I can reproduce on OS X, same version of HDF5. Compiling the library with 
--enable-debug and getting the trace (HDF5_DEBUG=“trace”) shows the following 
call:

H5Pset_filter(plist=167772178 (genprop list), filter=42, flags=0, cd_nelmts=2, 
cd_values=0x7fff50f2b10c {2, 2}) = SUCCEED;

So I bet it's a bug in h5repack.

Andrea


> On 22 Aug 2016, at 4:18 PM, Elvis Stansvik <[email protected]> 
> wrote:
> 
> 2016-08-22 10:16 GMT+02:00 Elvis Stansvik <[email protected]>:
> Consider the attached noop_plugin.c. It contains a dynamically loaded filter 
> plugin, with filter number 42, which does nothing except print out the 
> received `cd_values` array in the filter function.
> 
> Build the test plugin (on *NIX) with `make`.
> 
> Then test the following:
> 
> estan@newton:~/noop_plugin$ HDF5_PLUGIN_PATH=. h5repack -f UD=42,1,1 
> input.hdf5 output.hdf5
> 1 
> estan@newton:~/noop_plugin$ HDF5_PLUGIN_PATH=. h5repack -f UD=42,2,1,2 
> input.hdf5 output.hdf5
> 2 2
> estan@newton:~/noop_plugin$
> 
> Notice how in the second invokation (with UD=42,2,1,2), the cd_values 
> contains { 2, 2 }, despite { 1, 2 } being passed on the command line.
> 
> I forgot to say: This was with HDF5 1.8.16 on Ubuntu 16.04.
> 
> Elvis
>  
> 
> Has anyone seen this strangeness before, or can reproduce?
> 
> Thanks in advance,
> Elvis Stansvik
> 
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