30 Nov
2021
30 Nov
'21
12:42 p.m.
Am 30.11.21 um 13:31 schrieb Thomas Hellström:
[SNIP]
Other than that, I didn't investigate the nesting fails enough to say I can accurately review this. :)
Basically the problem is that within enable_signaling() which is called with the dma_fence lock held, we take the dma_fence lock of another fence. If that other fence is a dma_fence_array, or a dma_fence_chain which in turn tries to lock a dma_fence_array we hit a splat.
Yeah, I already thought that you constructed something like that.
You get the splat because what you do here is illegal, you can't mix dma_fence_array and dma_fence_chain like this or you can end up in a stack corruption.
Regards, Christian.
But I'll update the commit message with a typical splat.
/Thomas