https://bugs.kde.org/show_bug.cgi?id=420074

            Bug ID: 420074
           Summary: DJVU thumbnailer crashes kdeinit
           Product: kio-extras
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Thumbnails and previews
          Assignee: plasma-b...@kde.org
          Reporter: bizy...@zoho.com
  Target Milestone: ---

SUMMARY
Application: kdeinit5 (kdeinit5), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[KCrash Handler]
#6  0x00007ffb79af781e in pthread_join () from /lib64/libpthread.so.0
#7  0x00007ffb5b568c47 in thrd_join (res=0x0, thr=<optimized out>) at
../include/c11/threads_posix.h:329
#8  util_queue_kill_threads (queue=0x7ffb64002c40, keep_num_threads=<optimized
out>, finish_locked=<optimized out>) at ../src/util/u_queue.c:496
#9  0x00007ffb5b568cdc in atexit_handler () at ../src/util/u_queue.c:62
#10 0x00007ffb7b40c138 in __run_exit_handlers () from /lib64/libc.so.6
#11 0x00007ffb7b40c18a in exit () from /lib64/libc.so.6
#12 0x00007ffb4ab2f9e8 in DjVuCreator::create (this=this@entry=0x557c085bff60,
path=..., width=width@entry=128, height=height@entry=128, img=...) at
/usr/src/debug/kio-extras5-19.12.3-lp151.1.2.x86_64/thumbnail/djvucreator.cpp:77
#13 0x00007ffb6cecd297 in ThumbnailProtocol::get (this=0x7ffe9d36c8e0, url=...)
at
/usr/src/debug/kio-extras5-19.12.3-lp151.1.2.x86_64/thumbnail/thumbnail.cpp:266
#14 0x00007ffb739ed7fd in KIO::SlaveBase::dispatch (this=0x7ffe9d36c8e0,
command=67, data=...) at
/usr/src/debug/kio-5.69.0-lp151.286.1.x86_64/src/core/slavebase.cpp:1198
#15 0x00007ffb739ee0e6 in KIO::SlaveBase::dispatchLoop
(this=this@entry=0x7ffe9d36c8e0) at
/usr/src/debug/kio-5.69.0-lp151.286.1.x86_64/src/core/slavebase.cpp:338
#16 0x00007ffb6ceca920 in kdemain (argc=<optimized out>, argv=<optimized out>)
at
/usr/src/debug/kio-extras5-19.12.3-lp151.1.2.x86_64/thumbnail/thumbnail.cpp:138
#17 0x0000557c066695ff in launch (argc=4, _name=0x557c0821c8b8
"/usr/lib64/qt5/plugins/kf5/kio/thumbnail.so", args=<optimized out>,
cwd=<optimized out>, envc=0, envs=<optimized out>, reset_env=false, tty=0x0,
avoid_loops=false, startup_id_str=0x557c0666be73 "0") at
/usr/src/debug/kinit-5.69.0-lp151.207.1.x86_64/src/kdeinit/kinit.cpp:708
#18 0x0000557c0666a73c in handle_launcher_request (sock=7, who=<optimized out>)
at /usr/src/debug/kinit-5.69.0-lp151.207.1.x86_64/src/kdeinit/kinit.cpp:1146
#19 0x0000557c0666b0af in handle_requests (waitForPid=0) at
/usr/src/debug/kinit-5.69.0-lp151.207.1.x86_64/src/kdeinit/kinit.cpp:1339
#20 0x0000557c0666642c in main (argc=1, argv=<optimized out>) at
/usr/src/debug/kinit-5.69.0-lp151.207.1.x86_64/src/kdeinit/kinit.cpp:1777
[Inferior 1 (process 25427) detached]

STEPS TO REPRODUCE
Happens to me when opening folders with DJVU documents in them

OBSERVED RESULT
No thumbnails, drkonqi's crash message

EXPECTED RESULT
Thumbnails are generated

SOFTWARE/OS VERSIONS
Operating System: openSUSE Leap 15.1
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.1
Kernel Version: 5.6.0-2.gbf56c5b-default
OS Type: 64-bit

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