Bug#1114938: patch available for vtk9 in bookworm (was Re: Bug#1114938: dune-grid: FTBFS in bookworm: Test #8: subsamplingvtktest ....................................***Failed)

[Markus Blatt]

Hi,

Am Fri, Sep 12, 2025 at 05:58:48PM +0200 schrieb Santiago Vila:
>On Fri, Sep 12, 2025 at 04:58:33PM +0200, Markus Blatt wrote:
>
>> This is bug 1064762 that has now probably been added to bookworm by a patch
>> to vtk9.
>>
>> I can work around this here by simply deactivating test, but this kind of
>> reading of the vtk files I cannot fix here. dune-grid just writes those
>> files.
>>
>> The underlying problem can only be fixed in VTK. though. It might affect
>> other packes.
>>
>> How should we proceed?
>
>I think it all depends on much effort we[*] are willing to make.
>
>At this point in the life of bookworm (which is 2/3 of its supported
>period), there are already at least 60 different ftbfs bugs, so I
>would say that fixing the FTBFS problem alone (disabling the offending
>tests, if that's your plan and you know how to do it) would be more
>than acceptable and a lot better than nothing.
>
>[*] I say "we" because I'm also a team member, but I certainly can't
>fix all the issues and I definitely appreciate any kind of QA work
>that others might offer (like fixing ftbfs bugs in bookworm).
>
>Thanks.
>

As the problem appears also when trying to view vtk files in paraview, I opted to fix this
in vtk. I did backport a fix that is already available in stable (to fix the same bug
1064762, see [1]) to bookworm. This fixes running the tests in dune-grid
and will prevent users of other packages experiencing problems when dealing with vtk files
containing raw data.

I am only a maintainer of dune-grid and cannot upload the fixed package myself. You will
find the fix in branch bookworm on salsa [2] (based on the latest bookworm release). I simply
cherry-picked the previous fix to bookworm.

For convenience the patch is also attached.

I am reassigning this to vtk

Best,

Markus

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1064762
[2] https://salsa.debian.org/science-team/vtk9/-/tree/bookworm?ref_type=heads
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