Problem Description: Clearly explain the issue.

Call trace observed on client system (DUT with E810 ice card under test) when running topo tests.  It is unclear what is happening when the call traces start but could be related to IPv6 tunnel.  Additional details provided in comments.

Impact Assessment: Describe the severity and impact (e.g., network down,availability of a workaround, etc.).

 Software Versions: Specify the exact versions in use (e.g.,openvswitch3.1-3.1.0-147.el8fdp).

kernel: 6.12.0-114.el10.x86_64

openvswitch3.5-3.5.0-15.el10fdp.x86_64.rpm

  Issue Type: Indicate whether this is a new issue or a regression (if a regression, state the last known working version).

Possible regression; will need to run tests against RHEL-10.0.

 Reproducibility: Confirm if the issue can be reproduced consistently. If not, describe how often it occurs.

Unclear.  Additional test runs required.

 Reproduction Steps: Provide detailed steps or scripts to replicate the issue.

It is unclear at this time what causes the call trace as many different topo test scenarios are run during the test.

 Expected Behavior: Describe what should happen under normal circumstances.

No call trace.

 Observed Behavior: Explain what actually happens.

Call trace

 Troubleshooting Actions: Outline the steps taken to diagnose or resolve the issue so far.

 Logs: If you collected logs please provide them (e.g. sos report, /var/log/openvswitch/* , testpmd console)

sos report: 

http://kdump.usersys.redhat.com/vmcore/ovsqe/sosreport-001-r760-ee58u02-2025-08-04-gyjscoy.tar.xz

OVS logs: 

http://kdump.usersys.redhat.com/vmcore/ovsqe/001-r760-ee58u02_ovs_logs.tar.gz

/var/log/messages file: 

http://kdump.usersys.redhat.com/vmcore/ovsqe/001-r760-ee58u02_var_log_messages_2025-08-04_00:17:17

beaker job link: https://beaker.engineering.redhat.com/jobs/11486527