Aspose.Slides Threw SkiaSharp Not Found Exception when Converting PPT to PDF

dsom · November 9, 2024, 6:36am

We are using Aspose.Total.NET.lic license. To convert PPTX to PDF on linux server we are using Aspose.Slides from Aspose repo instead of nuget as suggested here:

But we are getting below error intermittently and then server is also crashing:

Unhandled exception. System.TypeInitializationException: The type initializer for ‘SkiaSharp.SKObject’ threw an exception.
2024-11-09T06:14:05.639310761Z —> System.DllNotFoundException: Unable to load shared library ‘libSkiaSharp’ or one of its dependencies. In order to help diagnose loading problems, consider using a tool like strace. If you’re using glibc, consider setting the LD_DEBUG environment variable:
2024-11-09T06:14:05.639320062Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.10/libSkiaSharp.so: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639326162Z /App/libSkiaSharp.so: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639332363Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.10/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639338363Z /App/liblibSkiaSharp.so: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639344063Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.10/libSkiaSharp: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639349763Z /App/libSkiaSharp: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639355364Z /usr/share/dotnet/shared/Microsoft.NETCore.App/8.0.10/liblibSkiaSharp: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639361364Z /App/liblibSkiaSharp: cannot open shared object file: No such file or directory
2024-11-09T06:14:05.639381165Z
2024-11-09T06:14:05.639387665Z at SkiaSharp.SkiaApi.sk_version_get_milestone()
2024-11-09T06:14:05.639393465Z at SkiaSharp.SkiaSharpVersion.get_Native()
2024-11-09T06:14:05.639398866Z at SkiaSharp.SkiaSharpVersion.CheckNativeLibraryCompatible(Boolean throwIfIncompatible)
2024-11-09T06:14:05.639404466Z at SkiaSharp.SKObject…cctor()
2024-11-09T06:14:05.639410066Z — End of inner exception stack trace —
2024-11-09T06:14:05.639415466Z at SkiaSharp.SKObject.DeregisterHandle(IntPtr handle, SKObject instance)
2024-11-09T06:14:05.639421067Z at SkiaSharp.SKObject.set_Handle(IntPtr value)
2024-11-09T06:14:05.639426567Z at SkiaSharp.SKNativeObject.Dispose(Boolean disposing)
2024-11-09T06:14:05.639432167Z at SkiaSharp.SKObject.Dispose(Boolean disposing)
2024-11-09T06:14:05.639437567Z at SkiaSharp.SKBitmap.Dispose(Boolean disposing)
2024-11-09T06:14:05.639443068Z at SkiaSharp.SKNativeObject.Finalize()

andrey.potapov · November 9, 2024, 6:07pm

@dsom,
Thank you for reporting on the issue.

We are sorry that you have to encounter this problem. Could you please indicate the Linux version in which the error occurred?

dsom · November 11, 2024, 1:19pm

It is dotnet 8 runtime docker image:

mcr.microsoft.com/dotnet/aspnet:8.0

so it is Debian 12 (Bookworm) Linux distribution.

andrey.potapov · November 11, 2024, 2:23pm

@dsom,
Thank you for the details. I need some time to check the problem. I will get back to you soon.

andrey.potapov · November 12, 2024, 5:43am

@dsom,
Unfortunately, I was unable to reproduce the error you described. Could you please share the simplest project?

dsom · December 14, 2024, 3:43pm

Hi @andrey.potapov ,

Sorry, couldn’t share the sample application with you due to security reasons, because even if I removed the code logic I will have to provide the exact Docker file to replicate the issue.

However, we found a word document with which we were able to consistently replicate the issue. It was happening during extraction of data from the word document. This means the issue is not just with PPT to PDF conversion. Couldn’t share the word document as well due to security reasons.

But I found that other people are also facing similar issue of SkiaSharp dll not found in linux server:

github.com/mono/SkiaSharp

[BUG] SKiaSharp on linux can't find liblibSkiaSharp.so

opened 11:33AM - 19 Oct 23 UTC

aodpi

type/bug status/needs-attention

### Description I'm trying to use SkiaSharp on .net core 7.0 to validate an i…mage size. The app is running on a docker container on alpine linux. I've installed the package `SkiaSharp.NativeAssets.Linux` in my project. After building the libSkiaSharp.so is present in the folder `runtimtes/linux-musl-x64/native/` so it should work fine. But for some reason .net is try to load a file called `liblibSkiaSharp.so` in that folder. Is it a naming issue or something, where does the second `lib` word come from ? The version of SkiaSharp I'm using is: 2.88.6 ### Code The best way to share code for larger projects is a link to a GitHub repository: https://github.com/user/repo/tree/bug-123 But, you can also share a short block of code here: ```cs using var imageStream = file.OpenReadStream(); using var bitmap = SKBitmap.Decode(imageStream); if (bitmap == null) { return new ValidationResult("The image could not be decoded."); } var size = bitmap.Info.Size; if (size.Width > 512 || size.Height > 512) { return new ValidationResult("The image dimensions are too large."); } ``` ### Expected Behavior The image should be loaded successfully. ### Actual Behavior Trying to decode an image throws an exception ### Version of SkiaSharp Other (Please indicate in the description) ### Last Known Good Version of SkiaSharp Other (Please indicate in the description) ### IDE / Editor Visual Studio (Windows) ### Platform / Operating System Linux ### Platform / Operating System Version _No response_ ### Devices _No response_ ### Relevant Screenshots _No response_ ### Relevant Log Output ```shell Error loading shared library libSkiaSharp: No such file or directory Error loading shared library /app/runtimes/linux-musl-x64/native/liblibSkiaSharp: No such file or directory Error loading shared library /usr/share/dotnet/shared/Microsoft.NETCore.App/7.0.12/liblibSkiaSharp: No such file or directory Error loading shared library /app/liblibSkiaSharp: No such file or directory Error loading shared library liblibSkiaSharp: No such file or directory at SkiaSharp.SkiaApi.sk_managedstream_set_procs(SKManagedStreamDelegates procs) at SkiaSharp.SKAbstractManagedStream..cctor() --- End of inner exception stack trace --- at SkiaSharp.SKAbstractManagedStream..ctor(Boolean owns) at SkiaSharp.SKManagedStream..ctor(Stream managedStream, Boolean disposeManagedStream) at SkiaSharp.SKCodec.WrapManagedStream(Stream stream) at SkiaSharp.SKCodec.Create(Stream stream, SKCodecResult& result) at SkiaSharp.SKCodec.Create(Stream stream) at SkiaSharp.SKBitmap.Decode(Stream stream) ``` ### Code of Conduct - [X] I agree to follow this project's Code of Conduct

From the suggestions in the post adding SkiaSharp.NativeAssets.Linux.NoDependencies version 2.88.6 worked for now. Adding libfontconfig or SkiaSharp.NativeAssets.Linux package with latest version didn’t work. We are trying other scenarios.

andrey.potapov · December 14, 2024, 6:52pm

@dsom,
Thank you for the message. We would be very grateful if you could provide all the necessary information and files to reproduce the problem on our side and investigate the case.