lkml.org 
[lkml]   [2018]   [Jul]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: 4.18rc3 TX2 boot failure with "ACPICA: AML parser: attempt to continue loading table after error"
From
Date
Hi,

On 07/10/2018 06:25 AM, Rafael J. Wysocki wrote:
> On Tuesday, July 10, 2018 1:13:17 PM CEST Rafael J. Wysocki wrote:
>> On Tuesday, July 10, 2018 5:44:05 AM CEST Jeremy Linton wrote:
>>> 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.
>>
>> OK, thanks!
>>
>> I evidently didn't look deep enough.
>>
>> Can you please check the patch below?
>>
>> I'm not sure if we can pass this broken state to
>> acpi_ps_complete_final_op(), so it may be necessary to return
>> an error directly when aml_op_start is NULL.
>>
>> ---
>> drivers/acpi/acpica/psloop.c | 3 +++
>> 1 file changed, 3 insertions(+)
>>
>> Index: linux-pm/drivers/acpi/acpica/psloop.c
>> ===================================================================
>> --- linux-pm.orig/drivers/acpi/acpica/psloop.c
>> +++ linux-pm/drivers/acpi/acpica/psloop.c
>> @@ -493,6 +493,9 @@ acpi_status acpi_ps_parse_loop(struct ac
>> ASL_CV_CAPTURE_COMMENTS(walk_state);
>>
>> aml_op_start = parser_state->aml;
>> + if (!aml_op_start)
>> + break;
>> +
>> if (!op) {
>> status =
>> acpi_ps_create_op(walk_state, aml_op_start, &op);
>>
>> --
>
> So maybe something like this:
>
> ---
> drivers/acpi/acpica/psloop.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> Index: linux-pm/drivers/acpi/acpica/psloop.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/acpica/psloop.c
> +++ linux-pm/drivers/acpi/acpica/psloop.c
> @@ -494,6 +494,9 @@ acpi_status acpi_ps_parse_loop(struct ac
>
> aml_op_start = parser_state->aml;
> if (!op) {
> + if (!aml_op_start)
> + return_ACPI_STATUS(AE_AML_INTERNAL);
> +
> status =
> acpi_ps_create_op(walk_state, aml_op_start, &op);
> if (ACPI_FAILURE(status)) {
>
>

This gets rid of the infinite loop, but its still has the problem with
acpi_ns_lookup crashing due to -1 in the scope.node.

\
 
 \ /
  Last update: 2018-07-10 17:04    [W:0.154 / U:0.852 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site