[15485] in athena10
Re: Debathena Fails to load AFS kernel modules
daemon@ATHENA.MIT.EDU (Anne Collin)
Wed Feb 28 10:16:18 2018
From: Anne Collin <acollin@mit.edu>
To: Benjamin J Kaduk <kaduk@mit.edu>
CC: debathena <debathena@mit.edu>
Date: Wed, 28 Feb 2018 15:15:47 +0000
Message-ID: <29DD5F90-79AA-461E-8D56-8597F83DF4A5@mit.edu>
In-Reply-To: <20180228021555.GH50954@kduck.kaduk.org>
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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’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>
>>
>
>
>
