Once had this issue when back to PR1.1
n9 device into MALF coz dnsmasq failed to boot to much time.

after enable-rd-mode and set no-lifeguard-reset flag.
the device can boot.

and check the syslog, it shows failed to start up dnsmasq coz unknown interface lo. and actually interface lo is show as DOWN

and,as in the /etc/network/interfaces
lo entry seems right, huh ? I remember no need assign 127.0.0.1 address and netmask blabla, right ?
could someone show me your configure to verify ?

and, today, this bug appeared again on the PR1.2
still need find what failed to bring the interface lo

This issue disappear after reflash. but I am not supposed to do this flashing thing when this bug comes out again and again.
so, any help will be appreciated.

oh, another information.

this bug appear this time, I was somehow noticed.
when plugin the usb, my default action was SDK mode.

I notice the usb0 failed bring up, too.
then, after reboot the device. dnsmasq failed in production mode and device into MALF.

just got this problem
any solutions?

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edit: SOLVED

it's due to the package 'wireless-tools' (which was pulled in by an updated version of qnetman2) installed from the rzr-debian repository

the script '/etc/network/if-pre-up.d/wireless-tools' from this package caused this problem

removing 'wireless-tools' AND (manually) the script solved this

installing 'wireless-tools' from the official repository won't cause this problem