Public bug reported:

Binary package hint: iproute

ss command (kind of netstat from iproute package) fails when requested to 
display
udp sockets. I have blacklisted ipv6 module in /etc/modprobe.d.

Release:        8.04
iproute:
  Installed: 20071016-2ubuntu1
  Candidate: 20071016-2ubuntu1
  Version table:
 *** 20071016-2ubuntu1 0
        500 http://fi.archive.ubuntu.com hardy/main Packages
        100 /var/lib/dpkg/status

Example output:

$ ss -un
State      Recv-Q Send-Q                        Local Address:Port              
            Peer Address:Port 
ESTAB      0      0                            x.x.x.x:46860                    
       x.x.x.x:123   
ESTAB      0      0                            x.x.x.x:46869                    
     x.x.x.x:123   
ESTAB      0      0                            x.x.x.x:46646                    
      x.x.x.x:123   
ESTAB      0      0                            x.x.x.x:43324                    
    x.x.x.x:123   
ESTAB      0      0                            x.x.x.x:58233                    
     x.x.x.x:123   
Segmentation fault

See the attachment for strace listing. It segfaults after trying to open
/proc/net/upd6.

In Gutsy I remember using it without any problems.

** Affects: iproute (Ubuntu)
     Importance: Undecided
         Status: New

-- 
iproute: ss -u segfaults if ipv6 module is not loaded
https://bugs.launchpad.net/bugs/225573
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