Looks like the issue is in the implementation of the netfilter hook
kernel module, as its not recommended to use GFP_KERNEL, and cannot
sleep in netfilter hooks, since the hookos  are run in interrupt context
(when the packet is received) by the net_rx_action softirq.  Instead
this issue is resolved using GFP_ATOMIC. I think this BUG can be closed.

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https://bugs.launchpad.net/bugs/1382340

Title:
  “BUG: scheduling while atomic: nc/3622/0x00000101”

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