Hi,

After upgrading libreadline8t64 from 8.2-6 to 8.3-2 iwctl (from the iwd
package) no longer works on my system and simply segfaults on start. My
system is a T14s Gen6 Snapdragon based on arm64. Downgrading libreadline8t64
to the previous 8.2-6 version fixes the issue. Here is a stacktrace of
the problem, which also points into libreadline functions:
---------------------------------------------------------------------------
(gdb) bt
#0  0x0000fffff7eb0398 in update_line (old=<optimized out>, old_face=<optimized out>,
    new=<optimized out>, new_face=0xaaaaaab1c650 "", current_line=current_line@entry=0,
    omax=<optimized out>, nmax=<optimized out>, inv_botlin=inv_botlin@entry=0) at ./display.c:2207
#1  0x0000fffff7eb3648 [PAC] in rl_redisplay () at ./display.c:1368
#2  0x0000aaaaaaaaf804 [PAC] in display_enable_cmd_prompt () at client/display.c:802
#3  0x0000aaaaaaaad004 [PAC] in get_managed_objects_callback (message=0xaaaaaab26070,
    user_data=<optimized out>) at client/dbus-proxy.c:777
#4  0x0000fffff7f28328 [PAC] in handle_method_return (dbus=dbus@entry=0xaaaaaab027a0,
    message=message@entry=0xaaaaaab26070) at ell/dbus.c:204
#5  0x0000fffff7f288fc [PAC] in message_read_handler (io=<optimized out>, user_data=0xaaaaaab027a0)
    at ell/dbus.c:264
#6  0x0000fffff7f1d54c [PAC] in io_callback (fd=<optimized out>, events=1, user_data=0xaaaaaab02880)
    at ell/io.c:105
#7  0x0000fffff7f1c3ec [PAC] in l_main_iterate (timeout=<optimized out>) at ell/main.c:461
#8  0x0000fffff7f1c4e8 [PAC] in l_main_run () at ell/main.c:508
#9  l_main_run () at ell/main.c:490
#10 0x0000fffff7f1c728 [PAC] in l_main_run_with_signal (
    callback=callback@entry=0xaaaaaaaa8040 <signal_handler>, user_data=user_data@entry=0x0)
    at ell/main.c:630
#11 0x0000aaaaaaaa7eb4 [PAC] in main (argc=1, argv=0xffffffffef58) at client/main.c:70
---------------------------------------------------------------------------

Thanks for maintaining readline,

(gdb) bt
#0  0x00007ffff7ee1e38 in update_line (old=<optimized out>, old_face=0x5555555b1d80 '0' <repeats 27 times>, new=0x5555555b2190 "", new_face=0x5555555b25a0 "", current_line=current_line@entry=0, omax=27, nmax=0, inv_botlin=0) at ./display.c:2207
#1  0x00007ffff7ee4bfd in rl_redisplay () at ./display.c:1368
#2  0x0000555555562c81 in display_enable_cmd_prompt () at client/display.c:802
#3  0x000055555556042e in get_managed_objects_callback (message=0x5555555bbe60, user_data=<optimized out>) at client/dbus-proxy.c:777
#4  0x00007ffff7f370c5 in handle_method_return (dbus=dbus@entry=0x555555598770, message=message@entry=0x5555555bbe60) at ell/dbus.c:204
#5  0x00007ffff7f37631 in message_read_handler (io=<optimized out>, user_data=0x555555598770) at ell/dbus.c:264
#6  0x00007ffff7f2d020 in io_callback (fd=<optimized out>, events=1, user_data=0x555555598850) at ell/io.c:105
#7  0x00007ffff7f2c155 in l_main_iterate (timeout=<optimized out>) at ell/main.c:461
#8  0x00007ffff7f2c21c in l_main_run () at ell/main.c:508
#9  l_main_run () at ell/main.c:490
#10 0x00007ffff7f2c43f in l_main_run_with_signal (callback=callback@entry=0x55555555bb20 <signal_handler>, user_data=user_data@entry=0x0) at ell/main.c:630
#11 0x000055555555b9e3 in main (argc=1, argv=0x7fffffffe108) at client/main.c:70

Greetings,

Hi,

It's me again. Apparently the bug has already been reported upstream
(twice) by Arch with the first link having a patch, which supposedly
fixes the issue and the second link having a minimal test case:

https://lists.gnu.org/archive/html/bug-readline/2025-07/msg00005.html
https://lists.gnu.org/archive/html/bug-readline/2025-07/msg00006.html

The patch has been provided by Chet Ramey, but is not yet part of any
release (and/or upstream git) as far as I could see. Looks like Arch
carries it downstream for now, so I suggest we do the same in Debian.

Greetings,

We believe that the bug you reported is fixed in the latest version of
readline, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1114021@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Matthias Klose <doko@debian.org> (supplier of updated readline package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sat, 06 Sep 2025 11:35:13 +0200
Source: readline
Built-For-Profiles: noudeb
Architecture: source
Version: 8.3-3
Distribution: unstable
Urgency: medium
Maintainer: Matthias Klose <doko@debian.org>
Changed-By: Matthias Klose <doko@debian.org>
Closes: 1114021
Changes:
 readline (8.3-3) unstable; urgency=medium
 .
   * Fix segfault, reported for iwd. Closes: #1114021.
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