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Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C

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Hey Salvatore.

On Sat, 2025-02-01 at 14:52 +0100, Salvatore Bonaccorso wrote:
> While looking at some NFS related bugs I noticed this one which was
> unaswered, but reported against an old 6.1.y version.

It still happens with 6.1.119-1.


> 6.1.y version, then please reopen the bug and do remove the moreinfo
> tag if you have an indepented reproducer of dCache, in which case it
> might be considered a upstream problem, otherwise I would suggest you
> first approach the dCache developers (it still could be a kernel
> problem as dCache from a quick look is plain in userpace
> components?).

I rather doubt it's a dCache bug, or well, at least it used to work in
older kernel versions as mentioned in the original report.
Also, as you say, dCache is purely in userspace.


> Please do attach the full boot log, after having triggered the
> problem.

There are no additional messages after the condition has been
triggered.
But I've attached the whole dmesg log.


> If you can, try please as well a more recent version ideally the one
> from unstable to verify the problem is still present there.

That's a bit difficult, as these are production nodes in use for WLCG,
I could only try doing so when we schedule the next downtime.


When I just retried I also noticed that after Ctrl-C-ing the hanging mv
it seems that dest file is kept, and the src file is gone (which I'd
consider as data loss, caused by this issue).


Cheers,
Chris.

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Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C Salvatore Bonaccorso <carnil@debian.org> - 2025-02-01 15:00 +0100
  Processed: Re: Bug#1049873: regression: linux-image-6.1.0-10-amd64:  NFS4.1/pNFS mv hangs, but finishes after Ctrl-C "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-02-01 15:00 +0100
  Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C Christoph Anton Mitterer <calestyo@scientia.org> - 2025-02-04 03:30 +0100
  Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C Christoph Anton Mitterer <calestyo@scientia.org> - 2025-02-04 03:30 +0100
    Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C Salvatore Bonaccorso <carnil@debian.org> - 2025-02-07 14:30 +0100
      Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C Christoph Anton Mitterer <calestyo@scientia.org> - 2025-02-10 20:50 +0100
        Bug#1049873: regression: linux-image-6.1.0-10-amd64: NFS4.1/pNFS mv hangs, but finishes after Ctrl-C Christoph Anton Mitterer <calestyo@scientia.org> - 2025-02-10 21:00 +0100

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