without resource usage spike after upgrading PAN-OS to affected versions, please check whether the counter "aho_alloc_lookup_failed" is increasing or not.
> show counter global name aho_alloc_lookup_failed Name: aho_alloc_lookup_failed Value: 184328 <<<<<<---------------!!!!!! Severity: Warning Category: aho Aspect: resource Description: failed to alloc regex lookup
If you can see the above counter is increasing, please also check whether the "Regex Results" is depleted.
> debug dataplane pool statistics | match "Regex Results"  Regex Results (13272): 15/8192 0x8000000109219180
If your firewall matches to the above symptoms, the issue might be hitting to PAN-189468.
Please open a new support case via CSP with uploading tech-support file, if you need our assistance for checking the condition.
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