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SubjectRe: 4.18rc3 TX2 boot failure with "ACPICA: AML parser: attempt to continue loading table after error"
On Tue, Jul 3, 2018 at 12:30 AM, Jeremy Linton <jeremy.linton@arm.com> wrote:
> Hi,
>
> On 07/02/2018 04:52 PM, Rafael J. Wysocki wrote:
>>
>> On Mon, Jul 2, 2018 at 11:41 PM, Jeremy Linton <jeremy.linton@arm.com>
>> 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
>>> (20180531/psobject-604)
>>> [ 10.777926] Unable to handle kernel NULL pointer dereference at
>>> [ 10.950199] Call trace:
>>>
>>> [ 10.952663] acpi_ps_peek_opcode+0x1c/0x40
>>> [ 10.956797] acpi_ps_create_op+0x54/0x278
>>> [ 10.960842] acpi_ps_parse_loop+0x1b4/0x6c8
>>> [ 10.965063] acpi_ps_parse_aml+0xe0/0x2b4
>>> [ 10.969108] acpi_ps_execute_table+0xa0/0x104
>>> [ 10.973505] acpi_ns_execute_table+0x120/0x194
>>> [ 10.977989] acpi_ns_parse_table+0x34/0x68
>>> [ 10.982122] acpi_ns_load_table+0x4c/0xbc
>>> [ 10.986169] acpi_tb_load_namespace+0x1d4/0x240
>>> [ 10.990744] acpi_load_tables+0x50/0xbc
>>> [ 10.994614] acpi_init+0xb8/0x374
>>> [ 10.997959] do_one_initcall+0x54/0x208
>>> [ 11.001829] kernel_init_freeable+0x224/0x300
>>> [ 11.006229] kernel_init+0x18/0x118
>>> [ 11.009747] ret_from_fork+0x10/0x18
>>> [ 11.013354] Code: aa0003f3 aa1e03e0 d503201f f9400661 (39400020)
>>> [ 11.019535] ---[ end trace 2bd8068593cf8acc ]---
>>> [ 11.024195] Kernel panic - not syncing: Fatal exception
>>> [ 11.029488] SMP: stopping secondary CPUs
>>> [ 11.033480] ---[ end Kernel panic - not syncing: Fatal exception
>>> ]---
>>>
>>> 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.
>>
>>
>> But this commit fixes another regression which was more widespread.
>>
>> Apparently, we can't work around all of the errors in the tables out
>> there at the same time. :-/
>
>
> NP, Let me see if I can come up with a way to harden the
> parse_loop/create_op code enough that it doesn't crash the machine.

Sure. I'll look at it too.

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