[Bug 2072564] Re: qemu-aarch64-static segfaults running ldconfig.real (amd64 host)

[Sergio Durigan Junior]

** Also affects: qemu via
   https://gitlab.com/qemu-project/qemu/-/issues/1913
   Importance: Unknown
       Status: Unknown

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Title:
  qemu-aarch64-static segfaults running ldconfig.real (amd64 host)

Status in QEMU:
  Unknown
Status in qemu package in Ubuntu:
  Triaged

Bug description:
  This affects the qemu-user-static 1:8.2.2+ds-0ubuntu1 package on
  Ubuntu 24.04, running on a amd64 host.

  When running docker containers with Ubuntu 22.04 in them, emulating
  arm64 with qemu-aarch64-static, invocations of ldconfig (actually
  ldconfig.real) segfault. For example:

  $ docker run -ti --platform linux/arm64/v8 ubuntu:22.04 
  root@8861ff640a1c:/# /sbin/ldconfig.real
  Segmentation fault

  If you copy the ldconfig.real binary to the host, and run it directly
  via qemu-aarch64-static:

  $ gdb --args qemu-aarch64-static ./ldconfig.real 
  GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
  Copyright (C) 2024 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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  Reading symbols from qemu-aarch64-static...
  Reading symbols from 
/home/dim/.cache/debuginfod_client/86579812b213be0964189499f62f176bea817bf2/debuginfo...
  (gdb) r
  Starting program: /usr/bin/qemu-aarch64-static ./ldconfig.real
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7ffff76006c0 (LWP 28378)]

  Thread 1 "qemu-aarch64-st" received signal SIGSEGV, Segmentation fault.
  0x00007fffe801645b in ?? ()
  (gdb) disassemble 
  No function contains program counter for selected frame.

  It looks like this is a known qemu regression after v8.1.1:
  https://gitlab.com/qemu-project/qemu/-/issues/1913

  Downgrading the package to qemu-user-
  static_8.0.4+dfsg-1ubuntu3_amd64.deb fixes the segfault.

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