Bug#795060: Latest Wheezy backport kernel prefers Infiniband mlx4_en over mlx4_ib, breaks existing installs
On Fri, 14 Aug 2015 13:01:03 +0200 Ben Hutchings wrote:
> On Fri, 2015-08-14 at 13:45 +0900, Christian Balzer wrote:
> [...]
> > So I decided to downgrade the Mellanox firmware of mbx09.
> >
> > After building a current version of mstflint (the one in Wheezy is
> > ancient and not particular justified) I got the oldest firmware
> > (2.32.5100) on the Supermicro FTP site for that mainboard and flashed
> > it.
> >
> > Lo and behold, no more vanishing acts of the ib0: interface, no more
> > need to blacklist/fake install the mlx4_en module.
> >
> > While moderately happy with the outcome, I still consider this a kernel
> > bug.
> > All the described behavior is not only very unexpected and unwelcome,
> > the fact that a remote card reboot can make your network stack vanish
> > (and not re-appear unless done manually) is just wrong.
> [...]
>
> This sounds rather more like a firmware bug than a kernel bug. Please
> ask Mellanox technical support about this. If they can identify a fix
> in the driver then I'll be happy to apply that.
>
Nevermind that a firmware bug in my book is something that affects things
locally, the fact that 3.2 is not affected and the items listed above make
it a kernel/upstream Mellanox bug.
I'd appreciate if you could use whatever means you have to kick this
upstream as well.
I'll send a mail to Mellanox support, which they may well ignore, this
being a Supermicro OEM product, never mind that it's 100% identical.
Regards,
Christian
--
Christian Balzer Network/Systems Engineer
chibi@gol.com Global OnLine Japan/Fusion Communications
http://www.gol.com/
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