linux-kernel - RE: Regression, bisected: hyperv shutdown panics guest

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Date:	Thu, 7 Feb 2013 12:43:27 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Florian Westphal <fw@...len.de>, Feng Hong <hongfeng@...vell.com>
CC:	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: Regression, bisected: hyperv shutdown panics guest



> -----Original Message-----
> From: Florian Westphal [mailto:fw@...len.de]
> Sent: Thursday, February 07, 2013 5:54 AM
> To: Feng Hong
> Cc: ebiederm@...ssion.com; Kees Cook; linux-kernel@...r.kernel.org; KY
> Srinivasan; Haiyang Zhang
> Subject: Regression, bisected: hyperv shutdown panics guest
> 
> With 3.7, hyperv guest shutdown no longer works.
> Instead, guest kernel throws a bunch of "BUG: scheduling-while-atomic"
> errors and then dies.
> 
> reverting
> 
> commit 6c0c0d4d1080840eabb3d055d2fd81911111c5fd
> Author: hongfeng <hongfeng@...vell.com>
> Date:   Thu Oct 4 17:12:25 2012 -0700
> poweroff: fix bug in orderly_poweroff()
> 
> fixes this problem.
> 
> Greping for users of orderly_poweroff() shows that hyperv isn't
> the only caller that invokes the function from irq context.
> 
> In fact, kdoc for orderly_poweroff says:
> 
> * This may be called from any context to trigger a system shutdown.
> * If the orderly shutdown fails, it will force an immediate shutdown.
> 
> Any suggestions on how to properly fix this?
> 
> Thanks,
> Florian
> 

A patch has been submitted to fix this problem. It is in Greg's queue:
Subject: Re: [PATCH 6/6] Drivers: hv: Execute shutdown in a thread context


Regards,

K. Y

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