Hi Christian,
Are you adding new traces or turning on existing ones? Would you like
me to try them out in my setup?
Tom
On 2018-09-10 8:49 a.m., Christian König wrote:
Am 10.09.2018 um 14:05 schrieb Huang Rui:
On Mon, Sep 10, 2018 at 05:25:48PM +0800, Koenig, Christian wrote:
Am 10.09.2018 um 11:23 schrieb Huang Rui:
On Mon, Sep 10, 2018 at 11:00:04AM +0200, Christian König wrote:
Hi Ray,
well those patches doesn't make sense, the pointer is only local to
the function.
You're right.
I narrowed it with gdb dump from ttm_bo_bulk_move_lru_tail+0x2b, the
use-after-free should be in below codes:
man = &bulk->tt[i].first->bdev->man[TTM_PL_TT];
ttm_bo_bulk_move_helper(&bulk->tt[i], &man->lru[i], false);
Is there a case, when orignal bo is destroyed in the bulk pos, but it
doesn't update pos->first pointer, then we still use it during the bulk
moving?
Only when a per VM BO is freed or the VM destroyed.
The first case should now be handled by "drm/amdgpu: set bulk_moveable
to false when a per VM is released" and when we use a destroyed VM we
would see other problems as well.
If a VM instance is teared down, all BOs which belong that VM should be
removed from LRU. But how can we submit cmd based on a destroyed VM? You
know, we do the bulk move at last step of submission.
Well exactly that's the point this can't happen :)
Otherwise we would crash because of using freed up memory much earlier
in the command submission.
The best idea I have to track this down further is to add some
trace_printk in ttm_bo_bulk_move_helper and amdgpu_bo_destroy and see
why and when we are actually using a destroyed BO.
Christian.
Thanks,
Ray
BTW: Just pushed this commit to the repository, should show up any
second.
Christian.
Thanks,
Ray
Regards,
Christian.
Am 10.09.2018 um 10:57 schrieb Huang Rui:
It avoids to be refered again after freed.
Signed-off-by: Huang Rui <ray.hu...@amd.com>
Cc: Christian König <christian.koe...@amd.com>
Cc: Tom StDenis <tom.stde...@amd.com>
---
drivers/gpu/drm/ttm/ttm_bo.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
b/drivers/gpu/drm/ttm/ttm_bo.c
index 138c989..d3ef5f8 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -54,6 +54,7 @@ static struct attribute ttm_bo_count = {
static void ttm_bo_default_destroy(struct ttm_buffer_object *bo)
{
kfree(bo);
+ bo = NULL;
}
static inline int ttm_mem_type_from_place(const struct
ttm_place *place,
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