From: rjwysocki(a)gmail.com [mailto:[email protected]] On Behalf Of Rafael J. Wysocki Subject: Re: 4.9-rc1: [TMP_] ACPI namespace lookup failure, AE_ALREADY_EXISTS On Thu, Oct 20, 2016 at 8:44 PM, Zheng, Lv <lv.zheng(a)intel.com&gt; wrote: > Hi, > >> From: Deak, Imre >> Subject: 4.9-rc1: [TMP_] ACPI namespace lookup failure, AE_ALREADY_EXISTS >> >> Hi, >> >> after upgrading to 4.9-rc1 I get the following errors occasionally >> during boot and suspend-to-ram on an APL system: >> >> [ 59.513434] ACPI Error: [TMP_] Namespace lookup failure, AE_ALREADY_EXISTS (20160831/dswload2- 330) >> [ 59.513446] ACPI Exception: AE_ALREADY_EXISTS, During name lookup/catalog (20160831/psobject-227) >> [ 59.513469] ACPI Error: Method parse/execution failed [\_SB.PCI0.SCPG] (Node ffff8802770b7bb8), >> AE_ALREADY_EXISTS (20160831/psparse-543) >> [ 59.515415] ACPI Error: Method parse/execution failed [\_SB.PCI0.SDHA._PS3] (Node ffff8802770b7dc0), >> AE_ALREADY_EXISTS (20160831/psparse-543) >> [ 59.517118] ACPI: Marking method _PS3 as Serialized because of AE_ALREADY_EXISTS error >> >> Other than these error messages, booting and suspend/resume seems to work ok. >> Bisecting points to >> commit 74f51b80a0c4ff84fbeb7f12ea43ce66934d29aa >> Author: Lv Zheng <lv.zheng(a)intel.com&gt; >> Date: Wed Sep 7 14:07:10 2016 +0800 >> >> ACPICA: Namespace: Fix dynamic table loading issues >> >> Reverting this on top of 4.9-rc1 gets rid of the error messages. > > The commit in question only modified code to make locks unlocked/locked. > Which should be transparent to the functional stuffs. It might change the relative timing of thigs (which might result in ordering changes).

> I'm not sure how it can lead to such error in the single-threading boot environment. Why do you think it's single-threaded? At least suspend/resume isn't in general.