strange error on Fclose()

Hdf-forum archives
1

Hi everyone,

I experience a strange error on Fclose().

My application simply opens a file, then opens some existing groups,
creates a number of groups, and finally closes all groups and the H5 file.
When I create a large number of groups (above 1000) I get this error:

H5Fsuper.c:1068: H5F_super_dirty: Assertion `f->shared->sblock' failed.

Seems like the f->shared->sblock does not have a right value.
Do you have any idea of what could cause this error?

Many thanks,
Dimos

2

Hi Dimos,

What version of HDF5 are you using? Are you using H5Pset_libver_bounds() to set a particular version of the file format (e.g.: H5F_LIBVER_LATEST)?

Can you reduce this to a small C program that demonstrates the problem?

Thanks,

Dana Robinson
Software Engineer
The HDF Group

···

From: Hdf-forum [mailto:hdf-forum-bounces@lists.hdfgroup.org] On Behalf Of Dimos Stamatakis
Sent: Wednesday, November 2, 2016 6:29 AM
To: hdf-forum@lists.hdfgroup.org
Subject: [Hdf-forum] strange error on Fclose()

Hi everyone,

I experience a strange error on Fclose().

My application simply opens a file, then opens some existing groups, creates a number of groups, and finally closes all groups and the H5 file.
When I create a large number of groups (above 1000) I get this error:

H5Fsuper.c:1068: H5F_super_dirty: Assertion `f->shared->sblock' failed.

Seems like the f->shared->sblock does not have a right value.
Do you have any idea of what could cause this error?

Many thanks,
Dimos

3

I just tested with hdf5-1.8.17 and there is no such error in the same
application! Seems like something is not right in the hdf5-vol (1.9.232).
Is there any support for the hdf5-vol, or it is not an active project?
Sorry about the individual posts, I did not get an email so that to reply
and post under the same topic.

Many thanks,
Dimos

4

Dimos,

VOL feature has not been released yet. The branch you are using is a prototype and it is not supported.

We just started a project (ends in 2019) to productize VOL and to include it in the maintenance releases of the HDF5 library. Currently, there is no release date for VOL. We will have a better idea by the end of 2017.

Thank you!

Elena

···

On Nov 2, 2016, at 6:57 PM, Dimos Stamatakis <dimstamat@gmail.com> wrote:

I just tested with hdf5-1.8.17 and there is no such error in the same application! Seems like something is not right in the hdf5-vol (1.9.232). Is there any support for the hdf5-vol, or it is not an active project?
Sorry about the individual posts, I did not get an email so that to reply and post under the same topic.

Many thanks,
Dimos
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5

Hi Dana,

thanks for your response! I am using the HDF5-VOL version 1.9.232 with no
specific library bounds. Does it have to do with the order I close the
groups? For example if I first close an outer group and then an inner group?
eg:
1) close /mygroup
2) close /mygroup/1

I will try to reproduce with a simple C program.

Thanks,
Dimos