I am experiencing exactly the same issue on Ubuntu 24.04. Stack trace
is:
```
Thread 1 "gnome-screensav" received signal SIGSEGV, Segmentation fault.
0x0000000000000003 in ?? ()
(gdb) bt
#0 0x0000000000000003 in ??? ()
#1 0x00007ffff703e207 in XQueryExtension
(dpy=0x5555555a7690, name=0x7ffff7003000 "XFree86-VidModeExtension",
major_opcode=0x7fffffffdc44, first_event=0x7fffffffdc48,
first_error=0x7fffffffdc4c)
at ../../src/QuExt.c:48
#2 0x00007ffff7035097 in XInitExtension (dpy=dpy@entry=0x5555555a7690,
name=name@entry=0x7ffff7003000 "XFree86-VidModeExtension") at
../../src/InitExt.c:59
#3 0x00007ffff714b840 in XextAddDisplay
(extinfo=0x7ffff7005110 <_xf86vidmode_info_data>, dpy=0x5555555a7690,
ext_name=ext_name@entry=0x7ffff7003000 "XFree86-VidModeExtension",
hooks=hooks@entry=0x7ffff70050a0 <xf86vidmode_extension_hooks>,
nevents=nevents@entry=0, data=data@entry=0x0) at ../../src/extutil.c:110
#4 0x00007ffff7000419 in find_display (dpy=<optimized out>) at
../../src/XF86VMode.c:80
#5 0x00007ffff7000456 in XF86VidModeQueryExtension (dpy=<optimized out>,
event_basep=event_basep@entry=0x7fffffffdd58,
error_basep=error_basep@entry=0x7fffffffdd5c)
at ../../src/XF86VMode.c:97
#6 0x000055555556ccf5 in check_gamma_extension (fade=<optimized out>,
screen_idx=0) at /usr/src/gnome-screensaver-3.6.1-13ubuntu4/src/gs-fade.c:426
#7 gs_fade_init (fade=0x5555556d2e80 [GSFade]) at
/usr/src/gnome-screensaver-3.6.1-13ubuntu4/src/gs-fade.c:919
#8 0x00007ffff72e2ff9 in g_type_create_instance (type=<optimized out>) at
../../../gobject/gtype.c:1951
#9 0x00007ffff72c8a64 in g_object_new_internal (class=0x5555556d3fa0,
params=0x0, n_params=0) at ../../../gobject/gobject.c:2603
#10 0x00007ffff72ca016 in g_object_new_internal (n_params=<optimized out>,
params=<optimized out>, class=<optimized out>) at
../../../gobject/gobject.c:2600
#11 g_object_new_with_properties (object_type=<optimized out>,
n_properties=<optimized out>, names=names@entry=0x0, values=values@entry=0x0)
at ../../../gobject/gobject.c:2766
#12 0x00007ffff72caf71 in g_object_new (object_type=<optimized out>,
first_property_name=first_property_name@entry=0x0) at
../../../gobject/gobject.c:2412
#13 0x000055555556b301 in gs_fade_new () at
/usr/src/gnome-screensaver-3.6.1-13ubuntu4/src/gs-fade.c:960
#14 gs_monitor_init (monitor=0x55555564d220 [GSMonitor]) at
/usr/src/gnome-screensaver-3.6.1-13ubuntu4/src/gs-monitor.c:446
#15 0x00007ffff72e2ff9 in g_type_create_instance (type=<optimized out>) at
../../../gobject/gtype.c:1951
#16 0x00007ffff72c8a64 in g_object_new_internal (class=0x5555556a42d0,
params=0x0, n_params=0) at ../../../gobject/gobject.c:2603
#17 0x00007ffff72ca016 in g_object_new_internal (n_params=<optimized out>,
params=<optimized out>, class=<optimized out>) at
../../../gobject/gobject.c:2600
#18 g_object_new_with_properties (object_type=<optimized out>,
n_properties=<optimized out>, names=names@entry=0x0, values=values@entry=0x0)
at ../../../gobject/gobject.c:2766
#19 0x00007ffff72caf71 in g_object_new (object_type=<optimized out>,
first_property_name=first_property_name@entry=0x0) at
../../../gobject/gobject.c:2412
#20 0x000055555556113a in gs_monitor_new () at
/usr/src/gnome-screensaver-3.6.1-13ubuntu4/src/gs-monitor.c:490
#21 0x000055555555ec34 in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/gnome-screensaver-3.6.1-13ubuntu4/src/gnome-screensaver.c:88
```
gnome-screensaver version is: 3.6.1-13ubuntu4
--
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https://bugs.launchpad.net/bugs/1747938
Title:
gnome-screensaver crashed with SIGSEGV in XQueryExtension()
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