[Bug mi/34501] gdb responds with corrupt output on trying to inserting a breakpoint

https://sourceware.org/bugzilla/show_bug.cgi?id=34501

--- Comment #5 from Jarmo Tiitto <jarmo.tiitto at gmail dot com> ---
* The configure flags used to build gdb (what steps you used to build it,
including compiler flags if you set any explicitly or in the environment)

I built GDB using Arch Linux's makepkg. I disabled the LTO in the PKGBUILD, to
speed up the build. Aprox steps reproduce the build:

extract https://ftp.gnu.org/gnu/gdb/gdb-17.2.tar.xz to ./gdb
cd ./gdb
export TMPDIR=/var/tmp/jarmo (I did not have enough space in /tmp to build GDB)
mkdir -p build && cd build

printenv outputs following environment variables 

SHELL=/bin/zsh
DEBUG_FFLAGS=-g -ffile-prefix-map=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
VSSCRIPT_PATH=/usr/lib/python3.14/site-packages/vapoursynth/libvsscript.so
PYTHONHASHSEED=0
TEXTDOMAINDIR=/usr/share/locale
GIT_CONFIG_GLOBAL=/dev/null
GPG_TTY=/dev/pts/1
FFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt        
-Wp,-D_FORTIFY_SOURCE=3 -fstack-clash-protection -fcf-protection        
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g
-ffile-prefix-map=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
EDITOR=nano
PWD=/mnt/source/gdb/gdb/src/gdb-17.2/build
SOURCE_DATE_EPOCH=1786387891
LOGNAME=jarmo
CXXFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions        
-Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security        
-fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer
-mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g
-ffile-prefix-map=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
DEBUG_RUSTFLAGS=-C debuginfo=2
--remap-path-prefix=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
MOTD_SHOWN=pam
COMMAND_MODE=legacy
LDFLAGS=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro -Wl,-z,now      
   -Wl,-z,pack-relative-relocs
HOME=/home/jarmo
LANG=en_US.UTF-8
WAYLAND_DISPLAY=/opt/host/wayland-0
GIT_CONFIG_SYSTEM=/etc/makepkg.d/gitconfig
RUSTFLAGS=-C force-frame-pointers=yes -C debuginfo=2
--remap-path-prefix=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
TMPDIR=/var/tmp/jarmo
FCFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt        
-Wp,-D_FORTIFY_SOURCE=3 -fstack-clash-protection -fcf-protection        
-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g
-ffile-prefix-map=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
MAKEFLAGS=-j16
TERM=xterm-256color
USER=jarmo
SHLVL=2
XDG_RUNTIME_DIR=/run/user/1000
DEBUGINFOD_URLS=https://debuginfod.archlinux.org 
XDG_DATA_DIRS=/home/jarmo/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
CHOST=x86_64-pc-linux-gnu
PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/home/jarmo/bin
CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions        
-Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security        
-fstack-clash-protection -fcf-protection         -fno-omit-frame-pointer
-mno-omit-leaf-frame-pointer -g
-ffile-prefix-map=/mnt/source/gdb/gdb/src=/usr/src/debug/gdb
MAIL=/var/spool/mail/jarmo
OLDPWD=/mnt/source/gdb/gdb/src/gdb-17.2
TEXTDOMAIN=pacman-scripts
_=/usr/bin/printenv

Right before running configure and building:

../configure \
--prefix=/usr \
--disable-nls \
--enable-source-highlight \
--enable-tui \
--enable-targets=all \
--enable-languages=all \
--enable-multilib \
--enable-interwork \
--with-system-readline \
--with-python=/usr/bin/python \
--with-system-gdbinit=/etc/gdb/gdbinit
make -j16

* Full steps needed to start gdb and commands run

See the attached tarball, gdb.sh reproduces the bug. I confirmed using the self
built GDB and Arch Linux's official version.
The output is different on purpose from 1st attachment because the
"17-environment-cd" command fails, but this way I don't need to attach any
debugee binaries or source files.

* Minimal set of source files needed for the full steps

No source files are needed.

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