drm/ttm assert

[coypu%sdf.org@localhost]

Hi folks,

I don't have the time/energy to tackle this now,
in case anyone needs a data point (I haven't seen similar complaints)

2017-12-9 kernel, starting p Xorg/firefox. No heavy use.

panic: kernel diagnostic assertion "!ISSET(ttm->page_flags, TTM_PAGE_FLAG_SWAPPED)" failed: file "/usr/src/sys/external/bsd/drm2/dist/drm/ttm/t
tm_tt.c", line 418
ttm_tt_unwire() at netbsd:ttm_tt_unwire+0xc5
ttm_bus_dma_populate() at netbsd:ttm_bus_dma_populate+0x14f
ttm_tt_bind() at netbsd:ttm_tt_bind+0x26
ttm_bo_handle_move_mem() at netbsd:ttm_bo_handle_move_mem+0x61a
ttm_bo_validate() at netbsd:ttm_bo_validate+0x238
ttm_bo_init() at netbsd:ttm_bo_init+0x213
nouveau_bo_new() at netbsd:nouveau_bo_new+0x200
nouveau_gem_new() at netbsd:nouveau_gem_new+0x53
nouveau_gem_ioctl_new() at netbsd:nouveau_gem_ioctl_new+0x9d
drm_ioctl() at netbsd:drm_ioctl+0x11e
sys_ioctl() at netbsd:sys_ioctl+0x101
yscall() at netbsd:syscall+0x1d8
--- syscall (number 54) ---