>From the comments I conclude that the following three patches from Linux
tree need to be picked:
cbb2fb5 net: set tb->fast_sk_family
7a56673 net: use inet6_rcv_saddr to compare sockets
fbed24b inet: fix improper empty comparison
Patches fix: 637bc8bbe6c0 ("inet: reset tb->fastreuseport when adding a
reuseport sk") which was added in 4.11.
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https://bugs.launchpad.net/bugs/1722702
Title:
libvirt - vnc port selection regression with newer kernels
Status in libvirt package in Ubuntu:
Won't Fix
Status in linux package in Ubuntu:
Confirmed
Bug description:
Bug appears in linux-image-4.11.x kernels on 16.04.3.
4.8.x and 4.10.x are okay.
When libvirtd is restarted on Kernel 4.11.0-x-generic or above , it
loses all information regarding existing port bindings and is unable
to correctly re-identify vnc ports that currently in use. libvirt
attempts to bind to an existing port and fails.
instance-000a6096.log:2017-10-09T01:42:16.017220Z
qemu-system-x86_64: -vnc 0.0.0.0:0: Failed to start VNC server: Failed to
listen on socket: Address already in use
Fairly certain this is the same bug reported, and patched in
kernel-4.13.4-200.fc26 for Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=1432684
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