Fw: [Bug 212749] New: ping over geneve over ipv6 would fail

Begin forwarded message:

Date: Thu, 22 Apr 2021 09:42:25 +0000
From: bugzilla-daemon@bugzilla.kernel.org
To: stephen@networkplumber.org
Subject: [Bug 212749] New: ping over geneve over ipv6 would fail


https://bugzilla.kernel.org/show_bug.cgi?id=212749

            Bug ID: 212749
           Summary: ping over geneve over ipv6 would fail
           Product: Networking
           Version: 2.5
    Kernel Version: 5.12.0-rc7
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
          Assignee: stephen@networkplumber.org
          Reporter: jishi@redhat.com
        Regression: No

ping over geneve over ipv6 would fail on 5.10.0-rc7 after commit 
Kernel repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
            Commit: 88a5af943985 - Merge tag 'net-5.12-rc8' of
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

reproducer:

ip netns add client                                                             
ip netns add server                                                             
ip link add veth0_c type veth peer name veth0_s                                 
ip link set veth0_c netns client                                                
ip link set veth0_s netns server                                                
ip netns exec client ip link set lo up                                          
ip netns exec client ip link set veth0_c up                                     
ip netns exec server ip link set lo up                                          
ip netns exec server ip link set veth0_s up                                     
ip netns exec client ip addr add 2000::1/64 dev veth0_c                         
ip netns exec client ip addr add 10.10.0.1/24 dev veth0_c                       
ip netns exec server ip addr add 2000::2/64 dev veth0_s                         
ip netns exec server ip addr add 10.10.0.2/24 dev veth0_s                       
ip netns exec client ping 10.10.0.2 -c 2                                        
ip netns exec client ping6 2000::2 -c 2                                         
ip netns exec client ip link add geneve1 type geneve vni 1234 remote 2000::2
ttl 64                   
ip netns exec server ip link add geneve1 type geneve vni 1234 remote 2000::1
ttl 64                   
ip netns exec client ip link set geneve1 up                                     
ip netns exec client ip addr add 1.1.1.1/24 dev geneve1                         
ip netns exec server ip link set geneve1 up                                     
ip netns exec server ip addr add 1.1.1.2/24 dev geneve1
ip netns exec client ping 1.1.1.2 -c 3

actual result:
+ ip netns exec client ping 1.1.1.2 -c 3                                        
PING 1.1.1.2 (1.1.1.2) 56(84) bytes of data.                                    
From 1.1.1.1 icmp_seq=1 Destination Host Unreachable                            
From 1.1.1.1 icmp_seq=2 Destination Host Unreachable                            
From 1.1.1.1 icmp_seq=3 Destination Host Unreachable                            

--- 1.1.1.2 ping statistics ---                                                 

3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2072ms

expected result:
ping should pass

BTW, ping over geneve over ipv4 would pass

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