i915_gem panic

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

Just saw on a 4 Dec GENERIC current/amd64:

System panicked: kernel diagnostic assertion "!(obj->base.write_domain & ~(0x00000002 | 0x00000004 | 0x00000008 | 0x00000010 | 0x00000020))" failed: file "../../../../external/bsd/drm2/dist/drm/i915/i915_gem.c", line 2854 
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NARCNET() at 0
?() at fffffe8043abb010
vpanic() at vpanic+0x145
kern_assert() at kern_assert+0x4f
i915_gem_object_move_to_inactive() at i915_gem_object_move_to_inactive+0x207
i915_gem_retire_requests_ring() at i915_gem_retire_requests_ring+0x64
i915_gem_busy_ioctl() at i915_gem_busy_ioctl+0xe8
drm_ioctl() at drm_ioctl+0x122
sys_ioctl() at sys_ioctl+0x17e
syscall() at syscall+0x9a


Cheers,

Patrick