Forgive me, I'm not very technical, so I apologize if this is the wrong place to post this. I am using Digikam v5.9.0 on 64-Bit Windows 10. I've never experienced this issue before, and it may be related to the same Bug 392134 - SIGSEGV While Scanning Faces [patch] (https://bugs.kde.org/show_bug.cgi?id=392134). 

Whenever I have Digikam scan for faces, it reaches about 29% and then just crashes. I looked for the digikam crash logs and couldn't find any. I was only able to find the Windows Event Viewer and this is what it resulted in:

Faulting application name: digikam.exe, version: 0.0.0.0, time stamp: 0x5aaeb54e
Faulting module name: libdigikamcore.dll, version: 0.0.0.0, time stamp: 0x5aaeb524
Exception code: 0xc0000005
Fault offset: 0x00000000001359a4
Faulting process id: 0x6420
Faulting application start time: 0x01d3cabaa8cde954
Faulting application path: D:\Program Files\digiKam\digikam.exe
Faulting module path: D:\Program Files\digiKam\libdigikamcore.dll
Report Id: 4c358776-a59b-4dee-a25d-b5ae2c6b2f62
Faulting package full name: 
Faulting package-relative application ID: 

- System 

  - Provider 

   [ Name]  Application Error 
 
  - EventID 1000 

   [ Qualifiers]  0 
 
   Level 2 
 
   Task 100 
 
   Keywords 0x80000000000000 
 
  - TimeCreated 

   [ SystemTime]  2018-04-02T19:51:09.891172700Z 
 
   EventRecordID 354488 
 
   Channel Application 
 
   Computer DESKTOP 
 
   Security 
 

- EventData 

   digikam.exe 
   0.0.0.0 
   5aaeb54e 
   libdigikamcore.dll 
   0.0.0.0 
   5aaeb524 
   c0000005 
   00000000001359a4 
   6420 
   01d3cabaa8cde954 
   D:\Program Files\digiKam\digikam.exe 
   D:\Program Files\digiKam\libdigikamcore.dll 
   4c358776-a59b-4dee-a25d-b5ae2c6b2f62 
    
    
Interestingly, the crash entry in the windows event log is consistently always preceded by 2 "Information"-level entries with the source "dbupdate" with the following message: 

The description for Event ID 0 from source dbupdate cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 

Service started

Followed by 10-20 "Error"-level entries with source "VSS" with the following message:
Volume Shadow Copy Service error: Error calling a routine on the Shadow Copy Provider {b5946137-7b9f-4925-af80-51abd60b20d5}. Routine returned E_INVALIDARG. Routine details GetSnapshot({00000000-0000-0000-0000-000000000000},000001D4BFDF2C30). 

Operation:
   Get Shadow Copy Properties

Context:
   Execution Context: Coordinator
- System 

  - Provider 

   [ Name]  VSS 
 
  - EventID 12294 

   [ Qualifiers]  0 
 
   Level 2 
 
   Task 0 
 
   Keywords 0x80000000000000 
 
  - TimeCreated 

   [ SystemTime]  2018-04-02T19:50:48.616200600Z 
 
   EventRecordID 354487 
 
   Channel Application 
 
   Computer DESKTOP 
 
   Security 
 

- EventData 

   {b5946137-7b9f-4925-af80-51abd60b20d5} 
   GetSnapshot({00000000-0000-0000-0000-000000000000},000001D4BFDF2C30) 
   Operation: Get Shadow Copy Properties Context: Execution Context: Coordinator 
   2D20436F64653A20434F52434F4F524330303030303734352D2043616C6C3A20434F52434F4F524330303030303639322D205049443A202030303033313034382D205449443A202030303033303835362D20434D443A2020433A5C57494E444F57535C73797374656D33325C76737376632E6578652020202D20557365723A204E616D653A204E5420415554484F524954595C53595354454D2C205349443A532D312D352D313820 


--------------------------------------------------------------------------------

Binary data:


In Words

0000: 6F43202D 203A6564 43524F43 43524F4F 
0010: 30303030 35343730 6143202D 203A6C6C 
0020: 43524F43 43524F4F 30303030 32393630 
0030: 4950202D 20203A44 33303030 38343031 
0040: 4954202D 20203A44 33303030 36353830 
0050: 4D43202D 20203A44 575C3A43 4F444E49 
0060: 735C5357 65747379 5C32336D 76737376 
0070: 78652E63 20202065 7355202D 203A7265 
0080: 656D614E 544E203A 54554120 49524F48 
0090: 535C5954 45545359 53202C4D 533A4449 
00a0: 352D312D 2038312D   


In Bytes

0000: 2D 20 43 6F 64 65 3A 20   - Code: 
0008: 43 4F 52 43 4F 4F 52 43   CORCOORC
0010: 30 30 30 30 30 37 34 35   00000745
0018: 2D 20 43 61 6C 6C 3A 20   - Call: 
0020: 43 4F 52 43 4F 4F 52 43   CORCOORC
0028: 30 30 30 30 30 36 39 32   00000692
0030: 2D 20 50 49 44 3A 20 20   - PID:  
0038: 30 30 30 33 31 30 34 38   00031048
0040: 2D 20 54 49 44 3A 20 20   - TID:  
0048: 30 30 30 33 30 38 35 36   00030856
0050: 2D 20 43 4D 44 3A 20 20   - CMD:  
0058: 43 3A 5C 57 49 4E 44 4F   C:\WINDO
0060: 57 53 5C 73 79 73 74 65   WS\syste
0068: 6D 33 32 5C 76 73 73 76   m32\vssv
0070: 63 2E 65 78 65 20 20 20   c.exe   
0078: 2D 20 55 73 65 72 3A 20   - User: 
0080: 4E 61 6D 65 3A 20 4E 54   Name: NT
0088: 20 41 55 54 48 4F 52 49    AUTHORI
0090: 54 59 5C 53 59 53 54 45   TY\SYSTE
0098: 4D 2C 20 53 49 44 3A 53   M, SID:S
00a0: 2D 31 2D 35 2D 31 38 20   -1-5-18 

After the series of VSS errors, the Digikam application error appears (as posted above). 

I'm not event sure I'm sharing the right info or if it's in the right place. I tried the IRC channel and there wasn't much activity there and the website urges you to submit these kinds of things here. Basically, the face scanning feature just DOES NOT work beyond 29%. Not sure what I can do to fix it.