Comment 72 for bug 1366351

Will try to generate another bug. Meanwhile here's the printout from the gdb commands:

.... similar to above....
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `compiz'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f4ebcc67439 in unity::UnityScreen::paintDisplay (
    this=this@entry=0xb0f000)
    at /build/buildd/unity-7.3.1+14.10.20141016/plugins/unityshell/src/unityshell.cpp:837
837 /build/buildd/unity-7.3.1+14.10.20141016/plugins/unityshell/src/unityshell.cpp: No such file or directory.
(gdb) print gpu_deviceUsing host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `compiz'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f4ebcc67439 in unity::UnityScreen::paintDisplay (
    this=this@entry=0xb0f000)
    at /build/buildd/unity-7.3.1+14.10.20141016/plugins/unityshell/src/unityshell.cpp:837
837 /build/buildd/unity-7.3.1+14.10.20141016/plugins/unityshell/src/unityshell.cpp: No such file or directory.
(gdb) print gpu_device
$1 = <optimized out>
(gdb) print *gpu_device
value has been optimized out
(gdb) print gpu_device->backup_texture0_
value has been optimized out
(gdb) print *(gpu_device->backup_texture0_)
value has been optimized out
(gdb) print gpu_device->backup_texture0_->_NumMipLevel
value has been optimized out
(gdb) print gpu_device->backup_texture0_->_SurfaceArray
value has been optimized out
(gdb)

$1 = <optimized out>
(gdb) print *gpu_device
value has been optimized out
(gdb) print gpu_device->backup_texture0_
value has been optimized out
(gdb) print *(gpu_device->backup_texture0_)
value has been optimized out
(gdb) print gpu_device->backup_texture0_->_NumMipLevel
value has been optimized out
(gdb) print gpu_device->backup_texture0_->_SurfaceArray
value has been optimized out
(gdb)

?

BTW, zsync daily build on 11/06, iso booted to same symptoms.