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As reported in bug 1512575 when the iptables-services package is upgraded it will do a full restart and recursively unload kernel modules. This causes a problem for other packages that may be using those modules or modules that depend upon them.
e.g.
nf_conntrack.ko used by openvswitch.ko
vport-geneve.ko used by openvswitch.ko
geneve.ko used by vport-geneve.ko
iptables-services restart will attempt to recursively unload nf_conntrack and therefore also openvswitch, vport-geneve, geneve. This will cause openvswitch tunnels to go down.
iptables-services stop/restart should _not_ be unloading nf_conntrack and related kernel modules.
The whole concept of unloading netfilter modules upon service restart seems futile to me. So far I heard two reasons for it being done:
1) Reset kernel state (esp. regarding conntrack).
2) Get conntrack out of fast path for increased performance.
Both aspects could be dealt with by either manually unloading modules (for users who know what they do) or a simple reload after disabling iptables (or configuring it into a stateless firewall).
Getting rid of module unloading altogether would also allow to drop previous workarounds for problems this caused (e.g. bug 1486803).
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2019:2218