netdev - RE: [Intel-wired-lan] NULL dereference on v4.1.x while enabling VF

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Date:	Mon, 2 May 2016 21:33:26 +0000
From:	"Skidmore, Donald C" <donald.c.skidmore@...el.com>
To:	William Dauchy <wdauchy@...il.com>,
	NETDEV <netdev@...r.kernel.org>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:	Alex Duyck <aduyck@...antis.com>
Subject: RE: [Intel-wired-lan] NULL dereference on v4.1.x while enabling VF



> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...ts.osuosl.org] On
> Behalf Of William Dauchy
> Sent: Monday, May 02, 2016 1:26 PM
> To: NETDEV <netdev@...r.kernel.org>; intel-wired-lan@...ts.osuosl.org
> Cc: Alex Duyck <aduyck@...antis.com>
> Subject: [Intel-wired-lan] NULL dereference on v4.1.x while enabling VF
> 
> Hello,
> 
> I am getting a NULL dereference on v4.1.x while enabling VF on a ixgbe (
> Intel Corporation 82599ES 10-Gigabit) card during boot.
> It seems to be related to a race since I don't have the issue if I test it a few
> seconds after boot. I had the same issue while testing on v4.5.x What can I
> do to help debug the issue?
> 
> ip link set dev eth0 up
> echo 32 > /sys/class/net/eth0/device/sriov_numvfs

Hey William,

Thanks for reporting the dereference.  Could you provide a little more detail on how you created this issue?  Are you just running the two commands (ip, sriov_numvfs) in some rc script and if you put a few second sleep in front of it you don't see the failure?

Thanks,
-Don Skidmore <donald.c.skidmore@...el.com>