Merge / Delete vertices crashes for some meshes #36923
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Reference: blender/blender#36923
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Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
%%%Mesh operations that include that depend on (bmo_delete_exec -> BMO_remove_tagged_context) are unstable in trunk builds.
Any of these combination sequences will crash blender.
With torus:
Shift+A 1 0 Tab X 1
Shift+A 1 0 Tab X 2
Shift+A 1 0 Tab X 3
Shift+A 1 0 Tab Alt+M 1
Shift+A 1 0 Tab Alt+M 2
Shift+A 1 0 Tab Alt+M 3
... etc ...
Or with 2 suzannes: Shift+A 1 9 Tab Shift+D Enter A A Alt+M 1
Tested with r60509.
ASAN logs for X1 and Alt+M1 attached.%%%
Changed status to: 'Open'
%%%can you attach a file right before the crash (so one opens the file and merge to crash)?
I couldn't reproduce the error here, but I may have misinterpreted your instructions.
%%%
%%%Yes, open torus.blend from attachments and merge at center. Note that this is a heap-use-after-free problem, so it may survive the first attempt (but not with address-sanitizer). If you undo and repeat merge few times, blender will crash in no time.%%%
%%%it doesn't seem to crash here (OSX). I'll leave for Campbell to handle. It may help to know your OS/building setup and if this happens with the official 2.69RC.%%%
%%%Strange nobody noticed this before, fixed r60523. and added asserts to catch any other occurrences of this bug (deleting while iterating).%%%
Changed status from 'Open' to: 'Resolved'