[Bug 1205185] [NEW] curl has apparently started attempting IPv6 even when it's not available

[Scott Kitterman]

Public bug reported:

eth0 was not connected.  The network connection was through wlan1 which,
as you can see, only has a link local IPv6 address.  IPv6 is disabled
for the connection in NetworkManager (and there's no IPv6 here anyway).
It doesn't affect anything (that I've noticed except curl (which affects
rmadison, when affects syncpackage, which is a pain).  This just started
recently, so it's some kind of regression.  Rmadison fails for both
Debian and Ubuntu, so I don't think it's something related to the server
on the distant end.

$ rmadison -u debian pyspf
curl: (7) Failed to connect to 2607:f8f0:610:4000:216:36ff:fe40:3860: Network is unreachable
kitterma at Scott-Latitude-E6320:~/devel/kde$ ifconfig
eth0      Link encap:Ethernet  HWaddr 5c:26:0a:48:2f:48  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:20 Memory:e2e00000-e2e20000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:38535 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38535 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:6149913 (6.1 MB)  TX bytes:6149913 (6.1 MB)

wlan1     Link encap:Ethernet  HWaddr 24:77:03:e6:33:08  
          inet addr:192.168.111.110  Bcast:192.168.111.255  Mask:255.255.255.0
          inet6 addr: fe80::2677:3ff:fee6:3308/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:606062 errors:0 dropped:0 overruns:0 frame:0
          TX packets:315570 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:699409894 (699.4 MB)  TX bytes:50265821 (50.2 MB)

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: curl 7.29.0-1ubuntu3.1
ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
Uname: Linux 3.8.0-26-generic i686
ApportVersion: 2.9.2-0ubuntu8.1
Architecture: i386
Date: Fri Jul 26 00:18:36 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2011-04-04 (843 days ago)
InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
MarkForUpload: True
SourcePackage: curl
UpgradeStatus: Upgraded to raring on 2013-04-24 (92 days ago)

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

** Affects: curl (Ubuntu Raring)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 raring regression-release

** Also affects: curl (Ubuntu Raring)
   Importance: Undecided
       Status: New

** Tags added: regression-release

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https://bugs.launchpad.net/bugs/1205185

Title:
  curl has apparently started attempting IPv6 even when it's not
  available

Status in “curl” package in Ubuntu:
  New
Status in “curl” source package in Raring:
  New

Bug description:
  eth0 was not connected.  The network connection was through wlan1
  which, as you can see, only has a link local IPv6 address.  IPv6 is
  disabled for the connection in NetworkManager (and there's no IPv6
  here anyway).  It doesn't affect anything (that I've noticed except
  curl (which affects rmadison, when affects syncpackage, which is a
  pain).  This just started recently, so it's some kind of regression.
  Rmadison fails for both Debian and Ubuntu, so I don't think it's
  something related to the server on the distant end.

  $ rmadison -u debian pyspf
  curl: (7) Failed to connect to 2607:f8f0:610:4000:216:36ff:fe40:3860: Network is unreachable
  kitterma at Scott-Latitude-E6320:~/devel/kde$ ifconfig
  eth0      Link encap:Ethernet  HWaddr 5c:26:0a:48:2f:48  
            UP BROADCAST MULTICAST  MTU:1500  Metric:1
            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
            Interrupt:20 Memory:e2e00000-e2e20000 

  lo        Link encap:Local Loopback  
            inet addr:127.0.0.1  Mask:255.0.0.0
            inet6 addr: ::1/128 Scope:Host
            UP LOOPBACK RUNNING  MTU:65536  Metric:1
            RX packets:38535 errors:0 dropped:0 overruns:0 frame:0
            TX packets:38535 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:0 
            RX bytes:6149913 (6.1 MB)  TX bytes:6149913 (6.1 MB)

  wlan1     Link encap:Ethernet  HWaddr 24:77:03:e6:33:08  
            inet addr:192.168.111.110  Bcast:192.168.111.255  Mask:255.255.255.0
            inet6 addr: fe80::2677:3ff:fee6:3308/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:606062 errors:0 dropped:0 overruns:0 frame:0
            TX packets:315570 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 txqueuelen:1000 
            RX bytes:699409894 (699.4 MB)  TX bytes:50265821 (50.2 MB)

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: curl 7.29.0-1ubuntu3.1
  ProcVersionSignature: Ubuntu 3.8.0-26.38-generic 3.8.13.2
  Uname: Linux 3.8.0-26-generic i686
  ApportVersion: 2.9.2-0ubuntu8.1
  Architecture: i386
  Date: Fri Jul 26 00:18:36 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2011-04-04 (843 days ago)
  InstallationMedia: Kubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
  MarkForUpload: True
  SourcePackage: curl
  UpgradeStatus: Upgraded to raring on 2013-04-24 (92 days ago)

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