[Bug 78992] [regression] DRI2 races

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78992

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEEDINFO

--- Comment #43 from Chris Wilson <chris at chris-wilson.co.uk> ---
I still haven't hit this myself yet. With the GetBuffers() assert that the back
buffer we hand back is not on the scanout, I can be reasonably certain that the
error is not that.

Two things can I ask you to double check:

1. That 

diff --git a/src/sna/sna_dri2.c b/src/sna/sna_dri2.c
index ac73680..daf1d08 100644
--- a/src/sna/sna_dri2.c
+++ b/src/sna/sna_dri2.c
@@ -211,7 +211,7 @@ sna_dri2_window_get_chain(WindowPtr win)
 #error DRI2 version supported by the Xserver is too old
 #endif

-#if DRI2INFOREC_VERSION < 6
+#if DRI2INFOREC_VERSION < 6 || 1
 #define XORG_CAN_TRIPLE_BUFFER 0
 #define swap_limit(d, l) false
 #else

still restores the old behaviour, and

2. whether

diff --git a/src/sna/sna_dri2.c b/src/sna/sna_dri2.c
index 78c4069..ac73680 100644
--- a/src/sna/sna_dri2.c
+++ b/src/sna/sna_dri2.c
@@ -898,6 +898,8 @@ __sna_dri2_copy_region(struct sna *sna, DrawablePtr draw,
RegionPtr region,
                if (priv)
                        src_bo = priv->gpu_bo;
        }
+       if (src_bo != src_priv->bo)
+               ErrorF("applying stale buffer fixup to Window source!\n");

        dst_bo = dst_priv->bo;
        if (dst->attachment == DRI2BufferFrontLeft) {
@@ -916,6 +918,9 @@ __sna_dri2_copy_region(struct sna *sna, DrawablePtr draw,
RegionPtr region,
        } else
                sync = false;

+       if (dst_bo != dst_priv->bo)
+               ErrorF("applying stale buffer fixup to Window destination!\n");
+
        if (!wedged(sna)) {
                xf86CrtcPtr crtc;


issues any warnings when you see the errors?

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