I noticed just now I didn't touch on this message:
Code:
intel drm0: gpu hung !
DRM refers to
Direct Rendering Manager. A GPU is a
Graphical Processing Unit. I assume that this message was produced by the intel(4) driver, or perhaps the drm(4) driver. As noted below, I don't have access to the source code at the moment to check.
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As additional information, the "i915" referenced in the page fault trap panic message refers to an Intel Graphics Media Accelerator (GMA) family of chipsets used in embedded video on motherboards.
The "i915_gem_evict_inactive" is a symbol within driver source code. Googling just for that I discovered that there is a common
page fault trap of doom produced by the Intel video drivers.
I don't have access to source code at the moment to be able to direct you to the specific module; download a 5.1-release tarball from <your local mirror>/pub/OpenBSD/5.1/xenocara.tar.gz if you are interested.