QFile::copy(): Syscall param ioctl(generic) points to unaddressable byte(s)

==2730== Memcheck, a memory error detector
==2730== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==2730== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==2730== Command: ./test_qfile_copy
==2730== 
==2730== Syscall param ioctl(generic) points to unaddressable byte(s)
==2730== at 0x5C415D7: ioctl (syscall-template.S:78)
==2730== by 0x505126F: ??? (in /home/blade/work/software/Qt.5.7_opensource/5.10.0/gcc_64/lib/libQt5Core.so.5.10.0)
==2730== by 0x4FDEEC5: QFile::copy(QString const&) (in /home/blade/work/software/Qt.5.7_opensource/5.10.0/gcc_64/lib/libQt5Core.so.5.10.0)
==2730== by 0x4FDF591: QFile::copy(QString const&, QString const&) (in /home/blade/work/software/Qt.5.7_opensource/5.10.0/gcc_64/lib/libQt5Core.so.5.10.0)
==2730== by 0x108D29: main (in /home/blade/work/projects/test_qfile_copy/test_qfile_copy)
==2730== Address 0x3 is not stack'd, malloc'd or (recently) free'd
==2730== 
Successfully synced to "db.json"
==2730== 
==2730== HEAP SUMMARY:
==2730== in use at exit: 19,108 bytes in 12 blocks
==2730== total heap usage: 93 allocs, 81 frees, 98,502 bytes allocated
==2730== 
==2730== LEAK SUMMARY:
==2730== definitely lost: 0 bytes in 0 blocks
==2730== indirectly lost: 0 bytes in 0 blocks
==2730== possibly lost: 0 bytes in 0 blocks
==2730== still reachable: 19,108 bytes in 12 blocks
==2730== suppressed: 0 bytes in 0 blocks
==2730== Rerun with --leak-check=full to see details of leaked memory
==2730== 
==2730== For counts of detected and suppressed errors, rerun with: -v
==2730== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)