[15488] in athena10
Re: Debathena Fails to load AFS kernel modules
daemon@ATHENA.MIT.EDU (Benjamin Kaduk)
Wed Feb 28 16:44:41 2018
Date: Wed, 28 Feb 2018 15:44:19 -0600
From: Benjamin Kaduk <kaduk@mit.edu>
To: Anne Collin <acollin@mit.edu>
Cc: debathena <debathena@mit.edu>
Message-ID: <20180228214418.GL50954@kduck.kaduk.org>
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On Wed, Feb 28, 2018 at 10:15:47AM -0500, Anne Collin wrote:
> Hi Ben,
>
> Thanks a lot for tracking this down! I ended up reinstalling Ubuntu and Debathena from scratch and openAFS now works, but I wasn’t sure if I could upgrade to 16.04 as it didn’t seem to be supported by Debathena. So your answer is useful in that 1) now I know that I can and 2) I was afraid it would happen again.
It looks like the pieces for 16.04 are in place, but we haven't
quite updated the website/installer to know about that.
Glad you've got things working!
-Ben
> It’s true that it started getting messed up after upgrades that were suggested around the time of the « spectre » publicity.
>
> Best,
> Anne
>
> > Am 27.02.2018 um 21:16 schrieb Benjamin Kaduk <kaduk@mit.edu>:
> >
> > [re-adding debathena@mit.edu to the cc list]
> >
> > Hi Anne,
> >
> > Thanks for the data. It looks like you're running the Ubuntu
> > "hardware enablement" kernel with the 14.04.5 release, as opposed to
> > the older linux kernel series that shipped with the original 14.04
> > release. With some help from another developer, we spotted a
> > potential issue with this setup, in that the kernel you're running
> > is compiled using a compiler feature called "retpoline", that was
> > introduced as a partial mitgiation for the "spectre" vulnerabilities
> > that have been in the news recently. This changes the contract for
> > interactions between kernel modules such as the one from OpenAFS,
> > and the main kernel, so that the kernel module in question would
> > need to use the same compiler as the main kernel. Unfortunately,
> > the updated compiler does not appear to be readily available on your
> > system, and so (if our hypothesis is right), the mismatch would
> > prevent openafs from working.
> >
> > We could get one more data point to try to confirm if this is the
> > case, via:
> >
> > sudo dmesg | grep openafs
> >
> > In terms of possible workarounds, if you do not actually need the
> > "nardware enablement" kernel for the particular hardware in
> > question, you could try to downgrade to an older kernel; otherwise,
> > the simplest solution might be to upgrade the machine to a newer
> > Ubuntu release (e.g., 16.04 "Xenial", the source of the "hardware
> > enablement" kernel; the requisite compiler looks to be present on
> > Xenial systems).
> >
> > This is all pretty complicated and confusing, so please ask for
> > clarification as needed.
> >
> > -Ben
> >
> >> On Mon, Feb 26, 2018 at 04:07:46PM -0500, Anne Collin wrote:
> >> Sorry, the actual response to “lsb_release -a” is
> >>
> >> “No LSB modules are available.
> >> Distributor ID: Ubuntu
> >> Description: Ubuntu 14.04.5 LTS
> >> Release: 14.04
> >> Codename: trusty”
> >>
> >> Anne
> >>
> >>> On 26 Feb 2018, at 14:31, Anne Collin <acollin@mit.edu> wrote:
> >>>
> >>> Hi Ben,
> >>>
> >>> Thanks for the quick response, I'm attaching the screenshot of the terminal.
> >>>
> >>>
> >>> ________________________________________
> >>> De : Benjamin Kaduk [kaduk@mit.edu]
> >>> Envoyé : lundi 26 février 2018 13:53
> >>> À : Anne Collin
> >>> Cc : debathena
> >>> Objet : Re: Debathena Fails to load AFS kernel modules
> >>>
> >>> Hi Anne,
> >>>
> >>>> On Mon, Feb 26, 2018 at 01:50:03PM -0500, Anne Collin wrote:
> >>>> Hi,
> >>>>
> >>>> For some reason I am not able to access AFS MIT user accounts (not just mine, several MIT students’) on our lab Debathena machine (used to work fine until last week). I logged with the local admin account, and tried to troubleshoot with these instructions http://kb.mit.edu/confluence/display/istcontrib/Troubleshooting+Debathena+installation <https://master.mailbutler.io/redirect/90F34E00-60F7-403B-BBCB-CAD61795EB13>, but when I try to restart openafs-client, I get the error
> >>>> “Starting AFS services:modprobe: ERROR: could not insert ‘opens’: Exec format error
> >>>>
> >>>> Failed to load AFS kernel module, not starting AFS”
> >>>>
> >>>> Do you have any advice on what I should do? I’m even ready to reinstall Debathena, but I didn’t find any documentation online on how to do that.
> >>>
> >>> The OpenAFS packages used by Debathena are maintained as part of
> >>> Debian and Ubuntu, so in general issues seen with them may also be
> >>> present on non-Debathena machines. To help us understand what's
> >>> going on, could you provide the output of the following commands?
> >>>
> >>> uname -a
> >>>
> >>> lsb_release -a
> >>>
> >>> dpkg-query -W openafs-client
> >>>
> >>> Thanks,
> >>>
> >>> Ben
> >>> <Screenshot from 2018-02-26 14:30:25.png>
> >>
> >
> >
> >
