https://bugs.kde.org/show_bug.cgi?id=416266

            Bug ID: 416266
           Summary: digikam crashes during face recognition
           Product: libkface
           Version: unspecified
          Platform: MS Windows
                OS: MS Windows
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: General
          Assignee: imaging-bugs-n...@kde.org
          Reporter: neoderhac...@hotmail.com
  Target Milestone: ---

I am not sure if the actual issue is related to face recognition but it crashes
when I start it
SUMMARY
Local collection on Z:\ drive that is actually a permanent link to a SMB
network attached storage

collection contains several tenthousands of photos

Database stored on local PC
thumbnails-digikam.db 1.5GB
similarity.db 36MB
recognition.db 24 MB
digikam4.db

STEPS TO REPRODUCE
1.  start face recognition on several thousand images
2. 
3. 

OBSERVED RESULT
digikam crashes without any error message

EXPECTED RESULT
digikam stops the operation with an meaningful error message

SOFTWARE/OS VERSIONS
Windows: 10 (1909) 64-bit
digikam version 6.4.0
CPU cores: 4
Eigen: 3.3.7
Exiv2: 0.27.2
Exiv2 can write to Jp2: Yes
Exiv2 can write to Jpeg: Yes
Exiv2 can write to Pgf: Yes
Exiv2 can write to Png: Yes
Exiv2 can write to Tiff: Yes
Exiv2 supports XMP metadata: Yes
HEIF encoding support: Yes
ImageMagick codecs: 7.0.8
KF5: 5.61.0
LensFun: 0.3.95-0
LibCImg: 130
LibJPEG: 90
LibJasper: 2.0.16
LibLCMS: 2090
LibLqr support: No
LibPGF: 7.19.03
LibPNG: 1.6.37
LibRaw: 0.19.5
LibTIFF: 4.0.10
Marble: 0.27.20
Parallelized demosaicing: No
Qt: 5.13.1
Qt Webkit support: Yes
VKontakte support: No
AkonadiContact support: No
Baloo support: No
Calendar support: Yes
DBus support: No
Database backend: QSQLITE
HTML Gallery support: Yes
LibAVCodec: 58.54.100
LibAVFormat: 58.29.100
LibAVUtil: 56.31.100
LibGphoto2 support: No
LibOpenCV: 3.4.7
LibQtAV: 1.13.0
Media player support: Yes
Panorama support: Yes



ADDITIONAL INFORMATION
Dr.Mingw log
digikam.exe caused an Access Violation at location 00007FFBC712594D in module
libdigikamcore.dll Reading from location 000002201CDBEC8E.

AddrPC           Params
00007FFBC712594D 0000000000000000 0000021EB43AD010 0000021EB29D9C70 
libdigikamcore.dll!dimgScaleAARGB 
[/home/gilles/dktemp/digikam-v6.4.0/core/libs/dimg/dimg_scale.cpp @ 1484]
00007FFBC712880E 0000000000000002 00007FFC277C083D 0000000000000002 
libdigikamcore.dll!smoothScaleClipped 
[/home/gilles/dktemp/digikam-v6.4.0/core/libs/dimg/dimg_scale.cpp @ 255]
00007FFBC71288E2 00000072899FBB78 0000021EBFA26010 0000021ECD9C7010 
libdigikamcore.dll!smoothScaleClipped 
[/home/gilles/dktemp/digikam-v6.4.0/core/libs/dimg/dimg_scale.cpp @ 187]
00007FFBC7128969 00000072899FBB80 0000021EA3CE0000 00000072899FBB80 
libdigikamcore.dll!smoothScale 
[/home/gilles/dktemp/digikam-v6.4.0/core/libs/dimg/dimg_scale.cpp @ 176]
00007FFBC71289C1 00000072899FBBB0 0000021EBFA5D190 00000072899FBB98 
libdigikamcore.dll!smoothScale 
[/home/gilles/dktemp/digikam-v6.4.0/core/libs/dimg/dimg_scale.cpp @ 181]
00007FFBADFC4A59 00000072899FBBA0 0000021EAE82BF48 00000072899FBBB0 
libdigikamgui.dll!scaleForDetection 
[/home/gilles/dktemp/digikam-v6.4.0/core/utilities/facemanagement/faceworkers.cpp
@ 61]
00007FFBADFC52C0 0000021EAE82BF30 000000006695084B 0000000000000072 
libdigikamgui.dll!process 
[/home/gilles/dktemp/digikam-v6.4.0/core/utilities/facemanagement/faceworkers.cpp
@ 43]
00007FFBADFD1AF3 0000021EA9DE7C70 0000021EACD68040 0000021EA9DE7480 
libdigikamgui.dll!qt_static_metacall 
[/home/gilles/dktemp/digikam-v6.4.0/build.mxe/core/utilities/facemanagement/facemanagement_src_autogen/EWIEGA46WW/moc_faceworkers.cpp
@ 88]
0000000066954A9A 0000007288FFF3A0 0000021EA591BF10 0000021EB3594F40 
Qt5Core.dll!QObject::event
0000000001087ADC 0000021EA9DE75D0 0000021EADBF7F70 000000000000006D 
Qt5Widgets.dll!QApplicationPrivate::notify_helper
000000000108E9E3 0000021EAE2BA340 00007FFC277BFC11 0000049400000003 
Qt5Widgets.dll!QApplication::notify
00000000669280DA 0000021EA9DE71C0 0000021EACD68040 0000021EA9DEAF30 
Qt5Core.dll!QCoreApplication::notifyInternal2
000000006692F15C 0000000000000401 0000000000060BFC 0000000000000000 
Qt5Core.dll!QCoreApplicationPrivate::sendPostedEvents
00000000669817B6 0000021EB1A83100 00007FFC272F2843 0000000000000001 
Qt5Core.dll!QEventDispatcherWin32Private::sendTimerEvent
00007FFC272E63ED 0000021EA42393A0 0000000066981590 0000000000060BFC 
USER32.dll!UserCallWinProcCheckWow
00007FFC272E5DE2 0000000066981590 0000000000000000 00000072899FC5B0 
USER32.dll!DispatchMessageWorker
0000000066980F7A 0000021EB0918110 0000007200000024 0000021EB30A9DF0 
Qt5Core.dll!QEventDispatcherWin32::processEvents
0000000066926A34 0000021EAE82BF30 0000000000000000 0000000000000000 
Qt5Core.dll!QEventLoop::exec
00007FFBC720E392 0000021EB11D1F90 000000006675E6FF 0000000000000010 
libdigikamcore.dll!run 
[/home/gilles/dktemp/digikam-v6.4.0/core/libs/threads/threadmanager.cpp @ 193]
0000000066764E00 0000021EB0F8D370 0000000000000000 0000000000000000 
Qt5Core.dll!QThreadPool::cancel
000000006675DC8D 0000000000000000 0000000000000000 0000000000000000 
Qt5Core.dll!QThread::qt_metacall
00007FFC26297BD4 0000000000000000 0000000000000000 0000000000000000 
KERNEL32.DLL!BaseThreadInitThunk
00007FFC277ECED1 0000000000000000 0000000000000000 0000000000000000 
ntdll.dll!RtlUserThreadStart

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