[Valgrind-users] Many false positives "Mismatched free() / delete / delete []"

[David F. <fa...@kd...>]

There seems to be a regression in valgrind SVN, where it thinks new[] was used, while in fact a simple new was used.
I see this all over the place when running valgrind on Qt code.

==4799== Mismatched free() / delete / delete []
==4799==    at 0x4C2A65D: operator delete(void*) (vg_replace_malloc.c:576)
==4799==    by 0x6CF853D: QVBoxLayout::~QVBoxLayout() (qboxlayout.cpp:1354)
==4799==    by 0x6D1CE90: QWidget::~QWidget() (qwidget.cpp:1594)
==4799==    by 0x6F631A1: QDialog::~QDialog() (qdialog.cpp:352)
==4799==    by 0x5152C85: Akonadi::EmailAddressSelectionDialog::~EmailAddressSelectionDialog() (emailaddressselectiondialog.cpp:92)
==4799==    by 0x401876: main (emailaddressselectiondialogtest.cpp:35)
==4799==  Address 0x279546e0 is 0 bytes inside a block of size 32 alloc'd
==4799==    at 0x4C29D78: operator new[](unsigned long) (vg_replace_malloc.c:423)
==4799==    by 0x5152DB7: Akonadi::EmailAddressSelectionDialog::Private::Private(Akonadi::EmailAddressSelectionDialog*, QAbstractItemModel*) (emailaddressselectiondialog.cpp:40)
==4799==    by 0x5152B22: Akonadi::EmailAddressSelectionDialog::EmailAddressSelectionDialog(QWidget*) (emailaddressselectiondialog.cpp:82)
==4799==    by 0x401681: main (emailaddressselectiondialogtest.cpp:35)

emailaddressselectiondialog.cpp:40 says
 QVBoxLayout *mainLayout = new QVBoxLayout(q);

And this is just one example, it happens in many many places, it's nothing special about this particular file.

Any idea why this is happening?

gcc (SUSE Linux) 4.8.5
valgrind-3.13.0.SVN
glibc-2.22-3.7.x86_64
`uname -a` = Linux 4.4.36-8-default #1 SMP Fri Dec 9 16:18:38 UTC 2016 (3ec5648) x86_64 x86_64 x86_64 GNU/Linux
OpenSuSE Leap 42.2

-- 
David Faure, fa...@kd..., http://www.davidfaure.fr
Working on KDE Frameworks 5