I think the issue is that a thread is reading sensor data and leaking
memory, I put a breakpoint on mprotect calls and found most are from:
(gdb) where
#0 mprotect () at ../sysdeps/unix/syscall-template.S:82
#1 0xb5eeb19c in grow_heap (diff=4096, h=0xb1400000) at arena.c:617
#2 sysmalloc (av=0xb1400010, nb=72) at malloc.c:2387
#3 _int_malloc (av=av@entry=0xb1400010, bytes=bytes@entry=64) at malloc.c:3800
#4 0xb5eec122 in __GI___libc_malloc (bytes=64) at malloc.c:2891
#5 0xb60420f4 in operator new(unsigned int) ()
from /usr/lib/arm-linux-gnueabihf/libstdc++.so.6
#6 0xb629e1a8 in QObject::QObject(QObject*) ()
from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#7 0xb3a86eb4 in QSensorReading::QSensorReading(QObject*,
QSensorReadingPrivate*) () from /usr/lib/arm-linux-gnueabihf/libQt5Sensors.so.5
#8 0xb3a890f8 in QAccelerometerReading::QAccelerometerReading(QObject*) ()
from /usr/lib/arm-linux-gnueabihf/libQt5Sensors.so.5
#9 0xb1fb123c in ?? ()
from
/usr/lib/arm-linux-gnueabihf/qt5/plugins/sensors/libqtubuntu_sensors_plugins.so
#10 0xb1f9f9fc in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
I wonder if the sensor object pool is not freeing memory, there is an
interesting comment:
void core::SharedAccelerometer::onAccelerometerReading(UASAccelerometerEvent
*event)
{
Q_ASSERT(event != NULL);
// TODO(tvoss): We should rely on an object pool to recycle accelerometer
reading
// instances here. We could use a custom deleter for the shared pointer to
put
// instances that have been successfully delivered to slots back into the
pool.
QSharedPointer<QAccelerometerReading> reading(new QAccelerometerReading());
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https://bugs.launchpad.net/bugs/1364404
Title:
qmlscene is leaking ~1.7K per second on an idle application on the
phone
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