2.3 Lockup with no packages
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Want to report that I too have the same lock up issue, I have 3 Netgate SG-2440. Also seeing the same issue where interrupts goes really high. Based on when the devices lock up, I think it's dependent on the total number of packets that has gone through ipsec. Once it hits some limit, the system becomes unresponsive.
All three systems uses ipsec. Two of the systems uses ipsec a lot and locks up after about a week. One rarely uses ipsec and has only locked up once.