Video Sequence Editor crash with prefetch and meta strips #76033

New Issue

Dario Abatianni · 2020-04-24T01:12:15+02:00

Dario Abatianni commented

2020-04-24 01:12:15 +02:00

System Information
Operating system: Linux-5.2.14-1-default-x86_64-with-glibc2.17 64 Bits
Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21

Blender Version
Broken: version: 2.83 (sub 14), branch: master, commit date: 2020-04-23 08:25, hash: 8dedbb1747
Worked: version: 2.83 'a322b43e3d'

Short description of error
VSE crashes when prefetching is enabled and a meta strip is on the timeline.

Exact steps for others to reproduce the error
Not sure how I managed to finally trigger it in a small example file, but I can't open it anymore to look, because it crashes Blender instantly :-D It probably has to do with disk caching, enabling all cache types (raw, preprocessed ...) and then creating a meta strip. I hope the attached blend file shows the behavior.
lockdown2020_crash_colors_smallest_file.blend

**System Information** Operating system: Linux-5.2.14-1-default-x86_64-with-glibc2.17 64 Bits Graphics card: GeForce GTX 1660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21 **Blender Version** Broken: version: 2.83 (sub 14), branch: master, commit date: 2020-04-23 08:25, hash: `8dedbb1747` Worked: version: 2.83 'a322b43e3d' **Short description of error** VSE crashes when prefetching is enabled and a meta strip is on the timeline. **Exact steps for others to reproduce the error** Not sure how I managed to finally trigger it in a small example file, but I can't open it anymore to look, because it crashes Blender instantly :-D It probably has to do with disk caching, enabling all cache types (raw, preprocessed ...) and then creating a meta strip. I hope the attached blend file shows the behavior. [lockdown2020_crash_colors_smallest_file.blend](https://archive.blender.org/developer/F8491630/lockdown2020_crash_colors_smallest_file.blend)

Dario Abatianni commented

2020-04-24 01:12:15 +02:00

Added subscriber: @Eisfuchs

Ankit Meel commented

2020-04-24 10:01:18 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2020-04-24 10:01:18 +02:00

I can open the file in d4ffd1d91f. Though the playback is all black.

I can open the file in d4ffd1d91f. Though the playback is all black.

Dario Abatianni commented

2020-04-24 11:13:08 +02:00

In #76033#916618, @ankitm wrote:
I can open the file in d4ffd1d91f. Though the playback is all black.

Yes, it's just two black strips inside a meta strip. If it doesn't crash, I assume it's cache related. Is there a way for me to capture a meaningful backtrace without going all out and compiling the whole thing?

> In #76033#916618, @ankitm wrote: > I can open the file in d4ffd1d91f. Though the playback is all black. Yes, it's just two black strips inside a meta strip. If it doesn't crash, I assume it's cache related. Is there a way for me to capture a meaningful backtrace without going all out and compiling the whole thing?

Ankit Meel commented

2020-04-24 15:01:18 +02:00

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

Ankit Meel commented

2020-04-24 15:01:18 +02:00

... to do with disk caching, enabling all cache types (raw, preprocessed ...) ...

even if you complete & share the trace, the developer still needs to redo the case on their system to test it. So if you can find a way to reliably redo it, share the steps, that would be great.

> ... to do with disk caching, enabling all cache types (raw, preprocessed ...) ... even if you complete & share the trace, the developer still needs to redo the case on their system to test it. So if you can find a way to reliably redo it, share the steps, that would be great.

Dario Abatianni commented

2020-04-24 15:14:21 +02:00

I just reproduced it from scratch:

File / New / Video Editing
View / Cache / Raw Images
View / Cache / Preprocessed Images
View / Cache / Composite Images
Add / Color
Duplicate added color strip (shift+d), place it on the next channel on top
Preview / N-Panel / View / Prefetch frames
IMPORTANT: Save the file now, or it won't crash
Select both color strips
ctrl+g
CRASH

lockdown2020_crash_colors_smallest_file_2.blend

I just reproduced it from scratch: - File / New / Video Editing - View / Cache / Raw Images - View / Cache / Preprocessed Images - View / Cache / Composite Images - Add / Color - Duplicate added color strip (shift+d), place it on the next channel on top - Preview / N-Panel / View / Prefetch frames - IMPORTANT: Save the file now, or it won't crash - Select both color strips - ctrl+g - *CRASH* [lockdown2020_crash_colors_smallest_file_2.blend](https://archive.blender.org/developer/F8492544/lockdown2020_crash_colors_smallest_file_2.blend)

Ankit Meel commented

2020-04-25 11:18:07 +02:00

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

Ankit Meel commented

2020-04-25 11:18:07 +02:00

Umm it doesn't crash with the steps you did. Someone else would have to try it.
But I do some undo/redo cycles & it crashes. So after ctrl + g, Undo some steps (cmd + Z), redo some steps (cmd + shift + Z), after 3-4 such cycles it crashes.

- 0	 seq_prefetch_is_cache_full at source/blender/blenkernel/intern/seqprefetch.c:164
- 1	 seq_prefetch_frames at source/blender/blenkernel/intern/seqprefetch.c:358
#2	 tslot_thread_start at source/blender/blenlib/intern/threads.c:258

Umm it doesn't crash with the steps you did. Someone else would have to try it. But I do some undo/redo cycles & it crashes. So after ctrl + g, Undo some steps (cmd + Z), redo some steps (cmd + shift + Z), after 3-4 such cycles it crashes. ``` - 0 seq_prefetch_is_cache_full at source/blender/blenkernel/intern/seqprefetch.c:164 - 1 seq_prefetch_frames at source/blender/blenkernel/intern/seqprefetch.c:358 #2 tslot_thread_start at source/blender/blenlib/intern/threads.c:258 ```

Dario Abatianni commented

2020-04-25 16:02:59 +02:00

Do you have disk caching enabled in Preferences / System / Video Sequencer / Use Disk Cache and saved the blend file before creating the meta?

If I disable Disk Caching, the crash goes away. But with disk cache enabled, creating a meta strip crashes.disk_cache_prefetch_crash.mkv

Do you have disk caching enabled in Preferences / System / Video Sequencer / Use Disk Cache and saved the blend file before creating the meta? If I disable Disk Caching, the crash goes away. But with disk cache enabled, creating a meta strip crashes.[disk_cache_prefetch_crash.mkv](https://archive.blender.org/developer/F8494444/disk_cache_prefetch_crash.mkv)

Richard Antalik commented

2020-05-01 14:59:36 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-05-01 14:59:36 +02:00

In #76033#917604, @Eisfuchs wrote:
Do you have disk caching enabled in Preferences / System / Video Sequencer / Use Disk Cache and saved the blend file before creating the meta?

If I disable Disk Caching, the crash goes away. But with disk cache enabled, creating a meta strip crashes.disk_cache_prefetch_crash.mkv

Thanks for report.
Can you please upload created file /tmp/untitled.crash.txt?

> In #76033#917604, @Eisfuchs wrote: > Do you have disk caching enabled in Preferences / System / Video Sequencer / Use Disk Cache and saved the blend file before creating the meta? > > If I disable Disk Caching, the crash goes away. But with disk cache enabled, creating a meta strip crashes.[disk_cache_prefetch_crash.mkv](https://archive.blender.org/developer/F8494444/disk_cache_prefetch_crash.mkv) Thanks for report. Can you please upload created file /tmp/untitled.crash.txt?

Dario Abatianni commented

2020-05-01 16:09:50 +02:00

untitled.crash.txt

Ah, sorry! I forgot that one! Here it is :-)

[untitled.crash.txt](https://archive.blender.org/developer/F8505845/untitled.crash.txt) Ah, sorry! I forgot that one! Here it is :-)

Richard Antalik commented

2020-05-01 16:25:32 +02:00

In #76033#921649, @Eisfuchs wrote:
untitled.crash.txt

Ah, sorry! I forgot that one! Here it is :-)

Thanks.

For a moment I thought I finally caught #76274, but nope, this is different issue. But thanks for report anyway.

> In #76033#921649, @Eisfuchs wrote: > [untitled.crash.txt](https://archive.blender.org/developer/F8505845/untitled.crash.txt) > > Ah, sorry! I forgot that one! Here it is :-) Thanks. For a moment I thought I finally caught #76274, but nope, this is different issue. But thanks for report anyway.

blender-admin commented

2020-05-01 21:16:50 +02:00

This issue was referenced by 98990f6ba4

This issue was referenced by 98990f6ba439b496e8680d5043ebb18365b9e054

Richard Antalik commented

2020-05-01 21:24:27 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Richard Antalik closed this issue

2020-05-01 21:24:27 +02:00

Richard Antalik self-assigned this 2020-05-01 21:24:27 +02:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Video Sequence Editor crash with prefetch and meta strips #76033