[Bug 95185] sna_driver causes X-server to get SIGSEGV

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95185

--- Comment #2 from Jason Vas Dias <jason.vas.dias at gmail.com> ---
(In reply to Chris Wilson from comment #1)
> Your patches are incorrect. Perhaps if you used the once in the source?

Please explain what you mean by this - I cannot determine what this might be.

Patch A allows the Xorg server to start without core dumping:
--- kgem.c~     2016-04-25 23:32:41.073898879 +0000
+++ kgem.c      2016-04-28 12:20:41.006474178 +0000
@@ -2789 +2789 @@
-       kgem->retire(kgem);
+        if(NULL != kgem->retire) kgem->retire(kgem);

Patch B prevents the Xorg server core dumping on window manager initialization:
@@ -2971 +2971,2 @@
+               if ((kgem->fence[rq->ring] == NULL) &&
+                   (NULL != rq) && (NULL != rq->bo) && (NULL !=
rq->bo->handle) 

Unfortunately, while it does prevent the XServer from core dumping,
Patch B does not allow it to proceed - it just hangs - it is rather weird,
because at first the Xserver starts and displays an xterm; then, when
I try to start the window manager, the graphical display disappears ,
a blank screen is displayed, and the machine ceases to respond to any
keystroke (like the the VT-Switch sequence: <CTRL>+<ALT>+<F[N]>
to switch to terminal N, or <CTRL>+<ALT>+<DEL> to reboot - none of 
them have any effect) .

At first, this hang was caused by the x86-video-intel driver coredumping 
when trying to invoke  __kgem_busy(kgem, rq->bo->handle) when rq->bo is NULL,
at kgem.c line 2973, but now with Patch B fixing this, there is no coredump,
but the server still hangs the machine and there is no display of anything
(text or graphics) and no way of stopping the machine except by removing
the power cable and battery - the power button does not work either).

Any ideas how to work around so that I can start a window manager ?
Thank & Regards, Jason

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