The sriov agent was polling devices via 'sudo ip link show',
and this resulted in a severe memory leak. The usage of 'sudo'
uses the host 'dbus-daemon', and somewhere the host does not
clean up login sessions.
Symptoms:
- gradual run out of memory until system unstable, host spontaneous
reboot due to delay or OOM
- huge growth of kernel slab
- thousands of /sys/fs/cgroup/systemd/user.slice/user-0.slice
session-x*.scope files with empty 'tasks', i.e., sessions
that should have deleted
- huge latency seen with ssh and various systemd commands
The problem is mitigated by disabling 'sudo' for sriov agent, using
a helm override that configures [agent]/root_helper='' .
Testing:
- Verified that we could launch a VM with SR-IOV interface;
VFs were able to set MAC and VLAN attributes.
Closes-Bug: 1815106
Change-Id: I0c57629c01b7407c99cc7f38b409019ab87af859
Signed-off-by: Jim Gauld <james.gauld@windriver.com>
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