Hi Josiah
thank you for reporting,
it seems to be due to a card reset (on this card model, setting the promisc 
leads to a card reset),
it should be handled by avoiding handling promisc state changes when the card 
is in use, I will
check it. Please open an issue on github to keep track of it.

Alfredo

> On 27 Jul 2016, at 11:42, Josiah White <[email protected]> wrote:
> 
> Hello,
> 
> I am able to reproduce a kernel panic using the i40e-1.5.18-zc drivers.
> When I have a PF_RING application running using an interface (in this case 
> eth2)
> If I run tcpdump on this interface at the same time, then exit tcpdump it 
> will consistently cause a kernel panic. The logs indicate this happens when 
> tcpdump tries to leave promiscuous mode.
> From what I can see, the device resets when promiscuous mode is toggled which 
> causes PF_RING to raise an error since the device is in use.
> 
> This is the kernel log of when it had happened:
> http://hastebin.com/hibonigira.md <http://hastebin.com/hibonigira.md>
> 
> After this happens, the system hard-locks and requires physically rebooted.
> 
> Thanks
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> [email protected]
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