[Bug 91133] [gm45] Invalid GTT entry during Command Fetch from CS prefetch crossing page boundary

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91133

--- Comment #33 from Vincent Legoll <vincent.legoll at gmail.com> ---
I have finally managed to bisect it properly to :
[75d04a3773ecee617847de963ae4195d6aa74c28] drm/i915/gtt: Allocate va range only
if vma is not bound

which is related to performance bug report 
https://bugs.freedesktop.org/show_bug.cgi?id=90224

I tested a kernel just before that commit, no bug, and then that commit itself,
where I reproduced the crash in a few seconds with the "vlc video resize
wiggling" GPU-hanger

But unfortunately cannot test current git without that single patch, as it
won't revert properly...

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