Test host process crashing from time to time, seems to be codec related

[amoerie]

Related issue in fo-dicom: fo-dicom/fo-dicom#1072

@jaime-olivares @cbeltran1306

I would love to get a little assistance with this problem, because it's hindering unrelated work (CI appears red while in fact there are no new bugs / issues ) and I'm a little on unknown terrain. Any way I could get you guys more output / detailed logging so this can be diagnosed?

In fact, the problem seems to be related to the codecs being called in parallel threads. Does this library not support multithreading? The README seems to suggest it doesn't:

@gofal Is this not a big problem? I think in our use cases this would be a very breaking change.

[amoerie]

Hi guys, can you provide any input here? @jaime-olivares @cbeltran1306
Do we know

• if parallel processing is not supported
• what would be needed to support it

If you need help with anything, we might be able to work something out.

[jaime-olivares]

Hi @amoerie
Indeed parallel is not supported yet.
We have approached a big company that may justify the project. Will have news soon.

[amoerie]

@jaime-olivares Thanks for getting back to me. Looking forward to more updates!

[cbeltran1306]

Hello @amoerie, could you provide us your test project to reproduce this ?

[amoerie]

Hi @cbeltran1306 thanks for circling back to this.

These tests have been disabled for a long time now because they sometimes crash the test host process:

https://github.com/fo-dicom/fo-dicom/blob/development/Tests/FO-DICOM.Tests/Bugs/GH549.cs

This is the error that (sometimes) occurred:

The active test run was aborted. Reason: Test host process crashed : Fatal error. Internal CLR error. (0x80131506)
The active Test Run was aborted because the host process exited unexpectedly while executing following test(s):
FellowOakDicom.Tests.Imaging.Codec.DicomCodecExtensionsTest.EncodeDecodeRLE16

Furthermore, this test also crashed the test host process sometimes:

https://github.com/fo-dicom/fo-dicom/blob/development/Tests/FO-DICOM.Tests/Imaging/Codec/DicomCodecExtensionsTest.cs#L106
(DicomCodecExtensionsTest.EncodeDecodeRLE16)

The active test run was aborted. Reason: Test host process crashed : Fatal error. Internal CLR error. (0x80131506)
The active Test Run was aborted because the host process exited unexpectedly while executing following test(s):
FellowOakDicom.Tests.Imaging.Codec.DicomCodecExtensionsTest.EncodeDecodeRLE16

Note that these tests sometimes succeeded without problems. But they were disabled because they sometimes fail, and if they fail, the bring down the whole process.