https://bugs.kde.org/show_bug.cgi?id=474175

            Bug ID: 474175
           Summary: Kamoso crashes on startup.
    Classification: Applications
           Product: kamoso
           Version: 23.04.3
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Keywords: drkonqi
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: aleix...@kde.org
          Reporter: sabir.aliyev.it...@gmail.com
  Target Milestone: ---

Application: kamoso (23.04.3)

Qt Version: 5.15.10
Frameworks Version: 5.109.0
Operating System: Linux 6.4.12-200.fc38.x86_64 x86_64
Windowing System: X11
Distribution: Fedora Linux 38 (KDE Plasma)
DrKonqi: 5.27.7 [KCrashBackend]

-- Information about the crash:
Kamoso crashes on startup. 

OS: Fedora Linux 38 KDE Plasma.

Camera: A4tech FHD 1080P PC camera.

PC:
Architecture:                       x86_64
CPU op-mode(s):                     32-bit, 64-bit
Address sizes:                      39 bits physical, 48 bits virtual
Byte Order:                         Little Endian
CPU(s):                             16
On-line CPU(s) list:                0-15
Vendor ID:                          GenuineIntel
Model name:                         Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz
CPU family:                         6
Model:                              165
Thread(s) per core:                 2
Core(s) per socket:                 8
Socket(s):                          1
Stepping:                           5
CPU(s) scaling MHz:                 89%
CPU max MHz:                        4800.0000
CPU min MHz:                        800.0000
BogoMIPS:                           5799.77
Flags:                              fpu vme de pse tsc msr pae mce cx8 apic sep
mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good
nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl
vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe
popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch
cpuid_fault invpcid_single ssbd ibrs ibpb stibp ibrs_enhanced tpr_shadow
flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms
invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves
dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp vnmi pku ospke
md_clear flush_l1d arch_capabilities
Virtualization:                     VT-x
L1d cache:                          256 KiB (8 instances)
L1i cache:                          256 KiB (8 instances)
L2 cache:                           2 MiB (8 instances)
L3 cache:                           16 MiB (1 instance)
NUMA node(s):                       1
NUMA node0 CPU(s):                  0-15
Vulnerability Gather data sampling: Mitigation; Microcode
Vulnerability Itlb multihit:        KVM: Mitigation: Split huge pages
Vulnerability L1tf:                 Not affected
Vulnerability Mds:                  Not affected
Vulnerability Meltdown:             Not affected
Vulnerability Mmio stale data:      Mitigation; Clear CPU buffers; SMT
vulnerable
Vulnerability Retbleed:             Mitigation; Enhanced IBRS
Vulnerability Spec rstack overflow: Not affected
Vulnerability Spec store bypass:    Mitigation; Speculative Store Bypass
disabled via prctl
Vulnerability Spectre v1:           Mitigation; usercopy/swapgs barriers and
__user pointer sanitization
Vulnerability Spectre v2:           Mitigation; Enhanced / Automatic IBRS, IBPB
conditional, RSB filling, PBRSB-eIBRS SW sequence
Vulnerability Srbds:                Mitigation; Microcode
Vulnerability Tsx async abort:      Not affected

The crash can be reproduced every time.

-- Backtrace:
Application: Kamoso (kamoso), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f3f4068b331 in g_type_check_instance_is_fundamentally_a () from
/lib64/libgobject-2.0.so.0
#5  0x00007f3f40675d10 in g_object_notify () from /lib64/libgobject-2.0.so.0
#6  0x00007f3f406644ea in g_closure_invoke () from /lib64/libgobject-2.0.so.0
#7  0x00007f3f40692e16 in signal_emit_unlocked_R.isra.0 () from
/lib64/libgobject-2.0.so.0
#8  0x00007f3f40683cbd in g_signal_emit_valist () from
/lib64/libgobject-2.0.so.0
#9  0x00007f3f40683f33 in g_signal_emit () from /lib64/libgobject-2.0.so.0
#10 0x00007f3f4066f6b4 in g_object_dispatch_properties_changed.lto_priv () from
/lib64/libgobject-2.0.so.0
#11 0x00007f3f406f28f9 in gst_object_dispatch_properties_changed () from
/lib64/libgstreamer-1.0.so.0
#12 0x00007f3f40664ab0 in g_object_notify_queue_thaw.lto_priv () from
/lib64/libgobject-2.0.so.0
#13 0x00007f3f40677ad6 in g_object_set_valist () from
/lib64/libgobject-2.0.so.0
#14 0x00007f3f40677f1d in g_object_set () from /lib64/libgobject-2.0.so.0
#15 0x00007f3effe72c11 in gst_camera_bin_change_state () from
/lib64/gstreamer-1.0/libgstcamerabin.so
#16 0x00007f3f40722a14 in gst_element_change_state () from
/lib64/libgstreamer-1.0.so.0
#17 0x00007f3f407232c9 in gst_element_set_state_func.lto_priv () from
/lib64/libgstreamer-1.0.so.0
#18 0x00005617f76c71b7 in WebcamControl::playDevice(Device*) ()
#19 0x00005617f76c850e in webcamWatch(_GstBus*, _GstMessage*, void*) ()
#20 0x00007f3f40709657 in gst_bus_source_dispatch () from
/lib64/libgstreamer-1.0.so.0
#21 0x00007f3f3f91348c in g_main_context_dispatch () from
/lib64/libglib-2.0.so.0
#22 0x00007f3f3f971648 in g_main_context_iterate.isra () from
/lib64/libglib-2.0.so.0
#23 0x00007f3f3f910b13 in g_main_context_iteration () from
/lib64/libglib-2.0.so.0
#24 0x00007f3f3fd06749 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /lib64/libQt5Core.so.5
#25 0x00007f3f3fcb2b6b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/lib64/libQt5Core.so.5
#26 0x00007f3f3fcbadfb in QCoreApplication::exec() () from
/lib64/libQt5Core.so.5
#27 0x00005617f76c2b28 in main ()
[Inferior 1 (process 6661) detached]

Reported using DrKonqi

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