[Bug 1326854] Re: ambiguous error message "sh: echo: I/O error"

[Louis Bouchard]

As it turns out, this highlights a bug in the ifenslave script.

Starting with kernel 3.13 (commit
http://git.kernel.org/cgit/linux/kernel/git/stable/linux-
stable.git/commit/?id=5831d66e8097aedfa3bc35941cf265ada2352317),
/sys/class/net/{bond}/slave_{ifname} (notice the slave_) no longer
exist.

I am checking with a colleague to confirm but from what I can tell, it
has been replaced by  /sys/class/net/{bond}/lower_{ifname}.

If I am exact, I will bring up the bug to the author with a fix that
seems to work on my side.  Once that fix makes it into Wily, I will SRU
to Trusty.

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https://bugs.launchpad.net/bugs/1326854

Title:
  ambiguous error message "sh: echo: I/O error"

Status in ifenslave-2.6 package in Ubuntu:
  In Progress

Bug description:
  adding an interface to a bonding interface can result in the error
  message "sh: echo: I/O error" which is highly ambiguous (did the I/O
  error occur in sh, echo or is it an I/O error realted to the
  command/driver? - at least change this to "I/O error occured" which is
  still not helpful ("I/O occured in the kernel driver, please make sure
  it supports XY, check with <Z>" would be nice), but at least not
  confusing.

  reproduction:
  /etc/wpa_supplicant/wpa_supplicant.conf
  <code>
  network={
      ssid="assid"
      key_mgmt=WPA-EAP
      eap=TTLS
      proto=WPA RSN
      identity="anidentity at adomain.com"
      anonymous_identity="anonymous at adomain.de"
      ca_cert="/etc/wpa_supplicant/deutsche-telekom-root-ca-2.crt"
      phase2="auth=PAP"
  }
  </code>
  /etc/network/interfaces
  <code>
  iface main inet dhcp
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

  iface bond0 inet manual
      down ifenslave -d bond0 wlan0 wlan1
      bond-mode active-backup
      bond-miimon 100
      bond-slaves wlan0 wlan1

  allow-bond0 wlan0
  iface wlan0 inet manual
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      bond-master bond0

  allow-bond0 wlan1
  iface wlan1 inet manual
      wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
      bond-master bond0

  iface eth1 inet dhcp
  </code>
  my commands
  <code>
  sudo modprobe bonding
  sudo ifup wlan0
  sudo ifup wlan1
  sudo ifconfig bond0 # no DHCP example, so I've not idea how to get this running :( just providing a way to reproduce the error message (which should in no case be shown with its current content)
  sudo ifenslave bond0 wlan0 wlan1
  </code>

  I'm not requesting support here, just to fix the bug which should make
  the former unnecessary anyway :)

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