Undo causes crash with "Load UI" disabled
Closed, ResolvedPublicBUG
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Description

System Information
Operating system: Windows 10
Graphics card: NVIDIA GeForce RTX 2060

Blender Version
Broken: 2.83 (sub 13), branch: master, commit date: 2020-04-17 20:03, hash: 76b3aac802f9, type: Release, also in 2.90 (1f1520a04503)
build date: 2020-04-17, 21:04:49
Worked: Blender 2.82a

Short description of error

Blender crashes when performing Undo with Load UI disabled

Exact steps for others to reproduce the error

CrashTest.blend786 KBDownload

Open Blender
Reset to factory settings (File - Defaults - Load Factory Settings)
In Preferences, turn off Load UI (Save & Load section)
Click "Save Preferences"
Open the file CrashTest.blend
Perform any action in the scene (I rotated the camera)
Perform Undo (Ctrl-Z)
Observe crash

Note! If I clear the scene, I can perform any action and undo it without a crash. For example I created a cube, rotated it and performed an undo without a problem.

Revisions and Commits

rB Blender
	rBbc3aab3fa547 Fix T75893: Undo causes crash with "Load UI" disabled.

Related Objects

Mentioned In: T76392: Crash with Load UI off and calling the same template twice
T75978: Undo crashes Blender
Mentioned Here: rB1f1520a04503: Merge branch 'blender-v2.83-release'
rB76b3aac802f9: Fix T75842: GPencil Edit mode of unselected object is visible

Event Timeline

Antti Teittinen (ate1) created this task.Apr 19 2020, 1:10 PM

There were some fixes for the new undo, and I can't recreate this here. Even with various memory utilities enabled (that should aggressively check for and detect any memory issues, which are typically the cause of such crashes).

Could you test with a newer 2.83 and if that doesn't work, a 2.90 build? https://builder.blender.org/download/

Tested with the latest 2.90 (1f1520a04503) and it works fine. No crash.

Great, closing then :)

I managed to recreate this bug also in 2.90 (1f1520a04503). Might warrant a reopening.

Open Blender
Reset to factory settings (File - Defaults - Load Factory Settings)
In Preferences, turn off Load UI (Save & Load section)
Click "Save Preferences"
Open the file CrashTest.blend
Perform any action in the scene (I rotated the camera)
Perform Undo (Ctrl-Z)
Observe crash

Getting a failed assert:

/home/guest/blender/software/git/blender/build/bin/blender(BLI_system_backtrace+0xb9) [0x6466b79]
/home/guest/blender/software/git/blender/build/bin/blender(BKE_main_idmap_create+0xb57) [0x4f85349]
/home/guest/blender/software/git/blender/build/bin/blender(blo_make_old_idmap_from_main+0x116) [0x1a5176b]
/home/guest/blender/software/git/blender/build/bin/blender(BLO_read_from_memfile+0x3d7) [0x1a38113]
/home/guest/blender/software/git/blender/build/bin/blender(BKE_blendfile_read_from_memfile+0x66) [0x4f3644f]
/home/guest/blender/software/git/blender/build/bin/blender(BKE_memfile_undo_decode+0x38e) [0x4f329a8]
/home/guest/blender/software/git/blender/build/bin/blender() [0x466da72]
/home/guest/blender/software/git/blender/build/bin/blender() [0x4ff0184]
/home/guest/blender/software/git/blender/build/bin/blender(BKE_undosys_step_undo_with_data_ex+0x555) [0x4ff5fbd]
/home/guest/blender/software/git/blender/build/bin/blender(BKE_undosys_step_undo_with_data+0x2d) [0x4ff65b2]
/home/guest/blender/software/git/blender/build/bin/blender(BKE_undosys_step_undo+0x89) [0x4ff663d]
/home/guest/blender/software/git/blender/build/bin/blender() [0x46648d0]
/home/guest/blender/software/git/blender/build/bin/blender() [0x46651db]
/home/guest/blender/software/git/blender/build/bin/blender() [0x466648d]
/home/guest/blender/software/git/blender/build/bin/blender() [0x1913845]
/home/guest/blender/software/git/blender/build/bin/blender() [0x191b677]
/home/guest/blender/software/git/blender/build/bin/blender() [0x191f22b]
/home/guest/blender/software/git/blender/build/bin/blender() [0x19228fd]
/home/guest/blender/software/git/blender/build/bin/blender() [0x1923c7a]
/home/guest/blender/software/git/blender/build/bin/blender(wm_event_do_handlers+0x249a) [0x192a0de]
/home/guest/blender/software/git/blender/build/bin/blender(WM_main+0x30) [0x18f814c]
/home/guest/blender/software/git/blender/build/bin/blender() [0xbe4883]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xeb) [0x7fdd39846e0b]
/home/guest/blender/software/git/blender/build/bin/blender(_start+0x2a) [0xbe3cba]
BLI_assert failed: /home/guest/blender/software/git/blender/src/source/blender/blenkernel/intern/main_idmap.c:126, BKE_main_idmap_create(), at 'existing_key == 0'
Aborted

Julian Eisel (Severin) renamed this task from Undo causes crash to Undo causes crash with "Load UI" disabled.Apr 20 2020, 1:15 AM

Julian Eisel (Severin) updated the task description. (Show Details)Apr 20 2020, 1:17 AM

Julian Eisel (Severin) moved this task from Backlog to bcon3: Bugs on the BF Blender (2.83) board.Apr 20 2020, 1:21 AM

Julian Eisel (Severin) changed the subtype of this task from "Report" to "Bug".

Bastien Montagne (mont29) added a project: Pipeline, Assets & I/O.Apr 21 2020, 9:50 AM

Bastien Montagne (mont29) moved this task from Backlog to Bugs on the Pipeline, Assets & I/O board.Apr 21 2020, 9:53 AM

Bastien Montagne (mont29) claimed this task.Apr 21 2020, 3:54 PM

Bastien Montagne (mont29) closed this task as Resolved by committing rBbc3aab3fa547: Fix T75893: Undo causes crash with "Load UI" disabled..Apr 21 2020, 6:29 PM

Bastien Montagne (mont29) added a commit: rBbc3aab3fa547: Fix T75893: Undo causes crash with "Load UI" disabled..

Brecht Van Lommel (brecht) mentioned this in T75978: Undo crashes Blender.Apr 22 2020, 11:03 AM

Brecht Van Lommel (brecht) merged a task: T75978: Undo crashes Blender.Apr 22 2020, 5:21 PM

Brecht Van Lommel (brecht) added subscribers: Marcus Papathoma (machieb), Brecht Van Lommel (brecht).