The dmesg output from a failure is:
[ 427.521907] [drm:drm_ioctl] pid=776, dev=0xe200, auth=1,
I915_GEM_THROTTLE
[ 427.533899] [drm:drm_ioctl] pid=2340, dev=0xe200, auth=1,
I915_GEM_MADVISE
[ 427.533905] [drm:drm_ioctl] pid=2340, dev=0xe200, auth=1, I915_GEM_PWRITE
[ 427.533916] [drm:drm_ioctl] pid=2340, dev=0xe200, auth=1,
I915_GEM_USERPTR
[ 427.533939] [drm:drm_ioctl] ret = -22
[ 427.533950] [drm:drm_ioctl] pid=2340, dev=0xe200, auth=1,
I915_GEM_USERPTR
[ 427.533952] [drm:drm_ioctl] ret = -1
[ 427.536096] [drm:drm_ioctl] pid=776, dev=0xe200, auth=1,
I915_GEM_THROTTLE
[ 427.538128] [drm:drm_calc_vbltimestamp_from_scanoutpos] crtc 0 : v 7
p(0,-22)@ 427.251356 -> 427.251820 [e 0 us, 0 rep]
I haven't specifically checked for running out of memory but it seems
unlikely: in repeated runs the first is the most likely to fail, and it
doesn't cause system hangs/slowdowns.
The Debian experimental kernel (3.18) doesn't appear to have this
problem, so it may well be a kernel bug that has already been fixed.
Both it and the 3.16 kernel have a different intermittent failure I have
yet to investigate:
compiler_fill_image_1d_array() [FAILED]
Error: dst[j*w + i] == 0
at file
/home/rnpalmer/Debian/builds/stackbuild/beignet/utests/compiler_fill_image_1d_array.cpp,
function compiler_fill_image_1d_array, line 63
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