https://bugs.kde.org/show_bug.cgi?id=501113
Bug ID: 501113
Summary: KWin asserts in qCeil
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: nicolas.fe...@gmx.de
Target Milestone: ---
When starting the session
#0 __pthread_kill_implementation (threadid=<optimized out>,
signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1 0x00007f43e5a9b453 in __pthread_kill_internal (threadid=<optimized out>,
signo=6) at pthread_kill.c:89
#2 0x00007f43e5a41cb6 in __GI_raise (sig=sig@entry=6) at
../sysdeps/posix/raise.c:26
#3 0x00007f43e5a2938b in __GI_abort () at abort.c:73
#4 0x00007f43e63aef50 in qAbort () at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qassert.cpp:46
#5 0x00007f43e640a3bf in qt_maybe_message_fatal<QString&>
(msgType=msgType@entry=QtFatalMsg, context=..., message=...)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qlogging.cpp:2059
#6 0x00007f43e640a530 in qt_message(QtMsgType, const QMessageLogContext &,
const char *, typedef __va_list_tag __va_list_tag *)
(msgType=msgType@entry=QtFatalMsg, context=...,
msg=msg@entry=0x7f43e6f18060 "ASSERT: \"%s\" in file %s, line %d",
ap=ap@entry=0x7f43dd6cb020)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qlogging.cpp:337
#7 0x00007f43e6418ba7 in QMessageLogger::fatal
(this=this@entry=0x7f43dd4634a0, msg=msg@entry=0x7f43e6f18060 "ASSERT: \"%s\"
in file %s, line %d")
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qlogging.cpp:826
#8 0x00007f43e63af0b6 in qt_assert (assertion=0x7f43e7020400 "truncatedValue
<= FP((std::numeric_limits<Result>::max)())",
assertion@entry=0x7f43e7045460 "truncatedValue <=
FP((std::numeric_limits<Result>::max)())", file=0x7f43e701fe80
"/home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qnumeric.h",
file@entry=0x7f43e7045380
"/home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qnumeric.h",
line=line@entry=508)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qassert.cpp:106
#9 0x00007f43e693bf3a in QtPrivate::qCheckedFPConversionToInteger<int, double,
true, true> (value=<optimized out>)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/global/qnumeric.h:508
#10 0x00007f43e69aac2e in qCeil<double> (v=<optimized out>) at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qmath.h:30
#11 0x00007f43e69a9a22 in QRectF::toAlignedRect (this=0x7f43dd7d8a00) at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/tools/qrect.cpp:2337
#12 0x00007f43f259d5d8 in KWin::SurfaceInterfacePrivate::mapToBuffer
(this=0x51a00001b080, region=...) at
/home/nico/kde-qtdev/src/kwin/src/wayland/surface.cpp:799
#13 0x00007f43f259c172 in KWin::SurfaceInterfacePrivate::applyState
(this=0x51a00001b080, next=0x519000136580) at
/home/nico/kde-qtdev/src/kwin/src/wayland/surface.cpp:719
#14 0x00007f43f2662e57 in KWin::Transaction::apply (this=0x5030004df860) at
/home/nico/kde-qtdev/src/kwin/src/wayland/transaction.cpp:229
#15 0x00007f43f26632f0 in KWin::Transaction::tryApply (this=0x5030004df860) at
/home/nico/kde-qtdev/src/kwin/src/wayland/transaction.cpp:262
#16 0x00007f43f26620a6 in KWin::Transaction::unlock (this=0x5030004df860) at
/home/nico/kde-qtdev/src/kwin/src/wayland/transaction.cpp:113
#17 0x00007f43f2661345 in operator() (__closure=0x5030004df7e0) at
/home/nico/kde-qtdev/src/kwin/src/wayland/transaction.cpp:51
#18 0x00007f43f26668d8 in operator() (__closure=0x7f43dd45c840) at
/home/nico/kde-qtdev/usr/include/QtCore/qobjectdefs_impl.h:116
#19 0x00007f43f266734d in QtPrivate::FunctorCallBase::call_internal<void,
QtPrivate::FunctorCall<std::integer_sequence<long unsigned int>,
QtPrivate::List<>, void,
KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()>
>::call(KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()>&, void**)::<lambda()> >(void **, struct
{...} &&) (args=0x7f43dd5b2b60, fn=...) at
/home/nico/kde-qtdev/usr/include/QtCore/qobjectdefs_impl.h:65
#20 0x00007f43f26669de in QtPrivate::FunctorCall<std::integer_sequence<long
unsigned int>, QtPrivate::List<>, void,
KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()> >::call(struct {...} &, void **) (f=...,
arg=Python Exception <class 'gdb.MemoryError'>: Cannot access memory at address
0xffffffffffffffc0
#21 0x00007f43f2665ad7 in
QtPrivate::FunctorCallable<KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()> >::call<QtPrivate::List<>, void>(struct
{...} &, void *, void **) (f=..., arg=0x7f43dd5b2b60) at
/home/nico/kde-qtdev/usr/include/QtCore/qobjectdefs_impl.h:337
#22 0x00007f43f2664e1d in
QtPrivate::QCallableObject<KWin::TransactionDmaBufLocker::TransactionDmaBufLocker(const
KWin::DmaBufAttributes*)::<lambda()>, QtPrivate::List<>, void>::impl(int,
QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1,
this_=0x5030004df7d0, r=0x508000c5f1a0, a=0x7f43dd5b2b60, ret=0x0)
at /home/nico/kde-qtdev/usr/include/QtCore/qobjectdefs_impl.h:547
#23 0x00007f43e66c9614 in QtPrivate::QSlotObjectBase::call (this=<optimized
out>, r=0x508000c5f1a0, a=0x7f43dd5b2b60)
at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qobjectdefs_impl.h:461
#24 doActivate<false> (sender=sender@entry=0x50200014b830,
signal_index=<optimized out>, argv=<optimized out>, argv@entry=0x7f43dd5b2b60)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qobject.cpp:4231
#25 0x00007f43e66a798c in QMetaObject::activate
(sender=sender@entry=0x50200014b830, m=m@entry=0x7f43e7210b40
<QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7f43dd5b2b60)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qobject.cpp:4291
#26 0x00007f43e66ff00e in QMetaObject::activate<void, QSocketDescriptor,
QSocketNotifier::Type, QSocketNotifier::QPrivateSignal>
(sender=0x50200014b830, mo=0x7f43e7210b40
<QSocketNotifier::staticMetaObject>, local_signal_index=0, ret=0x0)
at /home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qobjectdefs.h:319
#27 QSocketNotifier::activated (this=this@entry=0x50200014b830, _t1=...,
_t2=QSocketNotifier::Read, _t3=...)
at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/Core_autogen/include/moc_qsocketnotifier.cpp:161
#28 0x00007f43e6700e84 in QSocketNotifier::event (this=0x50200014b830,
e=<optimized out>) at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qsocketnotifier.cpp:327
#29 0x00007f43ea481bc5 in QApplicationPrivate::notify_helper
(this=this@entry=0x515000001200, receiver=receiver@entry=0x50200014b830,
e=e@entry=0x7f43dd3f90a0)
--Type <RET> for more, q to quit, c to continue without paging--c
at
/home/nico/workspace/qt6-dev/qtbase/src/widgets/kernel/qapplication.cpp:3309
#30 0x00007f43ea49d4d9 in QApplication::notify (this=0x7f43ddb07240,
receiver=<optimized out>, e=<optimized out>)
at
/home/nico/workspace/qt6-dev/qtbase/src/widgets/kernel/qapplication.cpp:3259
#31 0x00007f43e65ae908 in QCoreApplication::notifyInternal2
(receiver=0x50200014b830, event=event@entry=0x7f43dd3f90a0)
at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qcoreapplication.cpp:1111
#32 0x00007f43e65aeaf9 in QCoreApplication::sendEvent (receiver=<optimized
out>, event=event@entry=0x7f43dd3f90a0)
at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qcoreapplication.cpp:1551
#33 0x00007f43e6aab855 in QEventDispatcherUNIXPrivate::activateSocketNotifiers
(this=this@entry=0x51200002ca40)
at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:254
#34 0x00007f43e6aac708 in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=...) at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:470
#35 0x00007f43e8bd2f78 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at
/home/nico/workspace/qt6-dev/qtbase/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#36 0x00007f43e65ce208 in QEventLoop::processEvents
(this=this@entry=0x7f43dd5fc840, flags=...) at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qeventloop.cpp:104
#37 0x00007f43e65cf7c7 in QEventLoop::exec (this=this@entry=0x7f43dd5fc840,
flags=...) at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qeventloop.cpp:186
#38 0x00007f43e65b7bcc in QCoreApplication::exec () at
/home/nico/workspace/qt6-dev/qtbase/src/corelib/kernel/qcoreapplication.cpp:1454
#39 0x00007f43e7c47508 in QGuiApplication::exec () at
/home/nico/workspace/qt6-dev/qtbase/src/gui/kernel/qguiapplication.cpp:1993
#40 0x00007f43ea47eae1 in QApplication::exec () at
/home/nico/workspace/qt6-dev/qtbase/src/widgets/kernel/qapplication.cpp:2576
#41 0x0000000000567386 in main (argc=14, argv=0x7ffdcd0d06c8) at
/home/nico/kde-qtdev/src/kwin/src/main_wayland.cpp:622
This is triggered by https://codereview.qt-project.org/c/qt/qtbase/+/622602, so
only affects Qt dev, but it points to a bug in our code since we are invoking
UB
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