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SubjectRe: 4.18rc3 TX2 boot failure with "ACPICA: AML parser: attempt to continue loading table after error"
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Hi,

On 07/09/2018 04:28 PM, Rafael J. Wysocki wrote:
> On Mon, Jul 9, 2018 at 10:45 PM, Jeremy Linton <jeremy.linton@arm.com> wrote:
>> Hi,
>>
>> First thanks for the patch..
>>
>> On 07/08/2018 04:14 AM, Rafael J. Wysocki wrote:
>>>
>>> On Monday, July 2, 2018 11:41:42 PM CEST Jeremy Linton wrote:
>>>>
>>>> Hi,
>>>>
>>>> I'm experiencing two problems with commit 5088814a6e931 which is
>>>> "ACPICA: AML parser: attempt to continue loading table after error"
>>>>
>>>> The first is this boot failure on a thunderX2:
>>>>
>>>> [ 10.770098] ACPI Error: Ignore error and continue table load
>>
>>
>> [trimming]
>>
>>>> ]---
>>>>
>>>> Which does appear to be the result of some bad data in the table, but it
>>>> was working with 4.17, and reverting this commit solves the problem.
>>>
>>>
>>> Does the patch below make any difference?
>>>
>>> ---
>>> drivers/acpi/acpica/psobject.c | 3 +++
>>> 1 file changed, 3 insertions(+)
>>>
>>> Index: linux-pm/drivers/acpi/acpica/psobject.c
>>> ===================================================================
>>> --- linux-pm.orig/drivers/acpi/acpica/psobject.c
>>> +++ linux-pm/drivers/acpi/acpica/psobject.c
>>> @@ -39,6 +39,9 @@ static acpi_status acpi_ps_get_aml_opcod
>>> ACPI_FUNCTION_TRACE_PTR(ps_get_aml_opcode, walk_state);
>>> walk_state->aml = walk_state->parser_state.aml;
>>> + if (!walk_state->aml)
>>> + return AE_CTRL_PARSE_CONTINUE;
>>> +
>>
>>
>> Well this seems to avoid the crash, but now it hangs right after on the
>> "Ignore error and continue table load" message.
>
> Well, maybe we should just abort in that case.
>
> I'm wondering what happens if you replace the return statement in the
> patch above with
>
> return_ACPI_STATUS(AE_AML_BAD_OPCODE)

Yes, that is where I went when I applied the patch but I used
AE_CTRL_TERMINATE, which terminates the loop in acpi_ps_parse_loop() and
that appears to successfully finish/terminate the initial parsing pass.
But, it then crashes in acpi_ns_lookup called via the
acpi_walk_resources sequences that goes through ut_evalute_object() due
to the path/scope_info->scope.node being ACPI_ROOT_OBJECT (-1) and
bypassing the null check. Adding a ACPI_ROOT_OBJECT check as well as the
null checks in acpi_ns_lookup results in a successful boot. Tracking
down how the terminate (or whatever) is leaving the info->prefix_node
(in acpi_ns_evaluate) set to ROOT_OBJECT instead of null, is something I
don't yet understand.

Anyway, I tried Using BAD_OPCODE rather than TERMINATE and it seems to
have the same basic result as PARSE_CONTINUE.


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