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instruction: 0.437
runtime: 0.426
syscall: 0.137
qemu-aarch64-static segfaults running ldconfig.real (amd64 host)
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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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
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Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
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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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