Blender crash when showing thumbnail of a strongly skewed .exr image #89868

System Information
Operating system: Linux-5.8.0-59-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.80

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-14 22:15, hash: 4e65b1ef6c
Worked: Unknown

Short description of error
Thumbnail of strongly skewed (aspect ratio > 32) .exr image crashes blender
Blender segfaults with the error: "OpenColorIO Error: PackedImageDesc Error: Invalid image dimensions."

Exact steps for others to reproduce the error

Open an Image Editor.
Create a new image with aspect ratio greater than 32 (eg. 2048 x 32)
Save image as .exr
Click on a Image Browser near the image name, where thumbnails usually appear.

or

open crash.exr in image editor
Click on image browser

Note: the bug is not present for other file formats

blender_debug_output.txt

blender.crash.txt

{F10226406, width=100%}

**System Information** Operating system: Linux-5.8.0-59-generic-x86_64-with-glibc2.31 64 Bits Graphics card: GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.80 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-07-14 22:15, hash: `4e65b1ef6c` Worked: Unknown **Short description of error** Thumbnail of strongly skewed (aspect ratio > 32) .exr image crashes blender Blender segfaults with the error: "OpenColorIO Error: PackedImageDesc Error: Invalid image dimensions." **Exact steps for others to reproduce the error** - Open an Image Editor. - Create a new image with aspect ratio greater than 32 (eg. 2048 x 32) - Save image as .exr - Click on a Image Browser near the image name, where thumbnails usually appear. or - open `crash.exr` in image editor - Click on image browser Note: the bug is not present for other file formats ![crash.exr](https://archive.blender.org/developer/F10224832/crash.exr) [blender_debug_output.txt](https://archive.blender.org/developer/F10224889/blender_debug_output.txt) [blender.crash.txt](https://archive.blender.org/developer/F10224887/blender.crash.txt) {[F10226406](https://archive.blender.org/developer/F10226406/T89868.gif), width=100%}

Added subscriber: @blendersamsonov

Added subscriber: @deadpin

Changed status from 'Needs Triage' to: 'Needs User Info'

Please attach the offending .exr image to this report. I attempted to reproduce the problem unsuccessfully using Blender's own image editor and creating an 80x2, 40x1, 2x80, and 1x40 OpenEXR image. Thumbnails and full image loading seem to work fine.

The 1x40 image did show a particular form of thumbnail problem, which has already been filed, but we need to take a look at your particular file here to know if it is different or a duplicate of the other issue. At least provide more information like the exact dimensions used and what program you used to create the .exr file.

Please attach the offending .exr image to this report. I attempted to reproduce the problem unsuccessfully using Blender's own image editor and creating an 80x2, 40x1, 2x80, and 1x40 OpenEXR image. Thumbnails and full image loading seem to work fine. The 1x40 image did show a particular form of thumbnail problem, which has already been filed, but we need to take a look at your particular file here to know if it is different or a duplicate of the other issue. At least provide more information like the exact dimensions used and what program you used to create the .exr file.

This image for example crashes blender in my case. It's an empty 1x64 image.

Again, this was created by blender itself and just saved as .exr image

This image for example crashes blender in my case. It's an empty 1x64 image. ![crash.exr](https://archive.blender.org/developer/F10224832/crash.exr) Again, this was created by blender itself and just saved as .exr image

This is most likely a duplicate of #70356 as the scaling routine has issues when any of the dimensions are 1. There's a patch associated with that bug that still needs to be reviewed that should fix the issue.

Closed as duplicate of #70356

Well, I wouldn't think this to be a duplicate, as large images crash blender too. Like this one (4096 x 64)

Well, I wouldn't think this to be a duplicate, as large images crash blender too. Like this one (4096 x 64) ![crash.exr](https://archive.blender.org/developer/F10224852/crash.exr)

Changed status from 'Duplicate' to: 'Needs Triage'

Resetting, but I'm not able to reproduce a crash on either Windows 10 or a Linux desktop using a recent build. I'll have to leave this for other folks to look at until I can investigate further.

Added subscriber: @PratikPB2123

I can confirm on windows with 2.93 and above (seems fine with 2.92 on first check)

blender.crash.txt

blender_debug_output.txt

System Information

Graphics card : AMD Radeon(TM) 535 ATI Technologies .```

I can confirm on windows with 2.93 and above (seems fine with 2.92 on first check) [blender.crash.txt](https://archive.blender.org/developer/F10224887/blender.crash.txt) [blender_debug_output.txt](https://archive.blender.org/developer/F10224889/blender_debug_output.txt) --- **System Information** ```Operating system : Windows-10-10.0.18362-SP0 64 Bits Graphics card : AMD Radeon(TM) 535 ATI Technologies .```

Changed status from 'Needs Triage' to: 'Confirmed'

Added subscriber: @EAW

In #89868#1191475, @PratikPB2123 wrote:
I can confirm on windows with 2.93 and above (seems fine with 2.92 on first check)

Makes sense, as the stack trace points to OpenColorIO_v2_0::PackedImageDesc::getNumChannels and OCIO_v2 was added for 2.93.

> In #89868#1191475, @PratikPB2123 wrote: > I can confirm on windows with 2.93 and above (seems fine with 2.92 on first check) Makes sense, as the stack trace points to `OpenColorIO_v2_0::PackedImageDesc::getNumChannels` and OCIO_v2 was added for 2.93.

Added subscriber: @ideasman42

In #89868#1191440, @blendersamsonov wrote:
Well, I wouldn't think this to be a duplicate, as large images crash blender too. Like this one (4096 x 64)

I can't redo the crash with the larger image, however resizing smaller images as been fixed 38131cc5e5.

Can you check if the 1px images in this report are now working?

> In #89868#1191440, @blendersamsonov wrote: > Well, I wouldn't think this to be a duplicate, as large images crash blender too. Like this one (4096 x 64) > ![crash.exr](https://archive.blender.org/developer/F10224852/crash.exr) I can't redo the crash with the larger image, however resizing smaller images as been fixed 38131cc5e5. Can you check if the 1px images in this report are now working?

Hi @ideasman42 , can still recreate the crash (broken version: 118803893e)

Ok, I will add a short video to describe the steps :)

Hi @ideasman42 , can still recreate the crash (broken version: 118803893e) Ok, I will add a short video to describe the steps :)

I have also just found out that 16-bit .png image also causes a crash. So the problem might be actually related to the bit depth of the image

Ah, now I can repro as well, thanks for the video - I was viewing thumbnails elsewhere. The issue is that we're feeding a 32x0 (obviously wrong) buffer to OpenColorIO

icon_copy_rect does the following which truncates down to 0 for the tiny y dimension in this case:
ey = (short)scaledy;

 	blender.exe!OCIO_reportError(const char * err) Line 61	C++
 	blender.exe!OCIO_reportException(OpenColorIO_v2_0::Exception & exception) Line 66	C++
 	blender.exe!`OCIOImpl::createOCIO_PackedImageDesc'::`1'::catch$0() Line 766	C++
 	[External Code]	
 	blender.exe!OCIOImpl::createOCIO_PackedImageDesc(float * data, long width, long height, long numChannels, long chanStrideBytes, long xStrideBytes, long yStrideBytes) Line 754	C++
 	blender.exe!OCIO_createOCIO_PackedImageDesc(float * data, long width, long height, long numChannels, long chanStrideBytes, long xStrideBytes, long yStrideBytes) Line 274	C++
 	blender.exe!IMB_colormanagement_processor_apply(ColormanageProcessor * cm_processor, float * buffer, int width, int height, int channels, bool predivide) Line 3890	C
 	blender.exe!colormanagement_transform_ex(unsigned char * byte_buffer, float * float_buffer, int width, int height, int channels, const unsigned char * from_colorspace, const unsigned char * to_colorspace, bool predivide, bool do_threaded) Line 1968	C
 	blender.exe!IMB_colormanagement_transform(float * buffer, int width, int height, int channels, const unsigned char * from_colorspace, const unsigned char * to_colorspace, bool predivide) Line 1982	C
 	blender.exe!IMB_rect_from_float(ImBuf * ibuf) Line 756	C
>	blender.exe!icon_copy_rect(ImBuf * ibuf, unsigned int w, unsigned int h, unsigned int * rect) Line 1324	C

 	blender.exe!icon_preview_startjob(void * customdata, short * stop, short * do_update) Line 1406	C
 	blender.exe!common_preview_startjob(void * customdata, short * stop, short * do_update, float * UNUSED_progress) Line 1456	C
 	blender.exe!other_id_types_preview_render(IconPreview * ip, IconPreviewSize * cur_size, const int pr_method, short * stop, short * do_update, float * progress) Line 1508	C
 	blender.exe!icon_preview_startjob_all_sizes(void * customdata, short * stop, short * do_update, float * progress) Line 1585	C

Ah, now I can repro as well, thanks for the video - I was viewing thumbnails elsewhere. The issue is that we're feeding a 32x0 (obviously wrong) buffer to OpenColorIO `icon_copy_rect` does the following which truncates down to 0 for the tiny y dimension in this case: ` ey = (short)scaledy;` ``` blender.exe!OCIO_reportError(const char * err) Line 61 C++ blender.exe!OCIO_reportException(OpenColorIO_v2_0::Exception & exception) Line 66 C++ blender.exe!`OCIOImpl::createOCIO_PackedImageDesc'::`1'::catch$0() Line 766 C++ [External Code] blender.exe!OCIOImpl::createOCIO_PackedImageDesc(float * data, long width, long height, long numChannels, long chanStrideBytes, long xStrideBytes, long yStrideBytes) Line 754 C++ blender.exe!OCIO_createOCIO_PackedImageDesc(float * data, long width, long height, long numChannels, long chanStrideBytes, long xStrideBytes, long yStrideBytes) Line 274 C++ blender.exe!IMB_colormanagement_processor_apply(ColormanageProcessor * cm_processor, float * buffer, int width, int height, int channels, bool predivide) Line 3890 C blender.exe!colormanagement_transform_ex(unsigned char * byte_buffer, float * float_buffer, int width, int height, int channels, const unsigned char * from_colorspace, const unsigned char * to_colorspace, bool predivide, bool do_threaded) Line 1968 C blender.exe!IMB_colormanagement_transform(float * buffer, int width, int height, int channels, const unsigned char * from_colorspace, const unsigned char * to_colorspace, bool predivide) Line 1982 C blender.exe!IMB_rect_from_float(ImBuf * ibuf) Line 756 C > blender.exe!icon_copy_rect(ImBuf * ibuf, unsigned int w, unsigned int h, unsigned int * rect) Line 1324 C blender.exe!icon_preview_startjob(void * customdata, short * stop, short * do_update) Line 1406 C blender.exe!common_preview_startjob(void * customdata, short * stop, short * do_update, float * UNUSED_progress) Line 1456 C blender.exe!other_id_types_preview_render(IconPreview * ip, IconPreviewSize * cur_size, const int pr_method, short * stop, short * do_update, float * progress) Line 1508 C blender.exe!icon_preview_startjob_all_sizes(void * customdata, short * stop, short * do_update, float * progress) Line 1585 C ```

Added subscriber: @Harley

@deadpin - The issue is that we're feeding a 32x0 (obviously wrong) buffer to OpenColorIO

I can see that happening with very small images, but not sure how that could happen with OP’s examples. Image of 2048 x 32 would make a thumbnail of 256x4, and so 2047x32 might get truncated to 256x3.

> @deadpin - The issue is that we're feeding a 32x0 (obviously wrong) buffer to OpenColorIO I can see that happening with very small images, but not sure how that could happen with OP’s examples. Image of 2048 x 32 would make a thumbnail of 256x4, and so 2047x32 might get truncated to 256x3.

This issue was referenced by 0de54a9cfe

This issue was referenced by 0de54a9cfea5a981bfa9fa6ef2fed25a0c0086cc

This issue was referenced by d097d35be6

This issue was referenced by d097d35be6df2f109839dde4bbc35a31f69faf89

This issue was referenced by e82c5c6607

This issue was referenced by e82c5c660778b3805f50f3f2901923692c17db2a

Changed status from 'Confirmed' to: 'Resolved'

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Blender crash when showing thumbnail of a strongly skewed .exr image #89868