[Bug 94515] xorg-server 1.18.2 freeze desktop on i915

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94515

--- Comment #42 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Leho Kraav (:macmaN :lkraav) from comment #40)
> I got the freeze and I'm on UXA GLAMOR, not SNA. Are we sure this patch is
> related?

Yes. The bug is the client is requesting a target_msc that wraps around onto
the current msc. No backend handled that overflow and so all are susceptible.
The patch adds a check for the overflow when casting from the 64bit target_msc
into the 32bit hardware sequence number and reporting the error from the
driver.

The bug as far as I can tell so far is that the requested divisor received from
the Client is 1<<32 rather than 1. That suggests that the two CARD32 in the
protocol have been swapped, but that seems unlikely...

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