Renaming Video Strip then scrubbing crashes (prefetching frames) #79757

New Issue

james99 · 2020-08-13T21:01:10+02:00

james99 commented

2020-08-13 21:01:10 +02:00

System Information
Operating system: 5.3.0-62-generic #56~18.04.1-Ubuntu SMP Wed Jun 24 16:17:03 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Graphics card: Intel UHD 620 GPU - lenovo x1 carbon 6th gen

Blender Version
Broken: Blender 2.83.4, Commit date: 2020-08-05 06:00, Hash c113af8288
Worked: not sure

Short description of error
Renaming a strip in the video editor crashes blender with a segfault

Exact steps for others to reproduce the error
Renaming a strip in the video editor (and then scrubbing) crashes blender with a segfault

Blender 2.83.4, Commit date: 2020-08-05 06:00, Hash `c113af8288`

bpy.context.scene.sequence_editor.sequences_all["ffff"].name = "ffff" # Property

backtrace

/snap/blender/43/blender(BLI_system_backtrace+0x1d) [0x6988dbd]
/snap/blender/43/blender() [0xc158a2]
/lib/x86_64-linux-gnu/libc.so.6(+0x3efd0) [0x7fbc1c914fd0]
/snap/blender/43/blender(BKE_sequencer_cache_put+0xe2) [0xe8f722]
/snap/blender/43/blender() [0xcf0d71]
/snap/blender/43/blender() [0xcf1a16]
/snap/blender/43/blender() [0xcf22b4]
/snap/blender/43/blender(BKE_sequencer_give_ibuf+0x119) [0xcf3979]
/snap/blender/43/blender() [0xea27af]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x76db) [0x7fbc1e05a6db]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x3f) [0x7fbc1c9f7a3f]

**System Information** Operating system: 5.3.0-62-generic #56~18.04.1-Ubuntu SMP Wed Jun 24 16:17:03 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Graphics card: Intel UHD 620 GPU - lenovo x1 carbon 6th gen **Blender Version** Broken: Blender 2.83.4, Commit date: 2020-08-05 06:00, Hash c113af82881a Worked: not sure **Short description of error** Renaming a strip in the video editor crashes blender with a segfault **Exact steps for others to reproduce the error** Renaming a strip in the video editor (and then scrubbing) crashes blender with a segfault # Blender 2.83.4, Commit date: 2020-08-05 06:00, Hash c113af82881a bpy.context.scene.sequence_editor.sequences_all["ffff"].name = "ffff" # Property # backtrace /snap/blender/43/blender(BLI_system_backtrace+0x1d) [0x6988dbd] /snap/blender/43/blender() [0xc158a2] /lib/x86_64-linux-gnu/libc.so.6(+0x3efd0) [0x7fbc1c914fd0] /snap/blender/43/blender(BKE_sequencer_cache_put+0xe2) [0xe8f722] /snap/blender/43/blender() [0xcf0d71] /snap/blender/43/blender() [0xcf1a16] /snap/blender/43/blender() [0xcf22b4] /snap/blender/43/blender(BKE_sequencer_give_ibuf+0x119) [0xcf3979] /snap/blender/43/blender() [0xea27af] /lib/x86_64-linux-gnu/libpthread.so.0(+0x76db) [0x7fbc1e05a6db] /lib/x86_64-linux-gnu/libc.so.6(clone+0x3f) [0x7fbc1c9f7a3f]

james99 commented

2020-08-13 21:01:10 +02:00

Added subscriber: @james99

Philipp Oeser commented

2020-08-14 10:15:57 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-08-14 10:15:57 +02:00

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

Philipp Oeser commented

2020-08-14 10:15:57 +02:00

Cannot reproduce here.

I cannot reproduce this with either the latest stable or current development versions of Blender:
Please try the latest daily build: https://builder.blender.org/download/
Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue.

If the problem persists, please share the .blend file where this happens.

Cannot reproduce here. I cannot reproduce this with either the latest stable or current development versions of Blender: Please try the latest daily build: https://builder.blender.org/download/ Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue. If the problem persists, please share the .blend file where this happens.

james99 commented

2020-08-14 11:14:36 +02:00

Hi Phillipp,

I just checked again and the error still occurs after resetting to Factory settings. Blender file attached. I will try the daily build later today.

It seems like a basic thing to break so severely, maybe something is wrong with my systems/drivers. Nevertheless, we might be able to produce a better error message for people with a similar problem in the future if we find out what is going on here :)

pithes.blend

Hi Phillipp, I just checked again and the error still occurs after resetting to Factory settings. Blender file attached. I will try the daily build later today. It seems like a basic thing to break so severely, maybe something is wrong with my systems/drivers. Nevertheless, we might be able to produce a better error message for people with a similar problem in the future if we find out what is going on here :) [pithes.blend](https://archive.blender.org/developer/F8779784/pithes.blend)

Philipp Oeser commented

2020-08-14 11:33:43 +02:00

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

Philipp Oeser commented

2020-08-14 11:33:43 +02:00

Added subscriber: @iss

Philipp Oeser commented

2020-08-14 11:33:44 +02:00

Ah, can reproduce now.
After renaming, I have to start scrubbing to cause the crash.

BKE_sequencer_prefetch_get_original_sequence cant get a sequence here

1 BKE_sequencer_cache_put    seqcache.c    1347 0x3678a8a      
2 seq_render_preprocess_ibuf sequencer.c   3884 0x33c3061      
3 seq_render_strip           sequencer.c   3911 0x33c316d      
4 seq_render_strip_stack     sequencer.c   4027 0x33c35ae      
5 BKE_sequencer_give_ibuf    sequencer.c   4124 0x33c3a11      
6 seq_prefetch_frames        seqprefetch.c 459  0x36928ff      
7 tslot_thread_start         threads.cc    226  0xb88ad90      
8 start_thread                                  0x7ffff7f61432 
9 clone                                         0x7ffff78cf913

Reminds me of #79357 (Blender VES crashing when performing cuts in Video/Audio strips), D8421: Fix #79357: VSE crash on prefetching when performing cuts, D8256: Fix #78573: Crash when removing strips with prefetching

@iss: I think the same applies here? [in this case, stop prefetching when the strip name changes].
Dont have the time to look at that today, mind taking over?

Ah, can reproduce now. After renaming, I have to start scrubbing to cause the crash. `BKE_sequencer_prefetch_get_original_sequence` cant get a sequence here ``` 1 BKE_sequencer_cache_put seqcache.c 1347 0x3678a8a 2 seq_render_preprocess_ibuf sequencer.c 3884 0x33c3061 3 seq_render_strip sequencer.c 3911 0x33c316d 4 seq_render_strip_stack sequencer.c 4027 0x33c35ae 5 BKE_sequencer_give_ibuf sequencer.c 4124 0x33c3a11 6 seq_prefetch_frames seqprefetch.c 459 0x36928ff 7 tslot_thread_start threads.cc 226 0xb88ad90 8 start_thread 0x7ffff7f61432 9 clone 0x7ffff78cf913 ``` Reminds me of #79357 (Blender VES crashing when performing cuts in Video/Audio strips), [D8421: Fix #79357: VSE crash on prefetching when performing cuts](https://archive.blender.org/developer/D8421), [D8256: Fix #78573: Crash when removing strips with prefetching](https://archive.blender.org/developer/D8256) @iss: I think the same applies here? [in this case, stop prefetching when the strip name changes]. Dont have the time to look at that today, mind taking over?

Philipp Oeser changed title from ~~Renaming Video Strip Crashes Blender on Ubuntu~~ to Renaming Video Strip then scrubbing crashes (prefetching frames)

2020-08-14 11:36:42 +02:00

Richard Antalik commented

2020-08-14 11:48:53 +02:00

In #79757#995953, @lichtwerk wrote:
Ah, can reproduce now.
After renaming, I have to start scrubbing to cause the crash.

BKE_sequencer_prefetch_get_original_sequence cant get a sequence here
1 BKE_sequencer_cache_put    seqcache.c    1347 0x3678a8a      
2 seq_render_preprocess_ibuf sequencer.c   3884 0x33c3061      
3 seq_render_strip           sequencer.c   3911 0x33c316d      
4 seq_render_strip_stack     sequencer.c   4027 0x33c35ae      
5 BKE_sequencer_give_ibuf    sequencer.c   4124 0x33c3a11      
6 seq_prefetch_frames        seqprefetch.c 459  0x36928ff      
7 tslot_thread_start         threads.cc    226  0xb88ad90      
8 start_thread                                  0x7ffff7f61432 
9 clone                                         0x7ffff78cf913 
Reminds me of #79357 (Blender VES crashing when performing cuts in Video/Audio strips), D8421: Fix #79357: VSE crash on prefetching when performing cuts, D8256: Fix #78573: Crash when removing strips with prefetching

@iss: I think the same applies here? [in this case, stop prefetching when the strip name changes].
Dont have the time to look at that today, mind taking over?

Yes, it's same issue. I will go over all operators this time, just to get this issue over with

> In #79757#995953, @lichtwerk wrote: > Ah, can reproduce now. > After renaming, I have to start scrubbing to cause the crash. > > `BKE_sequencer_prefetch_get_original_sequence` cant get a sequence here > > ``` > 1 BKE_sequencer_cache_put seqcache.c 1347 0x3678a8a > 2 seq_render_preprocess_ibuf sequencer.c 3884 0x33c3061 > 3 seq_render_strip sequencer.c 3911 0x33c316d > 4 seq_render_strip_stack sequencer.c 4027 0x33c35ae > 5 BKE_sequencer_give_ibuf sequencer.c 4124 0x33c3a11 > 6 seq_prefetch_frames seqprefetch.c 459 0x36928ff > 7 tslot_thread_start threads.cc 226 0xb88ad90 > 8 start_thread 0x7ffff7f61432 > 9 clone 0x7ffff78cf913 > ``` > > Reminds me of #79357 (Blender VES crashing when performing cuts in Video/Audio strips), [D8421: Fix #79357: VSE crash on prefetching when performing cuts](https://archive.blender.org/developer/D8421), [D8256: Fix #78573: Crash when removing strips with prefetching](https://archive.blender.org/developer/D8256) > > @iss: I think the same applies here? [in this case, stop prefetching when the strip name changes]. > Dont have the time to look at that today, mind taking over? Yes, it's same issue. I will go over all operators this time, just to get this issue over with

james99 commented

2020-08-14 18:02:32 +02:00

Let me know if there is anything else you need from me.

Do you have a suggestion for a workaround? Apart from not renaming clips, which I did yesterday.

Let me know if there is anything else you need from me. Do you have a suggestion for a workaround? Apart from not renaming clips, which I did yesterday.

Evan Wilson commented

2020-08-14 18:21:29 +02:00

Added subscriber: @EAW

Evan Wilson commented

2020-08-14 18:21:29 +02:00

In #79757#996272, @james99 wrote:
Do you have a suggestion for a workaround? Apart from not renaming clips, which I did yesterday.

Uncheck Prefetch Frames.
https://docs.blender.org/manual/en/latest/video_editing/preview/properties.html?highlight=prefetch

> In #79757#996272, @james99 wrote: > Do you have a suggestion for a workaround? Apart from not renaming clips, which I did yesterday. Uncheck `Prefetch Frames`. https://docs.blender.org/manual/en/latest/video_editing/preview/properties.html?highlight=prefetch

blender-admin commented

2020-08-17 20:19:11 +02:00

This issue was referenced by 4b69e55da3

This issue was referenced by 4b69e55da358cbfe98fd9ac85151a7107315959b

Richard Antalik commented

2020-08-17 20:37:09 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Richard Antalik closed this issue

2020-08-17 20:37:09 +02:00

Richard Antalik self-assigned this 2020-08-17 20:37:09 +02:00

Thomas Dinges added this to the 2.90 milestone 2023-02-08 16:25:41 +01:00

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Renaming Video Strip then scrubbing crashes (prefetching frames) #79757

Blender 2.83.4, Commit date: 2020-08-05 06:00, Hash c113af8288

backtrace

Blender 2.83.4, Commit date: 2020-08-05 06:00, Hash `c113af8288`