https://bugs.freedesktop.org/show_bug.cgi?id=99631

--- Comment #1 from Ilia Mirkin <[email protected]> ---
The issue appears that the right buffer object isn't mapped. The fact that the
ARRAY_BUFFER is modified doesn't appear to make it into the actx->NewState bit.
The following "fixes" the trace:

diff --git a/src/mesa/main/api_arrayelt.c b/src/mesa/main/api_arrayelt.c
index 46175e4..fa78edb 100644
--- a/src/mesa/main/api_arrayelt.c
+++ b/src/mesa/main/api_arrayelt.c
@@ -1707,7 +1707,7 @@ _ae_map_vbos(struct gl_context *ctx)
    if (actx->mapped_vbos)
       return;

-   if (actx->NewState)
+   if (actx->NewState || 1)
       _ae_update_state(ctx);

    for (i = 0; i < actx->nr_vbos; i++)

Now just need to figure out where NewState is not being updated when it should
be.

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