Crash on Preview as Backdrop in Video Sequencer #80029

New Issue

Sekhar Ravinutala · 2020-08-23T00:18:59+02:00

Sekhar Ravinutala commented

2020-08-23 00:18:59 +02:00

System Information
Operating system: Linux-5.7.16-200.fc32.x86_64-x86_64-with-fedora-32-Thirty_Two 64 Bits
Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.66

Blender Version
Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-08-21 15:35, hash: ebf10b72b0
Worked: Not sure

Short description of error
Blender crashes when you select Preview as Backdrop in Video Sequencer, regardless of content

Exact steps for others to reproduce the error
Open Video Sequencer, click on View->Preview as Backdrop. Blender crashes.

**System Information** Operating system: Linux-5.7.16-200.fc32.x86_64-x86_64-with-fedora-32-Thirty_Two 64 Bits Graphics card: GeForce RTX 2080 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 450.66 **Blender Version** Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-08-21 15:35, hash: `ebf10b72b0` Worked: Not sure **Short description of error** Blender crashes when you select Preview as Backdrop in Video Sequencer, regardless of content **Exact steps for others to reproduce the error** Open Video Sequencer, click on View->Preview as Backdrop. Blender crashes.

Sekhar Ravinutala commented

2020-08-23 00:18:59 +02:00

Added subscriber: @Sekhar

blender-admin commented

2020-08-23 00:18:59 +02:00

#80052 was marked as duplicate of this issue

Robert Guetzkow commented

2020-08-23 01:14:06 +02:00

Added subscriber: @rjg

Robert Guetzkow commented

2020-08-23 01:14:06 +02:00

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

Robert Guetzkow commented

2020-08-23 01:14:06 +02:00

Can confirm on the master branch WM_draw_region_get_viewport(region); in sequencer_draw_preview returns NULL. The viewport pointer is dereferenced in GPU_viewport_framebuffer_list_get which results in the crash.

GPU_viewport_framebuffer_list_get(GPUViewport * viewport) Line 328	C
GPU_viewport_framebuffer_overlay_get(GPUViewport * viewport) Line 1046	C
sequencer_draw_preview(const bContext * C, Scene * scene, ARegion * region, SpaceSeq * sseq, int cfra, int frame_ofs, bool draw_overlay, bool draw_backdrop) Line 1774	C
draw_timeline_seq(const bContext * C, ARegion * region) Line 2280	C
sequencer_main_region_draw(const bContext * C, ARegion * region) Line 523	C
ED_region_do_draw(bContext * C, ARegion * region) Line 535	C
wm_draw_window_offscreen(bContext * C, wmWindow * win, bool stereo) Line 697	C
wm_draw_window(bContext * C, wmWindow * win) Line 825	C
wm_draw_update(bContext * C) Line 1028	C
WM_main(bContext * C) Line 483	C
main(int argc, const unsigned char * * UNUSED_argv_c) Line 548	C

Can confirm on the master branch `WM_draw_region_get_viewport(region);` in `sequencer_draw_preview` returns `NULL`. The `viewport` pointer is dereferenced in `GPU_viewport_framebuffer_list_get` which results in the crash. ``` GPU_viewport_framebuffer_list_get(GPUViewport * viewport) Line 328 C GPU_viewport_framebuffer_overlay_get(GPUViewport * viewport) Line 1046 C sequencer_draw_preview(const bContext * C, Scene * scene, ARegion * region, SpaceSeq * sseq, int cfra, int frame_ofs, bool draw_overlay, bool draw_backdrop) Line 1774 C draw_timeline_seq(const bContext * C, ARegion * region) Line 2280 C sequencer_main_region_draw(const bContext * C, ARegion * region) Line 523 C ED_region_do_draw(bContext * C, ARegion * region) Line 535 C wm_draw_window_offscreen(bContext * C, wmWindow * win, bool stereo) Line 697 C wm_draw_window(bContext * C, wmWindow * win) Line 825 C wm_draw_update(bContext * C) Line 1028 C WM_main(bContext * C) Line 483 C main(int argc, const unsigned char * * UNUSED_argv_c) Line 548 C ```

Robert Guetzkow commented

2020-08-23 01:31:20 +02:00

This affects 2.90 beta as well, 2.83.5 doesn't crash.

Hans Goudey commented

2020-08-23 02:40:48 +02:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2020-08-23 02:40:48 +02:00

In that case we should tag 2.90 so this doesn't get forgotten.

Robert Guetzkow commented

2020-08-23 19:10:46 +02:00

Added subscriber: @tiles

Dalai Felinto commented

2020-08-25 12:51:13 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2020-08-25 12:51:13 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Dalai Felinto closed this issue

2020-08-25 12:51:13 +02:00

Dalai Felinto self-assigned this 2020-08-25 12:51:13 +02:00

Dalai Felinto commented

2020-08-25 12:51:13 +02:00

This was fixed by reverting the multi-view fix: 40edb84dcf

This was fixed by reverting the multi-view fix: 40edb84dcf4f05fe2d6a73170617af0eab0cd5ff

Philipp Oeser commented

2020-08-28 15:05:27 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-08-28 15:05:27 +02:00

Changed status from 'Resolved' to: 'Confirmed'

Philipp Oeser reopened this issue

2020-08-28 15:05:27 +02:00

Philipp Oeser commented

2020-08-28 15:05:27 +02:00

It is not fixed, it is still happening in master

Philipp Oeser commented

2020-08-28 15:09:02 +02:00

Added subscriber: @Sergey

Philipp Oeser commented

2020-08-28 15:09:02 +02:00

Since @Sergey also merged #80184 (VSE: Crash when switching on Preview as Backdrop) into #79940 (VSE Editor crash when opening a different scene as a strip), will do the same here...

Philipp Oeser commented

2020-08-28 15:09:16 +02:00

Closed as duplicate of #79940

Philipp Oeser closed this issue

2020-08-28 15:09:16 +02:00

Thomas Dinges added this to the 2.90 milestone 2023-02-08 16:25:40 +01:00

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Crash on Preview as Backdrop in Video Sequencer #80029