[Bug 111197] [skl] assertion hits

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111197

--- Comment #20 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Jiri Slaby from comment #19)
> (In reply to Chris Wilson from comment #1)
> > assert(!get_private(back)->bo->active_scanout);
> 
> I have just hit it even after the move: 
> #5  0x00007f00322cb166 in sna_dri2_schedule_swap (client=0x55f38c48fa50,
> draw=0x55f38cc13f70, front=0x55f38c82d200, back=0x55f38ccc6fa0,
> target_msc=0x7ffd7ecee278, divisor=0, remainder=0, func=0x55f38ba5b7c0
> <DRI2SwapEvent>, data=0x55f38cc13f70) at sna_dri2.c:3339
> #6  0x000055f38ba5a90d in DRI2SwapBuffers
> (client=client at entry=0x55f38c48fa50, pDraw=0x55f38cc13f70,
> target_msc=<optimized out>, divisor=0, remainder=0,
> swap_target=swap_target at entry=0x7ffd7ecee318, func=0x55f38ba5b7c0
> <DRI2SwapEvent>, data=0x55f38cc13f70) at dri2.c:1182
> #7  0x000055f38ba5bd5a in ProcDRI2SwapBuffers (client=0x55f38c48fa50) at
> dri2ext.c:424
> #8  ProcDRI2Dispatch (client=0x55f38c48fa50) at dri2ext.c:621
> #9  0x000055f38b9344b4 in Dispatch () at dispatch.c:478
> 
> It took a day to hit it -- in the meantime, I disabled full debug, so no
> more info I have. It happened during switch of virtual desktops.

Bah. That's going to be nasty; it's definitely in the "should never happen"
category. It's at times like that you wish there was a trace_printk.

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