DEBUG_LOCKS_WARN_ON(sem->owner != ((struct task_struct *)(1UL << 0)))

[felix.kuehling@xxxxxxx (Felix Kuehling)]

[+Pan Xinhui]

On 2018-07-12 03:16 AM, Michel Dänzer wrote:
> On 2018-07-12 02:43 AM, Felix Kuehling wrote:
>> Kent just caught a similar backtrace in one of our KFD pre-submission
>> tests (see below)
> Yeah, looks the same.
>
>
>> Neither KFD nor AMDGPU are implied in the backtrace. Is this a
>> regression in the kernel itself? amd-kfd-staging is currently based on
>> 4.18-rc1.
> FWIW, I saw this with 4.17 based kernels already, and I didn't have
> CONFIG_DEBUG_RWSEMS enabled with older kernels, so I'm not sure it's a
> (recent) regression.

I've now also seen it on Oded's branch (4.17-rc5). It is reproduced
reliably by a new test that Pan Xinhui just added to our kfdtest
(KFDMemoryTest.MMapLarge).

Regards,
  Felix