login: [ 148.2555320] panic: kernel diagnostic assertion "RB_FATHER(old_child) == old_father" failed: file "/usr/branches/riastradh-drm/netbsd-src/sys/lib/libkern/../../../common/lib/libc/gen/rb.c", line 340 
[ 148.2755391] cpu1: Begin traceback...
[ 148.2855425] vpanic() at netbsd:vpanic+0x178
[ 148.2855425] kern_assert() at netbsd:kern_assert+0x48
[ 148.2955459] rb_tree_reparent_nodes.isra.0() at netbsd:rb_tree_reparent_nodes.isra.0+0x149
[ 148.2955459] drm_vma_offset_remove() at netbsd:drm_vma_offset_remove+0x2c
[ 148.3055507] ttm_bo_release() at netbsd:ttm_bo_release+0x80
[ 148.3155527] ttm_bo_move_accel_cleanup() at netbsd:ttm_bo_move_accel_cleanup+0x1a0
[ 148.3255564] radeon_move_blit.constprop.9() at netbsd:radeon_move_blit.constprop.9+0xdb
[ 148.3255564] radeon_bo_move() at netbsd:radeon_bo_move+0xd8
[ 148.3355606] ttm_bo_handle_move_mem() at netbsd:ttm_bo_handle_move_mem+0x163
[ 148.3455633] ttm_bo_validate() at netbsd:ttm_bo_validate+0x157
[ 148.3455633] radeon_bo_list_validate() at netbsd:radeon_bo_list_validate+0x178
[ 148.3555671] radeon_cs_ioctl() at netbsd:radeon_cs_ioctl+0x9a1
[ 148.3655701] drm_ioctl() at netbsd:drm_ioctl+0x23c
[ 148.3655701] drm_ioctl_shim() at netbsd:drm_ioctl_shim+0x48
[ 148.3755748] sys_ioctl() at netbsd:sys_ioctl+0x59c
[ 148.3755748] syscall() at netbsd:syscall+0x299
[ 148.3855775] --- syscall (number 54) ---