You have been subscribed to a public bug:
On systems with more than 127 online CPUs, all interrupt vectors on i40e
driver are allocated to tx/rx queues and some features, like Flow
Director SideBand (FD_SB), are kept disabled.
Then, changing some features like TSO/GSO via ethtool will forcibly
enable FD_SB without any vectors available, and this way we get errors.
If we unload the i40e (using "modprobe -r") after these errors, we end
up crashing the system.
There is an upstream patch that address exactly this issue. We want to
request Canonical to merge it on Ubuntu 16.04.1 kernel if possible.
The patch is: a70e407f6d ("i40e: Fix errors resulted while turning off
Thanks in advance,
** Affects: linux (Ubuntu)
Assignee: Taco Screen team (taco-screen-team)
** Tags: architecture-ppc64le bugnameltc-146656 severity-high
i40e/setting some ethtool features and remove module right after (modprobe -r)
lead to crash in systems with more than 127 CPUs
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