kernel BUG at drivers/gpu/drm//ttm/ttm_bo.c:196!

[Michel Dänzer]

On 2019-03-12 3:26 p.m., Koenig, Christian wrote:
> Am 12.03.19 um 14:47 schrieb Michel Dänzer:
>> On 2019-02-05 6:40 p.m., Michel Dänzer wrote:
>>> FWIW, I've hit this twice now today, whereas I don't remember ever
>>> hitting it before (not 100% sure though).
>>>
>>> I reverted the remaining hunk of the "cleanup setting bulk_movable"
>>> change, and it survived a piglit run. Could just be luck, though...
>> I'd been running with that revert for the last month without hitting the
>> problem. Today I tried without the revert, and promptly hit it again.
>> Seems more than just luck.
> 
> Mhm, and the only thing you reverted was the "cleanup setting 
> bulkmovable" change?

Yes, specifically, the only hunk of that which hasn't been reverted yet:

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index a45ca5d2cfe9..c25b06121e8e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -693,6 +693,8 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
        struct amdgpu_vm_bo_base *bo_base, *tmp;
        int r = 0;

+       vm->bulk_moveable &= list_empty(&vm->evicted);
+
        list_for_each_entry_safe(bo_base, tmp, &vm->evicted, vm_status) {
                struct amdgpu_bo *bo = bo_base->bo;


-- 
Earthling Michel Dänzer               |              https://www.amd.com
Libre software enthusiast             |             Mesa and X developer