[Bug 1995362] Re: ldd / ld-linux-x86-64.so.2 crashes with SIGSEGV when ran against certain shared libraries

[Simon Chopin]

** Also affects: glibc (Ubuntu Kinetic)
   Importance: Undecided
       Status: New

** Changed in: glibc (Ubuntu Kinetic)
       Status: New => Fix Released

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Title:
  ldd / ld-linux-x86-64.so.2 crashes with SIGSEGV when ran against
  certain shared libraries

Status in glibc package in Ubuntu:
  Fix Released
Status in glibc source package in Jammy:
  In Progress
Status in glibc source package in Kinetic:
  Fix Released

Bug description:
  [Impact]

  On Ubuntu 22.04.1 LTS, `ldd` (or rather, the underlying `/lib64/ld-
  linux-x86-64.so.2`) crashes when ran against some of the python
  extension modules from PySide6 PyPI wheels for linux. This does not
  happen under 20.04 nor 22.10, and neither does it happen under Fedora
  36 (which nominally uses the glibc of same version, 2.35).

  When running jammy docker container, the crash does not happen as long
  as glib2 libraries are not installed (are unresolvable).

  The problem was encountered when freezing a PySide6-based python
  application using pyinstaller, which uses `ldd` to perform binary
  analysis (and in cases like this, comes up empty, resulting in missing
  libraries).

  Original bug report:
  https://github.com/pyinstaller/pyinstaller/issues/7197

  The problem (at least in PyInstaller + PySide6 context) might become
  more widespread as `ubuntu-22.04` CI runners become more prevalent on
  the GitHub actions.

  It has been fixed upstream in the following patch:
  https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=10fe3cd309b32c003a6b98e08928e7d6007caecf

  [Test Plan]

  The patch includes tests for this. However, it's fairly easy to test
  on an installed system:

  $ sudo apt install -y python3 python3-venv libglib2.0-0
  $ python3 -m venv venv
  $ . venv/bin/activate
  $ pip install pyside6
  $ LD_TRACE_LOADED_OBJECTS=1 /lib64/ld-linux-x86-64.so.2 venv/lib64/python3.10/site-packages/PySide6/QtQml.abi3.so

  That last command should *NOT* segfault.

  [Regression potential]

  We're touching a fairly sensible part of the system here. Besides "ldd
  is totally broken"-type scenarios, there could be more subtle breakage
  due to changes in the load order of dynamic libraries (unlikely given
  the nature of the patch, though)

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