maintainer-feedback requested: [Bug 220565] x11-servers/xorg-server: crashes VirtualBox, starting with r445076, also with r445323

[bugzilla-noreply at freebsd.org]

Martin Birgmeier <la5lbtyi at aon.at> has reassigned Bugzilla Automation
<bugzilla at FreeBSD.org>'s request for maintainer-feedback to x11 at FreeBSD.org:
Bug 220565: x11-servers/xorg-server: crashes VirtualBox, starting with r445076,
also with r445323
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220565



--- Description ---
Scenario:
- Latest Virtualbox running on FreeBSD 11 p8 host
- FreeBSD 11 p8 client (both i386 and amd64 affected)
- KDE installed in client, kdm4 used to start X
- X using vboxvideo driver

Result:
- Starting X in a VirtualBox VM instantly crashes the VM.
- I suspect change r445076, the same behavior persists with r445323

VirtualBox log file entries at the time of the crash:

00:32:48.976072 VBVA: InfoScreen: [0] @0,0 800x600, line 0x1fff8, BPP 32, flags
0x1
00:32:48.988325 VBVA: InfoScreen: [0] @0,0 800x600, line 0xc80, BPP 32, flags
0x1
00:32:48.988382 Display::handleDisplayResize: uScreenId=0
pvVRAM=000000081280a000 w=800 h=600 bpp=32 cbLine=0xC80 flags=0x1
00:32:48.988682 VNCServerImpl::VRDEResize to 800x600x32bpp
00:32:51.625182 VBVA: InfoScreen: [0] @0,0 800x600, line 0xc80, BPP 32, flags
0x1
00:32:51.625239 Display::handleDisplayResize: uScreenId=0
pvVRAM=000000081280a000 w=800 h=600 bpp=32 cbLine=0xC80 flags=0x1
00:32:51.625289 VNCServerImpl::VRDEResize to 800x600x32bpp