[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 #35 from Chris Wilson <chris at chris-wilson.co.uk> ---
It looks like the Client sent PresentPixmap with a divisor=1<<32, or even
target_msc of 1<<32.

I think

commit f656f6afa288c63968f45d6d32c96a4cf6213117
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Mar 22 22:11:18 2016 +0000

    sna/present: Report BadValue if target_msc exceeds last known msc by 1<<32

    As we cannot queue a vblank further than 1<<32 into the future, nor can
    we set a Timer to expire that far into the future, creating such a
    vblank event is futile. Report BadValue and hope for the best.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=94515
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

should hide the immediate issue with the freeze / busy spin.

Can someone attach gdb and put a breakpoint on present_pixmap() line 953, just
after present_queue_vblank() returns an error and print the locals? I am most
interested in getting the arguments to the function so we can compare what the
client requested with the computed vblank.

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