[Bug 1963556] Re: Open3D segfaults when compiled with LTO

[Jochen Sprickerhof]

Hi Michael,

> tl;dr: probably an imgui bug causing an out of bounds write trashing
> malloc's internal data structures

Thanks for looking into it, sounds right.

I found that imgui in jammy is compiled with LTO and then statically linked
into open3d. Recompiling open3d (in jammy) with the imgui from Debian fixes
the problem. So I would propose to add imgui to the lto-disabled-list and
recompile open3d afterwards. What do you think?


** Also affects: imgui (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: lto-disabled-list (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1963556

Title:
  Open3D segfaults when compiled with LTO

Status in imgui package in Ubuntu:
  New
Status in lto-disabled-list package in Ubuntu:
  New
Status in open3d package in Ubuntu:
  New

Bug description:
  $ sudo apt install open3d-gui
  $ Open3D
  ...
  Segfault

  We had the same problem in Debian and disabled LTO because of that.

  https://github.com/isl-org/Open3D/issues/4747

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