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Bug 1722927

Summary: Nuage OVS crashes with Mellanox ConnectX-5 NICs and tcflower HW offload on OVS restart
Product: Red Hat OpenStack Reporter: Andreas Karis <akaris>
Component: openvswitchAssignee: Open vSwitch development team <ovs-team>
Status: CLOSED DUPLICATE QA Contact: Roee Agiman <ragiman>
Severity: unspecified Docs Contact:
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Version: 13.0 (Queens)CC: apevec, chrisw, rhos-maint
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Last Closed: 2019-06-21 18:04:52 UTC Type: Bug
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Description Andreas Karis 2019-06-21 17:59:05 UTC 
Description of problem:
Nuage OVS crashes with Mellanox ConnectX-5 NICs and tcflower HW offload on OVS restart

Additional info:

What problem/issue/behavior are you having trouble with?  What do you expect to see?

System should not crash, it should be possible to start/stop ovs without crashing the host

Where are you experiencing the behavior?  What environment?

this occurs when there is VXLAN traffic moving between VM using, the environment includes Mellanox ConnectX-5 NICs and OpenvSwitch with tc-flower support (Nuage Networks Virtualized Cloud Services 5.4.1u3)

When does the behavior occur? Frequently?  Repeatedly?   At certain times?

occurs regularly when restarting OVS with active flows/traffic
1. VF Switchdev with OVS offload enabled  (we believe this also occurs for virtio VMs as well)
2. Run overlay traffic. I don't believe it matters how many flows but I reproduced it with 32 flows 
3. systemctl restart openvswitch (Will not happen every time, I had to restart 4 times before the issue occurred. I waited for all 32 flows to be install in tc before restarting) 
4. The compute will crash and reboot
Comment 3 Andreas Karis 2019-06-21 18:04:52 UTC 

*** This bug has been marked as a duplicate of bug 1687045 ***