[krita] [Bug 523815] New: [gdb stacktrace provided] Segfault on startup

https://bugs.kde.org/show_bug.cgi?id=523815

            Bug ID: 523815
           Summary: [gdb stacktrace provided] Segfault on startup
    Classification: Applications
           Product: krita
      Version First 6.0.3
       Reported In:
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: General
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

DESCRIPTION
After updating to the newer version of Krita provided by Arch Linux (both
6.0.3-1 and 6.0.3-2) they now Segfault on startup. Last version that was
working here was 6.0.2.1-2. The GDB backtrace of said segfault is as follows:

```
Thread 1 "krita" received signal SIGSEGV, Segmentation fault.
0x00007ffff4397050 in KisForestDetail::ChildIterator<FontFamilyNode,
false>::increment (this=<synthetic pointer>) at
/usr/src/debug/krita/krita-6.0.3/libs/global/KisForest.h:205
205             this->m_node = this->m_node->nextSibling;
(gdb) bt
#0  0x00007ffff4397050 in KisForestDetail::ChildIterator<FontFamilyNode,
false>::increment (this=<synthetic pointer>) at
/usr/src/debug/krita/krita-6.0.3/libs/global/KisForest.h:205
#1 
boost::iterators::iterator_core_access::increment<KisForestDetail::ChildIterator<FontFamilyNode,
false> > (f=<synthetic pointer>...) at
/usr/include/boost/iterator/iterator_facade.hpp:506
#2 
boost::iterators::detail::iterator_facade_base<KisForestDetail::ChildIterator<FontFamilyNode,
false>, FontFamilyNode, boost::iterators::bidirectional_traversal_tag,
FontFamilyNode&, long, false, false>::operator++
    (this=<synthetic pointer>) at
/usr/include/boost/iterator/iterator_facade.hpp:608
#3  boost::iterators::operator++<KisForestDetail::ChildIterator<FontFamilyNode,
false>, FontFamilyNode, boost::iterators::bidirectional_traversal_tag,
FontFamilyNode&, long> (i=<synthetic pointer>...)
    at /usr/include/boost/iterator/iterator_facade.hpp:732
#4  KoFFWWSConverter::representationByFamilyName (this=<optimized out>,
familyName=...) at
/usr/src/debug/krita/krita-6.0.3/libs/flake/text/KoFFWWSConverter.cpp:1080
#5  0x00007ffff42f0712 in KoFontRegistry::representationByFamilyName
(this=<optimized out>, familyName=<optimized out>) at
/usr/src/debug/krita/krita-6.0.3/libs/flake/text/KoFontRegistry.cpp:770
#6  0x00007ffff43e3422 in KoFontStorage::resource (this=<optimized out>,
url=<optimized out>) at
/usr/src/debug/krita/krita-6.0.3/libs/flake/resources/KoFontStorage.cpp:120
#7  0x00007ffff7ea658a in KisResourceStorage::resource (this=<optimized out>,
url=<optimized out>) at
/usr/src/debug/krita/krita-6.0.3/libs/resources/KisResourceStorage.cpp:265
#8  0x00007ffff7e822bb in KisResourceCacheDb::synchronizeStorage (storage=...)
at /usr/src/debug/krita/krita-6.0.3/libs/resources/KisResourceCacheDb.cpp:2091
#9  0x00007ffff7e9f1d0 in KisResourceLocator::synchronizeDb
(this=0x555556736c60) at
/usr/src/debug/krita/krita-6.0.3/libs/resources/KisResourceLocator.cpp:1244
#10 0x00007ffff7e91d71 in KisResourceLocator::initialize
(this=this@entry=0x555556736c60, installationResourcesLocation=...) at
/usr/src/debug/krita/krita-6.0.3/libs/resources/KisResourceLocator.cpp:143
#11 0x00007ffff7a55d55 in KisApplication::registerResources
(this=this@entry=0x7fffffffd360) at
/usr/src/debug/krita/krita-6.0.3/libs/ui/KisApplication.cpp:479
#12 0x00007ffff7a585ec in KisApplication::start
(this=this@entry=0x7fffffffd360, args=...) at
/usr/src/debug/krita/krita-6.0.3/libs/ui/KisApplication.cpp:585
#13 0x000055555555c71f in main (argc=<optimized out>, argv=0x7fffffffd548) at
/usr/src/debug/krita/krita-6.0.3/krita/main.cc:869
```

STEPS TO REPRODUCE
1. Update Krita to given version
2. Observe the Segfault

OBSERVED RESULT
Segfault on startup

EXPECTED RESULT
Not segfaulting on splash screen

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.7.3
KDE Frameworks Version: 6.28.0
Qt Version: 6.11.1
Kernel Version: 7.1.4-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 6800HS with Radeon Graphics
Memory: 16 GiB of RAM (14.9 GiB usable)
Graphics Processor 1: AMD Radeon 680M
Graphics Processor 2: AMD Radeon 680M

ADDITIONAL INFORMATION
On the last known working version, 6.0.2.1-2, during startup there is also this
message:

```
Could not execute addResourceVersionImpl statement QSqlError("2067", "Unable to
fetch row", "UNIQUE constraint failed: versioned_resources.resource_id,
versioned_resources.storage_id, versioned_resources.version") 1155
"fontregistry" "fontregistry" "Iosevka" "Iosevka" version 0
SAFE ASSERT (krita): "result" in file
/usr/src/debug/krita/krita-6.0.2.1/libs/resources/KisResourceCacheDb.cpp, line
2160
```

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