netdev - Re: [BISECTED] [4.17.0-rc6] IPv6 link-local address not getting added

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Message-ID: <8c197028-c043-c8ed-6734-7e9c0a2a6e06@gmail.com>
Date:   Wed, 27 Jun 2018 19:19:42 -0600
From:   David Ahern <dsahern@...il.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [BISECTED] [4.17.0-rc6] IPv6 link-local address not getting added

On 6/27/18 6:35 PM, Sowmini Varadhan wrote:
> 
> Hi David,
> 
> An IPv6 regression has been introduced in 4.17.0-rc6 by
>   8308f3f net/ipv6: Add support for specifying metric of connected routes
> 
> The regression is that some interfaces on my test machine come
> up with link-local addrs but the fe80 prefix is missing.
> After this bug, I cannot send any packets to anyone onlink 
> (including my routers). 
> 
> Here are the symptoms:
> 
> When everything is fine, "ip -6 route|grep eno" shows
> 
> 2606:b400:400:18c8::/64 dev eno1 proto ra metric 100  pref medium
> fe80::5:73ff:fea0:52d dev eno1 proto static metric 100  pref medium
> fe80::/64 dev eno1 proto kernel metric 256  pref medium
> fe80::/64 dev eno3 proto kernel metric 256  pref medium
> fe80::/64 dev eno4 proto kernel metric 256  pref medium
> default via fe80::5:73ff:fea0:52d dev eno1 proto static metric 100  pref medium
> 
> But after 8308f3f, I only find
> 
> # ip -6 route|grep eno
> 2606:b400:400:18c8::/64 dev eno1 proto ra metric 100  pref medium
> fe80::5:73ff:fea0:52d dev eno1 proto static metric 100  pref medium
> fe80::/64 dev eno1 proto kernel metric 256  pref medium
> default via fe80::5:73ff:fea0:52d dev eno1 proto static metric 100  pref medium
> 
> (note that eno2 is not enabled in my config, so its absence is expected)
> 
> Please have a look, thanks.
> --Sowmini
> 

interesting. I am not seeing that. Using your static LL routes:

# ip -6 ro ls
::1 dev lo proto kernel metric 256 pref medium
2001:db8:2::/120 dev eth2 proto kernel metric 256 pref medium
fe80::5:73ff:fea0:52d dev eth4 metric 100 pref medium
fe80::/64 dev eth4 proto kernel metric 256 pref medium
fe80::/64 dev eth5 proto kernel metric 256 pref medium
fe80::/64 dev eth6 proto kernel metric 256 pref medium
fe80::/64 dev eth7 proto kernel metric 256 pref medium
fe80::/64 dev eth8 proto kernel metric 256 pref medium
fe80::/64 dev eth2 proto kernel metric 256 pref medium
default via fe80::5:73ff:fea0:52d dev eth4 metric 100 pref medium

can you send me the network config files (off list is fine)? What's the
interface manager and any routing daemon in use?