Hello!
When using "vconfig rem" command to delete vlan device,
on which kernel-mode PPPoE session were active, vconfig
and all pppd processes froze in D state with all
networking operation stuck, rendering the box non-functional.
Kernel started to print message:
unregister_netdevice: waiting for vlan0154 to become free. Usage count = 3
in a loop until reboot.
This was kernel 2.6.18-rc7 on AMD64 box. It said 'Usage count = 3' and
there were exactly 3 pppd processes using vlan0154 interface and stuck
in D state.
~
:wq
With best regards,
Vladimir Savkin.
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