[Bug 1952814] Re: Inconsistency detected by ld.so: dl-deps.c when dlopen .so, built with --filter option

[Andrei Podoplelov]

This bug has easy fix: remove line 549 (v2.27) in dl-deps.c, saying
assert(map->l_searchlist.r_list[0] == map);

I checked all the glibc sources after v2.27, which runs on my Ubuntu 18.04. I see that this bug is fixes in v2.32.
It would be nice to fix it for Ubuntu 18.04 and 20.04 - easy one line fix.

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Title:
  Inconsistency detected by ld.so: dl-deps.c when dlopen .so, built with
  --filter option

Status in glibc package in Ubuntu:
  New

Bug description:
  Having libFilter.so built with --filter=libFiltee.so.
  Running prog-bug, which contains dlopen("libFilter.so"), you'll get "Inconsistency detected by ld.so: dl-deps.c: 553: _dl_map_object_deps: Assertion `map->l_searchlist.r_list[0] == map' failed!"

  The issue is reproducible on Ubuntu 16.04, 18.04, 20.04, although the
  dl-deps.c line number may be different.

  The attached file contains full C source code, the binaries, and the
  build script.

  To reproduce:
  1) Unzip and cd to the folder.
  2) Define LD_LIBRARY_PATH
  $ export LD_LIBRARY_PATH=.
  3) Run correct executable prog-ok, not having dlopen call, behaves as expected.
  $ prog-ok
  4) Run prog-bug, which demonstrates the issue, having dlopen, and produces the above error.
  $ prog-bug
  Optionally you may rebuild the binaries, using _build.sh script.

  The same error appears running:
  $ ldd libFilter.so

  I am using Ubuntu 18.04.6 LTS with libc6 v2.27-3ubuntu1.4.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: libc6 2.27-3ubuntu1.4
  ProcVersionSignature: Ubuntu 4.15.0-162.170-generic 4.15.18
  Uname: Linux 4.15.0-162-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.27
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Nov 30 17:52:07 2021
  Dependencies:
   gcc-11-base 11.1.0-1ubuntu1~18.04.1 [origin: LP-PPA-ubuntu-toolchain-r-test]
   libc6 2.27-3ubuntu1.4
   libgcc-s1 11.1.0-1ubuntu1~18.04.1 [origin: LP-PPA-ubuntu-toolchain-r-test]
   libgcc1 1:11.1.0-1ubuntu1~18.04.1 [origin: LP-PPA-ubuntu-toolchain-r-test]
  InstallationDate: Installed on 2020-05-03 (576 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: glibc
  UpgradeStatus: No upgrade log present (probably fresh install)

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