Crash confirmed, ASAN seems to point to depsgraph evaluation code… @Sergey Sharybin (sergey) mind having a look?

I believe it is fixed in latest blender2.8 branch.

That’s a nasty one… As far as I understand, ASAN claims that in deg_eval_copy_on_write.cc:770, mesh_evaluated->id.orig_id has been freed by depsgraph in main thread… Full backtrace below, but I would assume deg should never free any orig_id ??? Afraid we need Dr @Sergey Sharybin (sergey) here, am running into circles without getting anywhere :/

Actually the usercount gets incremented in pose mode by doing anything action there ( move, scale, selection, rotate ), and note that COW is now default. If you play a bit with the file, just select some bones, rotate, scale, .... and do some undo in the middle, Blender will crash and sometimes not able to open the file anymore(crash on start).