** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: New => Triaged
** Changed in: linux (Ubuntu)
Assignee: Taco Screen team (taco-screen-team) => Canonical Kernel Team
(canonical-kernel-team)
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https://bugs.launchpad.net/bugs/1626782
Title:
i40e/setting some ethtool features and remove module right after
(modprobe -r) lead to crash in systems with more than 127 CPUs
Status in linux package in Ubuntu:
Triaged
Bug description:
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
TSO")
[https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a70e407f6d0b0f63b17d468f78b666d33f264ba1]
Thanks in advance,
Guilherme
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