Hi Frank,

Thanks for the update.

> > Did you try it on the original server which crashes frequently? Has it
> > made things more stable?
> 
> I tried on several of the affected servers. They are not more stable but
> suffer from different NFS related problems now.

> However, bug 1842037 is very clearly visible in the logs so I'm quite sure,
> I didn't miss it. I think the best solution for now is to park the ticket on
> your side and I'll provide feedback as soon as it happens again.

For Bug 1842037, how often would you normally see it happen? Would it
crash your server once a day, every few days, or very seldom? By being
clearly visible in the logs, did an oops appear in the logs each time
you had to reboot your server?

What happened when you installed the test kernel? Do you still see the
oops for bug 1842037 appear in the logs? Or is it not present at all
anymore, but you now suffer from bug 1828978 instead? If it was present
before, but it is no longer present with the test kernel, it might mean
the test kernel fixed bug 1842037.

> NFS is still unstable but the problem seems to be in GSSD now plus in
> Bug 1828978 . However, I can't tell you, if 1828978 happens in Xenial, only.

I had a look at Bug 1829878, and I have started building a kernel which
contains the commit you requested:

commit 068feb42581a81de45ec49618c554243c07c800e
Author: Trond Myklebust <trond.mykleb...@hammerspace.com>
Date:   Wed Jun 20 17:53:34 2018 -0400
Subject: NFSv4.1: Avoid false retries when RPC calls are interrupted

The test kernel will be available from the same ppa as the initial test
kernel, https://launchpad.net/~mruffell/+archive/ubuntu/sf241068-test in
a few hours time, once it has compiled.

The kernel which is currently building contains all three commits we
were talking about. The two commits for Bug 1842037, and the above
commit for Bug 1829878.

Note, for 1829878, the 4.18 HWE kernel is no longer supported, so any
fixes will be made available for the 5.0 HWE kernel.

I will write to you tomorrow with instructions on how to install the
test kernel, but if you are eager, they are the exact same as the
previous test kernel, as the kernel version has not changed, as I just
added the extra commit ontop of the last test kernel.

Let me know if you have any questions, and let me know if you still see
symptoms of bug 1842037 with the previous test kernel.

Thanks,
Matthew

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Title:
  Oops when Kerberos credentials are invalid

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