Netscaler CPU 100% since last update

[Georg Paternoster]

Hello,

 

since last update our second Netscaler is on 100% CPU.

Is there any fix?

 

Release NS14.1 12.30.nc

 

Thanks!

[Jens Dellner]

Hi Georg,

there is no official fix at the moment. I have opened a case a few weeks ago (SR 82430732) and Citrix collected all required files. They can replicate this issue, so a fix should be available with the next firmware release in february. I don´t think that 14.1.12.35 will fix this problem. There is no hint within the release notes and it is an emergency release I found out that you can workaround this issue when you do a failover to the secondary node. The new primary (and old primary also) will have normal CPU utilization until reboot. But the high CPU utilization shouldn´t be a real problem, since the secondary will become primary in an outage of the primary appliance and the CPU utilization will fall down to normal utilization.

 

Best regards,

Jens

[Jens Dellner]

As suspected, 14.1.12.35 does not fix the problem. But there will also be no problems when installing the firmware if the CPU utilization of the secondary is high at the time.

[Davud Oeden]

Same problem here. Secondary Node has high CPU Utilization since upgrade to 14.1.12.35.

Hope there will be a fix in the next days.

[Jens Dellner]

Hi Davud,

14.1.12.35 replaces 14.1.12.30. It fixes the security vulnerabilities CVE-2023-6548 and CVE-2023-6549, but has no other greater bugfixes. This is why your secondary appliances will also have a high cpu utilization after you update from any other version to 14.1.12.35.

 

This issue is will be fixed in 14.1_27.x. They plan to release it in the second week of april. It´s a much longer time as usually for a new firmware release, but they want to do all sanity checks before it is released to public. The issue will be documented as NSHELP-37015 in the release notes. This information was provided by Citrix Support to us.

 

Best regards,

Jens

[Davud Oeden]

Hi Jens,

 

thanks for this informations. So we have to struggle with high CPU usage till second week of april ?

It's really a long time.

 

Thanks again,

Regards.