tst_qquickflickable::nestedSliderUsingTouch(keepNeither) failed on Ubuntu 16.04

/home/qt/work/qt/qtdeclarative/tests/auto/quick/qquickflickable/target_wrapper.sh ./tst_qquickflickable nestedSliderUsingTouch
Gtk-Message: Failed to load module "unity-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
Gtk-Message: Failed to load module "canberra-gtk-module"
********* Start testing of tst_qquickflickable *********
Config: Using QtTest library 5.9.0, Qt 5.9.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 5.4.0 20160609)
PASS : tst_qquickflickable::initTestCase()
QINFO : tst_qquickflickable::nestedSliderUsingTouch(keepBoth) qt.qpa.gl: Multithreaded OpenGL disabled: blacklisted vendor "Mesa Project and SGI"
QINFO : tst_qquickflickable::nestedSliderUsingTouch(keepBoth) qt.qpa.gl: Force-enable multithreaded OpenGL by setting environment variable QT_OPENGL_NO_SANITY_CHECK
PASS : tst_qquickflickable::nestedSliderUsingTouch(keepBoth)
PASS : tst_qquickflickable::nestedSliderUsingTouch(keepMouse)
PASS : tst_qquickflickable::nestedSliderUsingTouch(keepTouch)
FAIL! : tst_qquickflickable::nestedSliderUsingTouch(keepNeither) Compared values are not the same
Actual (tda->touchUpdates): 5
Expected (updates) : 6
Loc: [tst_qquickflickable.cpp(2048)]
PASS : tst_qquickflickable::cleanupTestCase()
Totals: 5 passed, 1 failed, 0 skipped, 0 blacklisted, 1403ms