VB crashes when switching from window to fullscreen (Host+F)

[Megachip]

Sometimes, when switching from window to fullscreen, virtual machine window disappear and the virtual machine is marked as crashed.

Latest log entries:

08:55:06.044842 GUI: UIMachineWindow::handleNativeNotification: Notification 'NSWindowWillExitFullScreenNotification' received
08:55:06.045154 UIMachineWindow::handleNativeNotification: Redirecting 'NSWindowWillExitFullScreenNotification' notification to corresponding machine-window...
08:55:06.045210 UIMachineWindowFullscreen::handleNativeNotification: Notification 'NSWindowWillExitFullScreenNotification' received.
08:55:06.045223 UIMachineWindowFullscreen::handleNativeNotification: Native fullscreen mode about to exit, notifying listener...
08:55:06.181553 GUI: UIMachineLogicFullscreen::sltHandleNativeFullscreenWillExit: Machine-window #0 will exit native fullscreen
08:55:06.719043 GUI: UIMachineWindow::handleNativeNotification: Notification 'NSWindowDidExitFullScreenNotification' received
08:55:06.719055 UIMachineWindow::handleNativeNotification: Redirecting 'NSWindowDidExitFullScreenNotification' notification to corresponding machine-window...
08:55:06.719058 UIMachineWindowFullscreen::handleNativeNotification: Notification 'NSWindowDidExitFullScreenNotification' received.
08:55:06.719061 UIMachineWindowFullscreen::handleNativeNotification: Native fullscreen mode exited, notifying listener...
08:55:06.720477 GUI: UIMachineLogicFullscreen::sltHandleNativeFullscreenDidExit: Machine-window #0 exited native fullscreen, changing visual-state to requested...
08:55:08.912327 Display::handleDisplayResize: uScreenId=0 pvVRAM=000000011ecc9000 w=1680 h=1050 bpp=32 cbLine=0x1A40 flags=0x1
08:55:08.912356 GUI: UIFrameBufferPrivate::NotifyChange: Screen=0, Origin=0x0, Size=1680x1050, Sending to async-handler
08:55:08.917657 GUI: UIMachineViewScale::resendSizeHint: Restoring guest size-hint for screen 0 to 1440x900
08:55:08.917679 VMMDev: SetVideoModeHint: Got a video mode hint (1440x900x32)@(0x0),(1;0) at 0
08:55:08.917967 OpenGL: Set OpenGL scale policy on HiDPI displays (fUnscaledHiDPI=0)
08:55:08.919933 OpenGL: Set 3D content scale factor to (8571, 7876), multiplier 10000 (rc=VINF_SUCCESS)
08:55:08.938438 OpenGL: Set 3D content scale factor to (8571, 7666), multiplier 10000 (rc=VINF_SUCCESS)
08:55:09.253520 GUI: UIMachineView::sltHandleNotifyChange: Screen=0, Size=1680x1050
08:55:09.253535 GUI: UIFrameBufferPrivate::handleNotifyChange: Size=1680x1050
08:55:09.253546 GUI: UIFrameBufferPrivate::performResize: Size=1680x1050, Directly using source bitmap content
08:55:09.253705 GUI: UIMachineView::storeGuestSizeHint: Storing guest-screen size-hint for screen 0 as 1680x1050
08:55:09.510201 GUI: UIMediumEnumerator: Machine (or snapshot) event received, ID = d56e627c-578f-4337-a52a-b7c872b1f43c
08:55:09.512154 GUI: UIMediumEnumerator:  Old usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:09.513464 GUI: UIMediumEnumerator:  New usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:09.513482 GUI: UIMediumEnumerator:  Items currently in usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:09.513551 GUI: UIMediumEnumerator: Machine (or snapshot) event processed, ID = d56e627c-578f-4337-a52a-b7c872b1f43c
08:55:09.519719 Switching Gl mode off
08:55:09.519883 GUI: UIMediumEnumerator: Medium-enumeration finished!
08:55:09.520787 Display::handleDisplayResize: uScreenId=0 pvVRAM=000000011ecc9000 w=1680 h=1050 bpp=32 cbLine=0x1A40 flags=0x1
08:55:09.520812 GUI: UIFrameBufferPrivate::NotifyChange: Screen=0, Origin=0x0, Size=1680x1050, Sending to async-handler
08:55:09.526380 Display::handleDisplayResize: uScreenId=0 pvVRAM=000000011ecc9000 w=1440 h=900 bpp=32 cbLine=0x1680 flags=0x1
08:55:09.526411 GUI: UIFrameBufferPrivate::NotifyChange: Screen=0, Origin=0x0, Size=1440x900, Sending to async-handler
08:55:09.527195 VMMDev: Guest Log: VBoxDisp[0]: VBVA enabled
08:55:09.527224 VBVA: InfoScreen: [0] @0,0 1440x900, line 0x1680, BPP 32, flags 0x1
08:55:09.527243 Display::handleDisplayResize: uScreenId=0 pvVRAM=000000011ecc9000 w=1440 h=900 bpp=32 cbLine=0x1680 flags=0x1
08:55:09.527270 GUI: UIFrameBufferPrivate::NotifyChange: Screen=0, Origin=0x0, Size=1440x900, Sending to async-handler
08:55:09.533594 GUI: UIMachineView::sltHandleNotifyChange: Screen=0, Size=1680x1050
08:55:09.533605 GUI: UIFrameBufferPrivate::handleNotifyChange: Size=1680x1050
08:55:09.533614 GUI: UIFrameBufferPrivate::performResize: Size=1680x1050, Directly using source bitmap content
08:55:09.534452 GUI: UIMachineView::storeGuestSizeHint: Storing guest-screen size-hint for screen 0 as 1680x1050
08:55:09.538860 GUI: UIMachineView::sltHandleNotifyChange: Screen=0, Size=1440x900
08:55:09.538871 GUI: UIFrameBufferPrivate::handleNotifyChange: Size=1440x900
08:55:09.539005 GUI: UIMachineView::storeGuestSizeHint: Storing guest-screen size-hint for screen 0 as 1440x900
08:55:09.752626 GUI: UIMachineView::sltHandleNotifyChange: Screen=0, Size=1440x900
08:55:09.752638 GUI: UIFrameBufferPrivate::handleNotifyChange: Size=1440x900
08:55:09.752763 GUI: UIMachineView::storeGuestSizeHint: Storing guest-screen size-hint for screen 0 as 1440x900
08:55:09.820907 2D is supported!
08:55:09.873237 GUI: UIMediumEnumerator: Machine (or snapshot) event received, ID = d56e627c-578f-4337-a52a-b7c872b1f43c
08:55:09.873289 GUI: UIMediumEnumerator:  Old usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:09.874704 GUI: UIMediumEnumerator:  New usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:09.874715 GUI: UIMediumEnumerator:  Items currently in usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:09.874757 GUI: UIMediumEnumerator: Machine (or snapshot) event processed, ID = d56e627c-578f-4337-a52a-b7c872b1f43c
08:55:09.903769 GUI: UIMediumEnumerator: Medium-enumeration finished!
08:55:10.776490 Switching Gl mode on
08:55:12.613982 Switching Gl mode off
08:55:17.098030 GUI: UIMultiScreenLayout::update: GUI/AutomountGuestScreens is disabled
08:55:17.099800 Display::handleDisplayResize: uScreenId=0 pvVRAM=000000011ecc9000 w=1440 h=900 bpp=32 cbLine=0x1680 flags=0x1
08:55:17.099828 GUI: UIFrameBufferPrivate::NotifyChange: Screen=0, Origin=0x0, Size=1440x900, Sending to async-handler
08:55:17.102540 OpenGL: Set 3D content scale factor to (10000, 10000), multiplier 10000 (rc=VINF_SUCCESS)
08:55:17.102574 OpenGL: Set OpenGL scale policy on HiDPI displays (fUnscaledHiDPI=0)
08:55:17.107272 GUI: UIMachineViewFullscreen::adjustGuestScreenSize: Adjust guest-screen size if necessary.
08:55:17.107286 GUI: UIMachineView::sltPerformGuestResize: Sending guest size-hint to screen 0 as 1680x1050
08:55:17.107298 VMMDev: SetVideoModeHint: Got a video mode hint (1680x1050x32)@(0x0),(1;0) at 0
08:55:17.107760 GUI: UIMachineLogicFullscreen::revalidateNativeFullScreen: For machine-window #0
08:55:17.107768 GUI: UIMachineLogicFullscreen::revalidateNativeFullScreen: Ask machine-window #0 to enter native fullscreen
08:55:17.107893 GUI: UIMachineViewFullscreen::adjustGuestScreenSize: Adjust guest-screen size if necessary.
08:55:17.107899 GUI: UIMachineView::sltPerformGuestResize: Sending guest size-hint to screen 0 as 1680x1050
08:55:17.134223 GUI: UIMachineWindow::handleNativeNotification: Notification 'NSWindowWillEnterFullScreenNotification' received
08:55:17.134239 UIMachineWindow::handleNativeNotification: Redirecting 'NSWindowWillEnterFullScreenNotification' notification to corresponding machine-window...
08:55:17.134242 UIMachineWindowFullscreen::handleNativeNotification: Notification 'NSWindowWillEnterFullScreenNotification' received.
08:55:17.134245 UIMachineWindowFullscreen::handleNativeNotification: Native fullscreen mode about to enter, notifying listener...
08:55:17.204133 GUI: UIMediumEnumerator: Machine (or snapshot) event received, ID = d56e627c-578f-4337-a52a-b7c872b1f43c
08:55:17.204180 GUI: UIMediumEnumerator:  Old usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:17.205581 GUI: UIMediumEnumerator:  New usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:17.205593 GUI: UIMediumEnumerator:  Items currently in usage: 06da1835-639e-4eda-8361-d27a59857a64, 84f3f635-65a0-42b1-9236-1f0c06ec3a5e
08:55:17.205677 GUI: UIMediumEnumerator: Machine (or snapshot) event processed, ID = d56e627c-578f-4337-a52a-b7c872b1f43c
08:55:17.205941 GUI: UIMachineView::sltHandleNotifyChange: Screen=0, Size=1440x900
08:55:17.205950 GUI: UIFrameBufferPrivate::handleNotifyChange: Size=1440x900
08:55:17.205959 GUI: UIFrameBufferPrivate::performResize: Size=1440x900, Directly using source bitmap content

OSX 10.11.1 on a MBP (15", mid 2014, 2 monitors attached)

[Megachip]

As requested

[Frank Mehnert]

Could you provide a core dump? See here.