gdb qtdiag
GNU gdb (GDB) 7.12.1
Copyright (C) 2017 Free Software Foundation, Inc.
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Reading symbols from qtdiag...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/qtdiag 
warning: File "/lib/libthread_db-1.0.so" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load".
To enable execution of this file add
	add-auto-load-safe-path /lib/libthread_db-1.0.so
line to your configuration file "/home/root/.gdbinit".
To completely disable this security protection add
	set auto-load safe-path /
line to your configuration file "/home/root/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
	info "(gdb)Auto-loading safe path"
warning: Unable to find libthread_db matching inferior's thread library, thread debugging will not be available.
QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff6edb600 in QScreen::handle() const () from /usr/lib/libQt5Gui.so.5
(gdb) backtrace full
#0  0x00007ffff6edb600 in QScreen::handle() const () from /usr/lib/libQt5Gui.so.5
No symbol table info available.
#1  0x00007ffff6ee96f1 in QHighDpiScaling::updateHighDpiScaling() () from /usr/lib/libQt5Gui.so.5
No symbol table info available.
#2  0x00007ffff64f5074 in QCoreApplicationPrivate::init() () from /usr/lib/libQt5Core.so.5
No symbol table info available.
#3  0x00007ffff6eaedfc in QGuiApplicationPrivate::init() () from /usr/lib/libQt5Gui.so.5
No symbol table info available.
#4  0x00007ffff6eaf8c4 in QGuiApplication::QGuiApplication(int&, char**, int) () from /usr/lib/libQt5Gui.so.5
No symbol table info available.
#5  0x00000000004052bf in ?? ()
No symbol table info available.
#6  0x00007ffff5b7c4e1 in __libc_start_main () from /lib/libc.so.6
No symbol table info available.
#7  0x000000000040571a in ?? ()
No symbol table info available.
(gdb)