linux-kernel - Re: [GIT PULL] More ACPI updates for v4.10-rc1

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Date:   Thu, 5 Jan 2017 01:07:03 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Lv Zheng <lv.zheng@...el.com>,
        Bob Moore <robert.moore@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [GIT PULL] More ACPI updates for v4.10-rc1

On Thu, Jan 5, 2017 at 12:46 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Wed, Jan 4, 2017 at 3:19 PM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> This is my normal desktop, so pretty plain HW.
>>
>> It doesn't happen on my laptop, so it's obviously hw-related or
>> possibly config-related.
>
> .. and here's the stack trace.

Thanks!

I reproduced it too in the meantime (but on an older system I rarely use).

> Side note: should the '\n' be deleted? ACPI_ERROR() seems to add that
> silly "where it happened" at the end, but due to the '\n' we end up
> with two lines...
>
>                   Linus
>
> ---
>
>   ACPI Warning: Table ffffffffb0e6c0a0, Validation count is zero
> before decrement
>    (20160930/tbutils-456)
>   ------------[ cut here ]------------
>   WARNING: CPU: 0 PID: 0 at drivers/acpi/acpica/tbutils.c:457
> acpi_tb_put_table+0x4e/0x62
>   Modules linked in:
>   CPU: 0 PID: 0 Comm: swapper Not tainted
> 4.10.0-rc2-00103-g4cf184638bcf-dirty #1
>   Hardware name: System manufacturer System Product Name/Z170-K, BIOS
> 1803 05/06/2016
>   Call Trace:
>      acpi_tb_put_table+0x4e/0x62
>      acpi_put_table+0x40/0x4d
>      detect_intel_iommu+0x9d/0xed
>      pci_iommu_alloc+0x50/0x6c
>      mem_init+0xf/0x8a
>      start_kernel+0x21e/0x454
>      x86_64_start_reservations+0x24/0x26
>      x86_64_start_kernel+0x182/0x193
>      start_cpu+0x14/0x14
>     ---[ end trace 5e897a808e950ddc ]---

And the attached thing makes it go away for me.

I'll post a proper patch shorlty.

Cheers,
Rafael

View attachment "acpi-table-put-debug.patch" of type "text/x-patch" (563 bytes)