Hi,

Sorry for the verbose title.  If I put a debian-9 VM in true fullscreen
in XFCE, I get a short hang, then the window disappears.  The VM then
goes 'yellow', and while I can xl console into the VM, I lose all windows.

The GUID log has:
ErrorHandler: BadAccess (attempt to access private resource denied)
                 Major opcode: 130 (MIT-SHM)
                 Minor opcode: 1 (X_ShmAttach)
                 ResourceID:   0x440003c
                 Failed serial number:  548
                 Current serial number: 549

And indeed, using 'ps' in Dom0 shows that the corresponding qubes-guid
has crashed :(.

The VM dmesg logs are also filled with a bunch of messages like the
following:
[   15.385864] U2MFN_GET_MFN_FOR_PAGE: get_user_pages failed,
ret=0xfffffffffffffff2

I suspect this is related to my most recent qubes-guid update, as this
behavior never occurred before.

Andrew

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