Re: [Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Frank Burkhardt]

Hi Matthew,

- Ursprüngliche Mail -
> Von: "Bug 1842037" <1842...@bugs.launchpad.net>
> An: "burk" 
> Gesendet: Samstag, 19. Oktober 2019 09:56:12
> Betreff: [Bug 1842037] Re: Oops when Kerberos credentials are invalid

> Hi Frank,
> 
> It has been 9 days, or slightly over a week since you applied the respun
> test kernel to your systems.

It looks very promising. We had no more problems on the test systems.

> Are your systems stable now?

Yes, they are.

> Are they suffering any symptoms of Bug 1842037 or Bug 1828978?

No, they're not.

> Is the test kernel more stable than regular released Ubuntu kernels? Do
> you think the patches you requested fix the problems you were having?

I do think so. Please integrated the patches.

Thank you very much.

Best regards,

Frank

-- 
Frank Burkhardt 
IT Dept., Max Planck Institute for Human Cognitive
and Brain Sciences, Leipzig, Germany

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


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[Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Matthew Ruffell]

Hi Frank,

It has been 9 days, or slightly over a week since you applied the respun
test kernel to your systems.

Are your systems stable now? Are they suffering any symptoms of Bug
1842037 or Bug 1828978?

Is the test kernel more stable than regular released Ubuntu kernels? Do
you think the patches you requested fix the problems you were having?

Does the test kernel still crash when mis-behaving NFS clients connect?

Let me know how the respun test kernel is going. If things are good, I
can begin the process of getting the patches into an official Ubuntu
kernel. If things are not good, if you provide some logs of call traces
you are seeing, we can keep working on solving your problem.

Thanks,
Matthew

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


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Re: [Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Frank Burkhardt]

Hi,

- Ursprüngliche Mail -
> Von: "Bug 1842037" <1842...@bugs.launchpad.net>
> An: "burk" 
> Gesendet: Donnerstag, 3. Oktober 2019 01:22:16
> Betreff: [Bug 1842037] Re: Oops when Kerberos credentials are invalid

> Hi Frank,
> 
> I have tested the new test kernel and it boots successfully.
> 
> Please note this kernel is NOT SUPPORTED by Canonical, and is for
> TESTING PURPOSES ONLY. ONLY Install in a dedicated test environment.
> 
> Instructions to install (on a bionic system):
> 
> 1) sudo add-apt-repository ppa:mruffell/sf241068-test
> 2) sudo apt-get update
> 3) sudo apt install linux-image-unsigned-5.0.0-27-generic
> linux-headers-5.0.0-27-generic linux-headers-5.0.0-27
> linux-modules-5.0.0-27-generic linux-modules-extra-5.0.0-27-generic
> 4) reboot
> 5) uname -rv
> 5.0.0-27-generic #28~18.04.1+hf241068v20191002b1-Ubuntu SMP Wed Oct 2 04:04:05
> UTC
> 
> If you get different output from uname -rv, you might be booted into the
> wrong kernel, and you will need to change your grub configuration. Let
> me know if you need help with this.
> 
> Otherwise, this test kernel contains the requested patches for Bug
> 1842037 and Bug 1829878.

Thank you very much.

> Let me know how this test kernel goes, and if it fixes your NFS
> problems. If it doesn't, it would be good to upload some logs so we can
> have a better look.

I applied the test kernel to 3 of our production systems (since there's no
way to trigger either bug artificially). I know I shouldn't but I'm willing
to take the heat for problems arising from doing that.

I'll write you as soon as there's a hint of a problem on these machines.

Best,

Frank

-- 
Frank Burkhardt 
IT Dept., Max Planck Institute for Human Cognitive
and Brain Sciences, Leipzig, Germany

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


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[Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Matthew Ruffell]

Hi Frank,

I have tested the new test kernel and it boots successfully.

Please note this kernel is NOT SUPPORTED by Canonical, and is for
TESTING PURPOSES ONLY. ONLY Install in a dedicated test environment.

Instructions to install (on a bionic system):

1) sudo add-apt-repository ppa:mruffell/sf241068-test
2) sudo apt-get update
3) sudo apt install linux-image-unsigned-5.0.0-27-generic 
linux-headers-5.0.0-27-generic linux-headers-5.0.0-27 
linux-modules-5.0.0-27-generic linux-modules-extra-5.0.0-27-generic
4) reboot
5) uname -rv
5.0.0-27-generic #28~18.04.1+hf241068v20191002b1-Ubuntu SMP Wed Oct 2 04:04:05 
UTC

If you get different output from uname -rv, you might be booted into the
wrong kernel, and you will need to change your grub configuration. Let
me know if you need help with this.

Otherwise, this test kernel contains the requested patches for Bug
1842037 and Bug 1829878.

Let me know how this test kernel goes, and if it fixes your NFS
problems. If it doesn't, it would be good to upload some logs so we can
have a better look.

Thanks,
Matthew

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


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[Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Matthew Ruffell]

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 
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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


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Re: [Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Frank Burkhardt]

Hi Matthew,

- Ursprüngliche Mail -
> Von: "Bug 1842037" <1842...@bugs.launchpad.net>
> An: "burk" 
> Gesendet: Donnerstag, 26. September 2019 01:27:15
> Betreff: [Bug 1842037] Re: Oops when Kerberos credentials are invalid

> Hi Frank,
> 
> Just checking in to see how the test kernel is going. Does it fix your
> problem of the kernel crashing when users have invalid kerberos
> credentials?

I've not been able to reproduce the problem. The suggested method of
triggering it doesn't seem to work because:

   * If there's no kerberos identity (just a local user), the server
 won't let me enter the mounted folder.
   * If the local user is not known network wide but has a Kerberos
 identity and the remote idmapd cannot resolve it, it's mapped to
 nobody on the server.
   * No Oopps in both cases.

> 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.

> Did you have an opportunity to try the reproducer I linked you in my
> previous message?
> 
> Let me know how things are going, when you have had a chance to test the
> kernel.

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.
Both problems are triggered relatively seldom and only cause headaches because
they happen on very crowded computer servers. If in doubt, the admins here
try to get the servers running again ASAP which makes analysis very difficult.

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.

Thank you very much.

Best,

Frank

-- 
Frank Burkhardt 
IT Dept., Max Planck Institute for Human Cognitive
and Brain Sciences, Leipzig, Germany

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1842037/+subscriptions

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[Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Matthew Ruffell]

Hi Frank,

Just checking in to see how the test kernel is going. Does it fix your
problem of the kernel crashing when users have invalid kerberos
credentials?

Did you try it on the original server which crashes frequently? Has it
made things more stable?

Did you have an opportunity to try the reproducer I linked you in my
previous message?

Let me know how things are going, when you have had a chance to test the
kernel.

Thanks,
Matthew

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Matthew Ruffell]

Hi Frank,

Thanks for the update. Let me know how the test kernel goes when users
are on the system.

I looked into your stack trace and found the below link:

https://lore.kernel.org/lkml/20190529151003.hzmesyoiopnbc...@aura.draconx.ca/T/

I'm sure you have probably found it too when researching the bug, and
the commit needed to fix it. Can you try running the reproducer?

> OK, I think I found something that triggers this fault.  This happens
> when certain local users try to stat a file or directory on an nfs
> mount.  Presumably these UIDs do not have appropriate permissions on
> the server but I'm not sure exactly (I do not control the server).
>
> I can reproduce the oops with a command like this:
>
>   # su -s/bin/sh -c 'stat /path/to/nfs/file' problematic_user
>
> which oopes every time (and SIGKILLs the stat command).

Otherwise, let me know how the test kernel goes when opened up to users.

Thanks,
Matthew

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


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Re: [Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Frank Burkhardt]

Hi,

- Ursprüngliche Mail -
> Von: "Bug 1842037" <1842...@bugs.launchpad.net>
> An: "burk" 
> Gesendet: Mittwoch, 11. September 2019 02:44:11
> Betreff: [Bug 1842037] Re: Oops when Kerberos credentials are invalid

> Hi Frank,
> 
> The test kernel has built, and I have tested it to ensure it boots, but
> I now need you to verify that the backported patches fix the issue that
> you are having.

unfortunately, I have been unable to reproduce the problem in my test
environment until now. I attached the stack trace which I took when
opening the bug. I'll open the compute server with the patched kernel to some
test users now.

Best,

Frank

-- 
Frank Burkhardt 
IT Dept., Max Planck Institute for Human Cognitive
and Brain Sciences, Leipzig, Germany


** Attachment added: "bug-sunrpc.txt"
   
https://bugs.launchpad.net/bugs/1842037/+attachment/5288913/+files/bug-sunrpc.txt

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


To manage notifications about this bug go to:
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Re: [Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Frank Burkhardt]

Hi Matthey,

- Ursprüngliche Mail -
> Von: "Matthew Ruffell" <1842...@bugs.launchpad.net>
> An: "burk" 
> Gesendet: Mittwoch, 11. September 2019 02:44:11
> Betreff: [Bug 1842037] Re: Oops when Kerberos credentials are invalid

> Hi Frank,
> 
> The test kernel has built, and I have tested it to ensure it boots, but
> I now need you to verify that the backported patches fix the issue that
> you are having.
> 
> Can you please install the test kernel onto a system which is having
> problems with NFS clients that are connecting with invalid kerberos
> credentials?
> 
> Please note this kernel is NOT SUPPORTED by Canonical, and is for
> TESTING PURPOSES ONLY. ONLY Install in a dedicated test environment.

thank you for the quick response. I'm deploying the kernel to
a test system right now.

Best regards,

Frank

-- 
Frank Burkhardt 
IT Dept., Max Planck Institute for Human Cognitive
and Brain Sciences, Leipzig, Germany

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1842037] Re: Oops when Kerberos credentials are invalid

[Matthew Ruffell]

Hi Frank,

The test kernel has built, and I have tested it to ensure it boots, but
I now need you to verify that the backported patches fix the issue that
you are having.

Can you please install the test kernel onto a system which is having
problems with NFS clients that are connecting with invalid kerberos
credentials?

Please note this kernel is NOT SUPPORTED by Canonical, and is for
TESTING PURPOSES ONLY. ONLY Install in a dedicated test environment.

Instructions to install (on a bionic system):

1) sudo add-apt-repository ppa:mruffell/sf241068-test
2) sudo apt-get update
3) sudo apt install linux-image-unsigned-5.0.0-27-generic 
linux-headers-5.0.0-27-generic linux-headers-5.0.0-27 
linux-modules-5.0.0-27-generic linux-modules-extra-5.0.0-27-generic
4) reboot
5) uname -rv
5.0.0-27-generic #28~18.04.1+hf241068v20190910b2-Ubuntu SMP Tue Sep 10 06:53:53 
U

If you get output different from above then you need to edit grub
configuration to boot the correct kernel. If you are asked to abort the
kernel install due to removing the running kernel, say no.

This kernel contains the below patches you requested:

https://paste.ubuntu.com/p/BPD3PzmZ97/
https://paste.ubuntu.com/p/74n7nq5Wfj/

Please test the kernel and let me know if it fixes your problem. If you
could also provide a stack trace or sosreport of the original issue,
that would be good as well.

Let me know if you have any questions,

Thanks,
Matthew

** Also affects: linux (Ubuntu)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
   Status: New

** Also affects: linux-meta-hwe (Ubuntu Disco)
   Importance: Undecided
   Status: New

** Changed in: linux-meta-hwe (Ubuntu)
   Status: New => Invalid

** Changed in: linux-meta-hwe (Ubuntu Disco)
   Status: New => Invalid

** Changed in: linux (Ubuntu Disco)
   Status: New => In Progress

** Changed in: linux (Ubuntu Disco)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Disco)
 Assignee: (unassigned) => Matthew Ruffell (mruffell)

** No longer affects: linux-meta-hwe (Ubuntu)

** No longer affects: linux-meta-hwe (Ubuntu Disco)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1842037

Title:
  Oops when Kerberos credentials are invalid

Status in linux package in Ubuntu:
  New
Status in linux source package in Disco:
  In Progress

Bug description:
  There's a bug in Linux Kernel 5.0 which is triggered by invalid
  credentials when the NFS clients is trying to aquire them via GSSD.
  This affects NFS-Shares that are protected by krb5* security. They
  become unusable until the system is re-booted. The problem is quite
  severe on terminal servers with multiple users - some of them not
  caring about refreshing their kerberos tickets.

  A fix is available here:

  


To manage notifications about this bug go to:
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