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Bug#855632: Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file

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Hi

On Thu, Nov 30, 2017 at 03:35:40PM -0700, Stephen Dowdy wrote:
> On 11/30/2017 01:39 PM, Salvatore Bonaccorso wrote:
> > Is this worth trying to be fixed for the jessie kernel?
> 
> Salvatore,
> 
> I believe this is likely the reason for my bug report:
> 
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=855632
> 
> as that system has thrown EAGAIN errors since i installed it in April, 2015.
> It's a 10 NIC NFS server for the department, and often throws the error when i update files that are likely being read/open by client systems.
> (it doesn't have a huge resource consumption load ever and i get that failure)
> 
> So, i vote yeah ;)

Okay.

I tried to track that further down, and attached 

0001-locks-remove-i_have_this_lease-check-from-__break_le.patch
0002-locks-__break_lease-cleanup-in-preparation-of-allowi.patch

to be applied on top of the current jessie branch in git.

Attached are the two individual patches:

locks-remove-i_have_this_lease-check-from-__break_le.patch
locks-__break_lease-cleanup-in-preparation-of-allowi.patch

With these two patches applied I was not able to reproduce the problem
now for a while, whereas previously it was relatively fast
triggerable.

Can you confirm the issue would be addressed as well for you?
See the kernel-handbook for the simple-patching guideline:
https://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s4.2.2

Still since the patches were integrated in a bigger rewrite/touching
of fs/locks.c, fs/nfsd this might need a proper/deeper review if that
is complete and does not break anything.

Regards,
Salvatore

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Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file Salvatore Bonaccorso <carnil@debian.org> - 2017-11-30 21:50 +0100
  Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file Stephen Dowdy <sdowdy@ucar.edu> - 2017-11-30 23:40 +0100
    Bug#855632: Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file Salvatore Bonaccorso <carnil@debian.org> - 2017-12-04 21:30 +0100
      Bug#855632: Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file Salvatore Bonaccorso <carnil@debian.org> - 2017-12-14 21:00 +0100
        Bug#855632: Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file Stephen Dowdy <sdowdy@ucar.edu> - 2017-12-15 02:00 +0100
          Bug#855632: Bug#883217: linux: open on NFSv4 exported file on nfs server: "Resource temporarily unavailable" under reproducible conditions when client has granted read delegation on file Salvatore Bonaccorso <carnil@debian.org> - 2017-12-15 09:40 +0100

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