On Tue, 27 Jan 2026 22:51:29 +0000 Aleksei Oladko wrote:
> This series addresses several issues in the networking kselftests
> that cause false-positive failures depending on the host environment,
> kernel configuration, or library versions.
>
> The main focus of these changes is to isolate tests from the host
> environment (using namespaces) and to ensure proper fallback or
> skipping when dependencies are missing.
>
> Summary of changes:
> 1. Adds a check for cls_basic module in fib_tests. Without this
> module, the test fails when attempting to add tc rules instead
> of skipping.
> 2. Fixes ovs-dpctl.py to return a non-zero exit code when pyroute2
> is too old. This allows pmtu.sh to correctly fall back to ovs-vsctl
> instead of assuming the configuration was successful.
> 3,4. Move reuseport and pmtu.sh tests info dedicated network namespaces.
> This prevents failures caused by port conflicts with host processes
> or interference from host firewall rules.
> 5. Ensures io_uring is enabled via sysctl before running io_uring_zerocopy
> test, preventing failures on systems where kernel.io_uring_disabled
> is set.
Something in this series breaks the pmtu test for us in the CI:
# 64.84 [+2.54] TEST: IPv6, bridged geneve6: PMTU exceptions - nexthop objects
[ OK ]
# 65.73 [+0.89] ovs_bridge not supported
# 65.73 [+0.00] TEST: IPv4, OVS vxlan4: PMTU exceptions
[SKIP]
# 67.20 [+1.47] ovs_bridge not supported
# 67.20 [+0.00] TEST: IPv6, OVS vxlan4: PMTU exceptions
[SKIP]
# 68.66 [+1.45] ovs_bridge not supported
# 68.66 [+0.00] TEST: IPv4, OVS vxlan6: PMTU exceptions
[SKIP]
# 70.11 [+1.45] ovs_bridge not supported
# 70.11 [+0.00] TEST: IPv6, OVS vxlan6: PMTU exceptions
[SKIP]
# 71.57 [+1.45] ovs_bridge not supported
# 71.57 [+0.00] TEST: IPv4, OVS geneve4: PMTU exceptions
[SKIP]
# 73.01 [+1.44] ovs_bridge not supported
# 73.01 [+0.00] TEST: IPv6, OVS geneve4: PMTU exceptions
[SKIP]
# 74.46 [+1.45] ovs_bridge not supported
# 74.46 [+0.00] TEST: IPv4, OVS geneve6: PMTU exceptions
[SKIP]
# 75.92 [+1.46] ovs_bridge not supported
# 75.93 [+0.00] TEST: IPv6, OVS geneve6: PMTU exceptions
[SKIP]
https://netdev-ctrl.bots.linux.dev/logs/vmksft/net/results/492641/137-pmtu-wrapper-sh/stdout
It was fine before:
https://netdev-ctrl.bots.linux.dev/logs/vmksft/net-dbg/results/492461/6-pmtu-sh/stdout
Since this is a bash test there are of course no logs to go by.. :/
I tried running
python tools/testing/selftests/net/openvswitch/ovs-dpctl.py add-dp br0
in a netns and that works just fine.
No idea what's going on..
