Public bug reported:
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="anident...@adomain.com"
anonymous_identity="anonym...@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 :)
** Affects: ifenslave-2.6 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1326854
Title:
ambiguous error message "sh: echo: I/O error"
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