linux-kernel - Re: INFO: possible circular locking dependency

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Date:	Tue, 25 Aug 2009 22:33:30 +0200
From:	Zdenek Kabelac <zdenek.kabelac@...il.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com, linux-acpi@...r.kernel.org,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: INFO: possible circular locking dependency - kacpid 
	acpi_os_wait_events_complete

2009/8/25 Bjorn Helgaas <bjorn.helgaas@...com>:
> On Tuesday 25 August 2009 02:10:58 am Zdenek Kabelac wrote:
>> Now with 2.6.31-rc7 (3edf2fb9d80a46d6c32ba12547a42419845b4b76)
>>  I'm getting this  INFO trace - also I've noticed complete reset during resume
>> which could be eventually related to this ?
>
> What's the most recent kernel where this did not occur?  Is this
> a regression since 2.6.30?
>
>> My machine - T61, 4GB, C2D
>> I suspect that some resent  thinkpad-acpi changes.
>
> Do you have any evidence that points to thinkpad_acpi?  I looked
> at the recent changes there, and I don't see anything obviously
> related to kacpid or deferred work.
>

Well I've never seen this INFO trace before - also I'm not sure I
could reliable retest it - might be coincidence of suspend out of port
replicator and resume while being attached on it - however I do this
relatively often and I start to see this after I' started to use -rc7
kernel.

My guess is purely based on the fact that commit touching functions
from INFO trace was recently merged to main tree.

If there will be some time I could try to make few tests for suspend
resume - but I hope the trace would be enough for analysis.

Zdenek
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