[Bug 111612] [CI][DRMTIP] igt at prime_busy@hang-blt - incomplete - kernel BUG at drivers/dma-buf/dma-buf.c:99!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111612

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 9b495a5887994a6d74d5c261d012083a92b94738
Author: Maarten Lankhorst <maarten.lankhorst at canonical.com>
Date:   Tue Jul 1 12:57:43 2014 +0200

    dma-buf: add poll support, v3
...
@@ -52,6 +53,16 @@ static int dma_buf_release(struct inode *inode, struct file
*
file)

        BUG_ON(dmabuf->vmapping_counter);

+       /*
+        * Any fences that a dma-buf poll can wait on should be signaled
+        * before releasing dma-buf. This is the responsibility of each
+        * driver that uses the reservation objects.
+        *
+        * If you hit this BUG() it means someone dropped their ref to the
+        * dma-buf while still having pending operation to the buffer.
+        */
+       BUG_ON(dmabuf->cb_shared.active || dmabuf->cb_excl.active);

which is quite odd as the exported dmabuf has no bearing on the native object
and its fences.

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